All posts by 龙生
MongoDB服务的启动和卸载及路径修改
安装：mongod --dbpath "C:\mongodb\db" --logpath "C:\mongodb\log.txt" --install --serviceName "MongoDB" 卸载：mongod.exe --remove --serviceName "MongoDB" 服务 错误 1053 您可以编辑在注册表中的可执行文件的路径，通过改变在以下关键的ImagePath HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MongoDB\ImagePath 数值数据位 "D:\xampp\mongodb\bin\mongod.exe" --bind_ip 127.0.0.1 --logpath "d:\xampp\mongodb\dblog" --logappend --dbpath "d:\xampp\mongodb\data" --directoryperdb --serviceName MongoDB --service
View Details人民日报：靠房地产救经济是饮鸩止渴
在二季度GDP增速跌破8%后，呼唤楼市调控政策放松的声音不绝于耳。 对此，大多数专家认为，房地产调控政策绝不能放松，要谨防房地产借机要挟中国经济。只有转变经济增长方式、调整经济结构才是中国经济长期可持续发展的正确道路，仍然走依靠房地产带动经济增长的老路无疑是饮鸩止渴。 调控既不加码也未放松 国家统计局新闻发言人盛来运认为，房地产调控是今年经济增长速度下滑的重要原因，房地产投资增速回落以及与房地产销售有关的家具和家电销售情况，都不可避免地在一定程度上影响短期经济增长。 在当前经济增速放缓的背景下，房地产调控已经处于关键时期。近日，一则关于“珠海楼市取消限购令限价令”的消息在网络上广泛流传。虽然珠海相关部门已进行否认，但也不难看出，目前有些限购城市已经按捺不住给楼市调控松绑的冲动。 住房城乡建设部新闻发言人近日强调，将继续坚持调控政策不动摇，对于地方出台放松抑制不合理购房政策的，将及时予以制止或纠正。对此，中国房地产学会副会长陈国强表示，住建部此次表态释放出一个重要信号，即重申楼市调控政策“既不加码，也未放松”的基调。而且限购和限贷政策“红线”被再次明确，将成为地方政府微调政策重要约束条款。 放松调控后果很严重 专家普遍认为，房地产调控政策松绑从短期看可能会对经济产生刺激作用，但从长期来看，这无异于是饮鸩止渴，将使受到挤压的房地产泡沫沉渣泛起，危害中国经济的健康发展。 中国社会科学院金融研究所研究员易宪容表示，在当前经济转型的关键时刻，政府首先必须彻底舍弃通过住房市场投机炒作短期内推高GDP增长的幻想。要在挤出巨大房地产泡沫同时，建立起稳定经济增长扩大内需的长效机制。这种长效机制最为核心的内容，就是让住房价格回归到合理水平。 “如果再次启动刺激性的财政政策，只会导致更多的过剩产能，而银根的放松则会再度推高刚刚控制下来的通货膨胀。”亚太城市房地产研究院院长谢逸枫表示，大规模的经济刺激计划不会再出台，今年下半年中央以维持“既有政策”作为楼市调控思路。房产调控政策微调应该在去投资投机化的同时，保刚需与改善置业人群的合理购买需求，达到拉动销售成交，推动投资增长的目的。据《人民日报海外版》 转自：http://finance.ifeng.com/stock/tzcl/20120719/6783635.shtml
View Detailswpf 操作richtextbox
取出richTextBox里面的内容第一种方法：将richTextBox的内容以字符串的形式取出string xw = System.Windows.Markup.XamlWriter.Save(richTextBox.Document);第二种方法：将richTextBox的类容以二进制数据的方法取出FlowDocument document = richTextBox.Document;System.IO.Stream s = new System.IO.MemoryStream(); System.Windows.Markup.XamlWriter.Save(document, s); byte[] data = new byte[s.Length];s.Position = 0;s.Read(data, 0, data.Length);s.Close(); 赋值给richTextBox 第一种方法：将字符串转换为数据流赋值给richTextBox中 System.IO.StringReader sr = new System.IO.StringReader(xw);System.Xml.XmlReader xr = System.Xml.XmlReader.Create(sr);richTextBox1.Document = (FlowDocument)System.Windows.Markup.XamlReader.Load(xr);第二种方法：将二进制数据赋值给richTextBoxSystem.IO.Stream ss = new System.IO.MemoryStream(data);FlowDocument doc = System.Windows.Markup.XamlReader.Load(ss) as FlowDocument;ss.Close();richTextBox1.Document = doc; 清空RichTextBox的方法 System.Windows.Documents.FlowDocument doc = richTextBox.Document;doc.Blocks.Clear(); 如何将一个String类型的字符串赋值给richTextBoxmyRTB.Document = new FlowDocument(new Paragraph(new Run(myString))); FlowDocument doc = new FlowDocument();Paragraph p = new Paragraph(); // Paragraph 类似于 html 的 P 标签Run r = new Run(myString); // Run 是一个 Inline 的标签p.Inlines.Add(r);doc.Blocks.Add(p);myRTB.Document = […]
View Details详解WPF 4 DataGrid控件的基本功能
给大家讲到WPF,我们就不得不提到WinForm，51CTO之前也报导过《WPF与WinForm对比谈 多线程编程优化是关键》的技术文章，对于他们之间的优劣有了更深刻的认识。而今天我们要讲到的是WPF 4中的DataGrid空间。我们也诚挚向您推荐《让你的代码“炫”起来——WPF开发教程》。 提到DataGrid 不管是网页还是应用程序开发都会频繁使用。通过它我们可以灵活的在行与列间显示各种数据。本篇将详细介绍WPF 4 中DataGrid 的相关功能。 自定义列 默认情况下，当我们为DataGrid 控件设置ItemSource 属性后，DataGrid 会根据数据类型自动生成相应的列，下表列出DataGrid 支持的四种列及其数据类型。 在创建DataGrid 时可以通过AutoGenerateColumns 属性设置列是否自动生成，从而加入自定义列。如果DataGrid 中同时包含“自动生成列”与“用户自定义列”，则首先创建“用户自定义列”。下面代码实例中分别创建这四种列：
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<ol class="dp-xml"><li class="alt"><span><span class="tag"><</span><span class="tag-name">Window</span><span> </span><span class="attribute">x:Class</span><span>=</span><span class="attribute-value">"WPF4ControlTest.MainWindow"</span><span> </span></span></li><li><span> </span><span class="attribute">xmlns</span><span>=</span><span class="attribute-value">"http://schemas.microsoft.com/winfx/2006/xaml/presentation"</span><span> </span></li><li class="alt"><span> </span><span class="attribute">xmlns:x</span><span>=</span><span class="attribute-value">"http://schemas.microsoft.com/winfx/2006/xaml"</span><span> </span></li><li><span> </span><span class="attribute">xmlns:local</span><span>=</span><span class="attribute-value">"clr-namespace:WPF4ControlTest"</span><span> </span></li><li class="alt"><span> </span><span class="attribute">xmlns:assembly</span><span>=</span><span class="attribute-value">"clr-namespace:System;assembly=mscorlib"</span><span> </span></li><li><span> </span><span class="attribute">Title</span><span>=</span><span class="attribute-value">"MainWindow"</span><span> </span><span class="attribute">Height</span><span>=</span><span class="attribute-value">"200"</span><span> </span><span class="attribute">Width</span><span>=</span><span class="attribute-value">"500"</span><span class="tag">></span><span> </span></li><li class="alt"><span> </span><span class="tag"><</span><span class="tag-name">Window.Resources</span><span class="tag">></span><span> </span></li><li><span> </span><span class="tag"><</span><span class="tag-name">ObjectDataProvider</span><span> </span><span class="attribute">x:Key</span><span>=</span><span class="attribute-value">"sexEnum"</span><span> </span><span class="attribute">MethodName</span><span>=</span><span class="attribute-value">"GetValues"</span><span> </span></li><li class="alt"><span> </span><span class="attribute">ObjectType</span><span>=</span><span class="attribute-value">"{x:Type assembly:Enum}"</span><span class="tag">></span><span> </span></li><li><span> </span><span class="tag"><</span><span class="tag-name">ObjectDataProvider.MethodParameters</span><span class="tag">></span><span> </span></li><li class="alt"><span> </span><span class="tag"><</span><span class="tag-name">x:Type</span><span> </span><span class="attribute">Type</span><span>=</span><span class="attribute-value">"local:SexOpt"</span><span class="tag">/></span><span> </span></li><li><span> </span><span class="tag"></</span><span class="tag-name">ObjectDataProvider.MethodParameters</span><span class="tag">></span><span> </span></li><li class="alt"><span> </span><span class="tag"></</span><span class="tag-name">ObjectDataProvider</span><span class="tag">></span><span> </span></li><li><span> </span><span class="tag"></</span><span class="tag-name">Window.Resources</span><span class="tag">></span><span> </span></li><li class="alt"><span> </span><span class="tag"><</span><span class="tag-name">Grid</span><span class="tag">></span><span> </span></li><li><span> </span><span class="tag"><</span><span class="tag-name">DataGrid</span><span> </span><span class="attribute">x:Name</span><span>=</span><span class="attribute-value">"dataGrid"</span><span> </span><span class="attribute">ItemsSource</span><span>=</span><span class="attribute-value">"{Binding}"</span><span> </span><span class="attribute">AutoGenerateColumns</span><span>=</span><span class="attribute-value">"False"</span><span class="tag">></span><span> </span></li><li class="alt"><span> </span><span class="tag"><</span><span class="tag-name">DataGrid.Columns</span><span class="tag">></span><span> </span></li><li><span> </span><span class="tag"><</span><span class="tag-name">DataGridTextColumn</span><span> </span><span class="attribute">Header</span><span>=</span><span class="attribute-value">"Name"</span><span> </span><span class="attribute">Width</span><span>=</span><span class="attribute-value">"80"</span><span> </span><span class="attribute">Binding</span><span>=</span><span class="attribute-value">"{Binding Name}"</span><span class="tag">/></span><span> </span></li><li class="alt"><span> </span><span class="tag"><</span><span class="tag-name">DataGridTextColumn</span><span> </span><span class="attribute">Header</span><span>=</span><span class="attribute-value">"Age"</span><span> </span><span class="attribute">Width</span><span>=</span><span class="attribute-value">"50"</span><span> </span><span class="attribute">Binding</span><span>=</span><span class="attribute-value">"{Binding Age}"</span><span class="tag">/></span><span> </span></li><li><span> </span><span class="tag"><</span><span class="tag-name">DataGridComboBoxColumn</span><span> </span><span class="attribute">Width</span><span>=</span><span class="attribute-value">"80"</span><span> </span><span class="attribute">Header</span><span>=</span><span class="attribute-value">"Sex"</span><span> </span></li><li class="alt"><span> </span><span class="attribute">SelectedItemBinding</span><span>=</span><span class="attribute-value">"{Binding Sex}"</span><span> </span></li><li><span> </span><span class="attribute">ItemsSource</span><span>=</span><span class="attribute-value">"{Binding Source={StaticResource sexEnum}}"</span><span class="tag">/></span><span> </span></li><li class="alt"><span> </span><span class="tag"><</span><span class="tag-name">DataGridCheckBoxColumn</span><span> </span><span class="attribute">Header</span><span>=</span><span class="attribute-value">"Pass Exam?"</span><span> </span><span class="attribute">Width</span><span>=</span><span class="attribute-value">"100"</span><span> </span></li><li><span> </span><span class="attribute">Binding</span><span>=</span><span class="attribute-value">"{Binding Pass}"</span><span class="tag">/></span><span> </span></li><li class="alt"><span> </span><span class="tag"><</span><span class="tag-name">DataGridHyperlinkColumn</span><span> </span><span class="attribute">Header</span><span>=</span><span class="attribute-value">"Email"</span><span> </span><span class="attribute">Width</span><span>=</span><span class="attribute-value">"150"</span><span> </span></li><li><span> </span><span class="attribute">Binding</span><span>=</span><span class="attribute-value">"{Binding Email}"</span><span class="tag">/></span><span> </span></li><li class="alt"><span> </span><span class="tag"></</span><span class="tag-name">DataGrid.Columns</span><span class="tag">></span><span> </span></li><li><span> </span><span class="tag"></</span><span class="tag-name">DataGrid</span><span class="tag">></span><span> </span></li><li class="alt"><span> </span><span class="tag"></</span><span class="tag-name">Grid</span><span class="tag">></span><span> </span></li><li><span class="tag"></</span><span class="tag-name">Window</span><span class="tag">></span><span> </span></li></ol> |
其中每列都包含各自的数值类型，在C# 中创建Member 类及SexOpt 枚举，并将memberData 数据绑定到DataGrid：
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<ol class="dp-c"><li class="alt"><span><span class="keyword">using</span><span> System; </span></span></li><li><span class="keyword">using</span><span> System.Windows; </span></li><li class="alt"><span class="keyword">using</span><span> System.Collections.ObjectModel; </span></li><li><span> </span></li><li class="alt"><span class="keyword">namespace</span><span> WPF4ControlTest </span></li><li><span>{ </span></li><li class="alt"><span> </span><span class="comment">/// <summary> </span><span> </span></li><li><span> </span><span class="comment">/// Interaction logic for MainWindow.xaml </span><span> </span></li><li class="alt"><span> </span><span class="comment">/// </summary> </span><span> </span></li><li><span> </span><span class="keyword">public</span><span> partial </span><span class="keyword">class</span><span> MainWindow : Window </span></li><li class="alt"><span> { </span></li><li><span> </span><span class="keyword">public</span><span> MainWindow() </span></li><li class="alt"><span> { </span></li><li><span> InitializeComponent(); </span></li><li><span>ObservableCollection<Member> memberData = </span><span class="keyword">new</span><span> ObservableCollection<Member>(); </span></li><li><span> memberData.Add(</span><span class="keyword">new</span><span> Member() </span></li><li class="alt"><span> { </span></li><li><span> Name = </span><span class="string">"Joe"</span><span>, Age = </span><span class="string">"23"</span><span>, Sex = SexOpt.Male, </span></li><li class="alt"><span> Pass = </span><span class="keyword">true</span><span>, Email = </span><span class="keyword">new</span><span> Uri(</span><span class="string">"mailto:Joe@school.com"</span><span>) </span></li><li><span> }); </span></li><li class="alt"><span> memberData.Add(</span><span class="keyword">new</span><span> Member() </span></li><li><span> { </span></li><li class="alt"><span> Name = </span><span class="string">"Mike"</span><span>, Age = </span><span class="string">"20"</span><span>, </span></li><li><span> Sex = SexOpt.Male, Pass = </span><span class="keyword">false</span><span>, </span></li><li class="alt"><span> Email = </span><span class="keyword">new</span><span> Uri(</span><span class="string">"mailto:Mike@school.com"</span><span>) </span></li><li><span> }); </span></li><li class="alt"><span> memberData.Add(</span><span class="keyword">new</span><span> Member() </span></li><li><span> { </span></li><li class="alt"><span> Name = </span><span class="string">"Lucy"</span><span>, Age = </span><span class="string">"25"</span><span>, </span></li><li><span> Sex = SexOpt.Female, Pass = </span><span class="keyword">true</span><span>, </span></li><li class="alt"><span> Email = </span><span class="keyword">new</span><span> Uri(</span><span class="string">"mailto:Lucy@school.com"</span><span>) </span></li><li><span> }); </span></li><li class="alt"><span> dataGrid.DataContext = memberData; </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> </span><span class="keyword">enum</span><span> SexOpt { Male, Female }; </span></li><li><span> </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> Member </span></li><li><span> { </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> </span><span class="keyword">string</span><span> Name { </span><span class="keyword">get</span><span>; </span><span class="keyword">set</span><span>; } </span></li><li><span> </span><span class="keyword">public</span><span> </span><span class="keyword">string</span><span> Age { </span><span class="keyword">get</span><span>; </span><span class="keyword">set</span><span>; } </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> SexOpt Sex { </span><span class="keyword">get</span><span>; </span><span class="keyword">set</span><span>; } </span></li><li><span> </span><span class="keyword">public</span><span> </span><span class="keyword">bool</span><span> Pass { </span><span class="keyword">get</span><span>; </span><span class="keyword">set</span><span>; } </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> Uri Email { </span><span class="keyword">get</span><span>; </span><span class="keyword">set</span><span>; } </span></li><li><span> } </span></li><li class="alt"><span>} </span></li></ol> |
这样我们就可以通过自定义列的方式创建出DataGrid： 选择模式 默认情况下，DataGrid 的选择模式为“全行选择”，并且可以同时选择多行（如下图所示），我们可以通过SelectionMode 和SelectionUnit 属性来修改DataGrid 的选择模式。 SelectionUnit：包含Cell、FullRow 和CellOrRowHeader 三种单元选择模式。 ◆Cell：选择单元格； ◆FullRow：选择全行； ◆CellOrRowHeader：可选择单元格，也可以通过点击行首选择全行； SelectionMode：分为Extended 和Single 两种模式。 ◆Extended：选择多个单元（单元格或全行，由SelectionUnit 定义）； ◆Single：选择唯一单元（单元格或全行，由SelectionUnit 定义）；
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<ol class="dp-xml"><li class="alt"><span><span class="tag"><</span><span class="tag-name">DataGrid</span><span> </span><span class="attribute">x:Name</span><span>=</span><span class="attribute-value">"dataGrid"</span><span> </span><span class="attribute">ItemsSource</span><span>=</span><span class="attribute-value">"{Binding}"</span><span> </span><span class="attribute">AutoGenerateColumns</span><span>=</span><span class="attribute-value">"False"</span><span> </span></span></li><li><span> </span><span class="attribute">SelectionUnit</span><span>=</span><span class="attribute-value">"Cell"</span><span> </span><span class="attribute">SelectionMode</span><span>=</span><span class="attribute-value">"Extended"</span><span class="tag">></span><span>… … </span></li></ol> |
设置SelectionUnit 和SelectionMode 后的实例效果： 编辑 默认情况下，我们可以直接在DataGrid 中编辑数据（下表为相关的编辑命令），当然也可以通过IsReadOnly 属性将DataGrid 设置为只读方式。
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<ol class="dp-xml"><li class="alt"><span><span class="tag"><</span><span class="tag-name">DataGrid</span><span> </span><span class="attribute">x:Name</span><span>=</span><span class="attribute-value">"dataGrid"</span><span> </span><span class="attribute">ItemsSource</span><span>=</span><span class="attribute-value">"{Binding}"</span><span> </span><span class="attribute">AutoGenerateColumns</span><span>=</span><span class="attribute-value">"False"</span><span> </span></span></li><li><span> </span><span class="attribute">SelectionUnit</span><span>=</span><span class="attribute-value">"Cell"</span><span> </span><span class="attribute">SelectionMode</span><span>=</span><span class="attribute-value">"Extended"</span><span> </span><span class="attribute">IsReadOnly</span><span>=</span><span class="attribute-value">"True"</span><span class="tag">></span><span>… … </span></li></ol> |
原文标题：WPF 4 DataGrid 控件（基本功能篇） 链接：http://www.cnblogs.com/gnielee/archive/2010/04/16/wpf4-datagrid-control-basic.html
View Details获取sqlserver数据库中所有库、表、字段名的方法
1.获取所有数据库名: SELECT Name FROM Master..SysDatabases ORDER BY Name 2.获取所有表名: SELECT Name FROM DatabaseName..SysObjects Where XType=’U' ORDER BY Name XType=’U':表示所有用户表; XType=’S':表示所有系统表; 3.获取所有字段名: SELECT Name FROM SysColumns WHERE id=Object_Id('TableName') access : 如果表存在，如何得到这个表？ SELECT * FROM MSysObjects where name=’ExamResultTime ' and type=1 and flags=0 //得到该数据库中所有的表名 SELECT name FROM MSysObjects where type=1 and flags=0 转自：http://www.soaspx.com/dotnet/sql/mssql/sql2000/sqlserver2000_20091215_2051.html
View DetailsWPF布局-布局属性（四）
在WPF布局框架中，如果标签不设置布局属性，系统默认为填充模式。当然，我们可以通过一系列标签的属性来达到布局标签的作用。 最常见的属性是Width和Height，是指定标签的宽和高。 MinWidth，MinHeight是指标签的最小宽度和最小高度，即使父容器的宽和高小于这个数字，标签也保持这个值。 MaxWidth，MaxHeight是指标签的最大宽度和最大高度。 最小和最大Width，Height将将会在一个固的区间来调整标签的大小。 HorizontalAlignment是标签在当前容器中左中右的停靠。VerticalAlignment是标签在当前容器中上中下的停靠。这两种停靠都是建立在父容器内的，只有父容器内大于标签是才能看到效果。 Margin，是一个独特的属性，它的值有三种情况，单值，表示该标签距父容器四周的距，两个值，第一个值为标签距父容器左右的距离，第二个值是标签距父器上下的距离，四个值，分别距父容器左，上，右，下的距离。如果存在Width和Height属性，它们的优先级要高于Margin。但一般情况了，两种属性的设置不会同时出现，Width和Height更强调固态的值，Margin强调随性的值，但它距边缘是固定的。 Padding和Margin相似，不同的是Padding是指标签内容与标签边界的距离。 Panel.ZIndex是一个层次的属性，这个值表示标签本身在父容器上位于那一层，值越大，越位于上层。可以用Panel.SetZIndex(标签名, 3);来设置标签元素的层次。 RenderTransofrm是一个缩放的属性，就是对当前标签的直接缩放，例子如下： <Button Content="123" ;50" Height="20" Click="Button_Click" > <Button.RenderTransform> <ScaleTransform. ScaleX="0.5" ScaleY="0.5"> </ScaleTransform> </Button.RenderTransform> </Button> C#代码： button1.RenderTransform. = new ScaleTransform(2, 2); LayoutTransform是一个旋转的属性 <Button Name="button1" Content="123" ;50" Height="20" > <Button.LayoutTransform> <RotateTransform. Angle="45"></RotateTransform> </Button.LayoutTransform> </Button> C#代码： button1.LayoutTransform. = new RotateTransform(90); 转换的类型还有MatrixTransform，如 <Button Name="button1" Content="123" ;50" Height="20" > <Button.LayoutTransform> <MatrixTransform. Matrix="3, 1, 1, 3, 0, 0"></MatrixTransform> </Button.LayoutTransform> </Button> C#代码： button1.LayoutTransform. = new MatrixTransform(3, 1, 1, 3, 0, 0); 上面的转换是用矩阵的方式实现，下面从x和y轴上来建立转换： <Button.LayoutTransform> <SkewTransform. AngleX="30" AngleY="30" ></SkewTransform> </Button.LayoutTransform> C#代码： button1.LayoutTransform. = new SkewTransform(10, 30, […]
View Details为 Web 设计师准备的 32 个有用的 CSS3 教程
很有用的 CSS3 教程来提升你的 Web 设计技能。 1. Circle Navigation Effect With CSS3to Build An Awesome 2. CSS3 Signup Form 3. Create An Animated 3d Bar Chart Using CSS3 4. Beautiful Photo Stack Gallery With JQuery and CSS3 5. Thumbnail Proximity Effect With JQuery and CSS3 6. How To Make An Awesome Cufonized Fly-Out Menu With JQuery and CSS3 7. Stylish CSS3 Progress Bars 8. Create a Unique Contact Form With CSS3 Transitions 9. Direction-Aware Hover Effect With CSS3 and JQuery 10. Create An Audio Player in HTML5 &Amp; […]
View DetailsAsp.net Web Applicatoin实现自定义HttpModule拦截异常处理
Asp.net的NamePipe机制给我们提供了很多扩展性. 使用HttpModule我们可能实现的有: 强制站点范围的Cookie策略 集中化监控与日志 编写设置与删除HTTP头 控制response输出,如删除多余空白字符 Session管理 认证与受权 下面我们来看如何实现自定义异常处理:
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<span class="lnum"> 1: </span> <span class="kwrd">public</span> <span class="kwrd">class</span> ErrorModule:IHttpModule |
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<span class="lnum"> 2: </span> { |
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<span class="lnum"> 3: </span> <span class="preproc">#region</span> IHttpModule Members |
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<span class="lnum"> 4: </span> |
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<span class="lnum"> 5: </span> <span class="rem">/// <summary></span> |
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<span class="lnum"> 6: </span> <span class="rem">/// Disposes of the resources (other than memory) used by the module that implements <see cref="T:System.Web.IHttpModule"/>.</span> |
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<span class="lnum"> 7: </span> <span class="rem">/// </summary></span> |
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<span class="lnum"> 8: </span> <span class="kwrd">public</span> <span class="kwrd">void</span> Dispose() |
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<span class="lnum"> 9: </span> { |
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<span class="lnum"> 10: </span> <span class="rem">//do nothing </span> |
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<span class="lnum"> 11: </span> } |
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<span class="lnum"> 12: </span> |
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<span class="lnum"> 13: </span> <span class="rem">/// <summary></span> |
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<span class="lnum"> 14: </span> <span class="rem">/// Initializes a module and prepares it to handle requests.</span> |
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<span class="lnum"> 15: </span> <span class="rem">/// </summary></span> |
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<span class="lnum"> 16: </span> <span class="rem">/// <param name="context">An <see cref="T:System.Web.HttpApplication"/> that provides access to the methods, properties, and events common to all application objects within an ASP.NET application</param></span> |
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<span class="lnum"> 17: </span> <span class="kwrd">public</span> <span class="kwrd">void</span> Init(HttpApplication context) |
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<span class="lnum"> 18: </span> { |
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<span class="lnum"> 19: </span> context.Error += <span class="kwrd">new</span> EventHandler(customcontext_Error); |
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<span class="lnum"> 20: </span> } |
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<span class="lnum"> 21: </span> |
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<span class="lnum"> 22: </span> <span class="kwrd">private</span> <span class="kwrd">void</span> customcontext_Error(<span class="kwrd">object</span> sender, EventArgs e) |
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<span class="lnum"> 23: </span> { |
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<span class="lnum"> 24: </span> HttpContext ctx = HttpContext.Current; |
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<span class="lnum"> 25: </span> HttpResponse response = ctx.Response; |
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<span class="lnum"> 26: </span> HttpRequest request = ctx.Request; |
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<span class="lnum"> 27: </span> |
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<span class="lnum"> 28: </span> Exception exception = ctx.Server.GetLastError(); |
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<span class="lnum"> 29: </span> |
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<span class="lnum"> 30: </span> var sboutput = <span class="kwrd">new</span> StringBuilder(); |
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<span class="lnum"> 31: </span> sboutput.Append(<span class="str">"Querystring:<p/>"</span>); |
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<span class="lnum"> 32: </span> <span class="rem">//Get out the query string </span> |
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<span class="lnum"> 33: </span> <span class="kwrd">int</span> count = request.QueryString.Count; |
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<span class="lnum"> 34: </span> <span class="kwrd">for</span> (<span class="kwrd">int</span> i = 0; i < count; i++) |
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<span class="lnum"> 35: </span> { |
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<span class="lnum"> 36: </span> sboutput.AppendFormat(<span class="str">"<br/> {0}:-- {1} "</span>, request.QueryString.Keys[i], request.QueryString[i]); |
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<span class="lnum"> 37: </span> } |
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<span class="lnum"> 38: </span> <span class="rem">//Get out the form collection info</span> |
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<span class="lnum"> 39: </span> sboutput.Append(<span class="str">"<p>-------------------------<p/>Form:<p/>"</span>); |
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<span class="lnum"> 40: </span> count = request.Form.Count; |
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<span class="lnum"> 41: </span> <span class="kwrd">for</span> (<span class="kwrd">int</span> i = 0; i < count; i++) |
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<span class="lnum"> 42: </span> { |
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<span class="lnum"> 43: </span> sboutput.AppendFormat(<span class="str">"<br/> {0}:-- {1} -- <br/>"</span>, request.Form.Keys[i], request.Form[i]); |
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<span class="lnum"> 44: </span> } |
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<span class="lnum"> 45: </span> sboutput.Append(<span class="str">"<p>-------------------------<p/>ErrorInfo:<p/>"</span>); |
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<span class="lnum"> 46: </span> sboutput.AppendFormat(<span class="str">@"Your request could not processed. Please press the back button on your browser and try again.<br/></span> |
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<span class="lnum"> 47: </span> If the problem persists, please contact technical support<p/> |
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<span class="lnum"> 48: </span> Information below is for technical support:<p/> |
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<span class="lnum"> 49: </span> <p/>URL:{0}<p/>Stacktrace:---<br/>{1}<p/>InnerException:<br/>{2}" |
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<span class="lnum"> 50: </span> , ctx.Request.Url, exception.InnerException.StackTrace, exception.InnerException); |
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<span class="lnum"> 51: </span> |
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<span class="lnum"> 52: </span> response.Write(sboutput.ToString()); |
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<span class="lnum"> 53: </span> |
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<span class="lnum"> 54: </span> <span class="rem">// To let the page finish running we clear the error</span> |
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<span class="lnum"> 55: </span> ctx.Server.ClearError(); |
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<span class="lnum"> 56: </span> } |
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<span class="lnum"> 57: </span> |
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<span class="lnum"> 58: </span> <span class="preproc">#endregion</span> |
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<span class="lnum"> 59: </span> |
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<span class="lnum"> 60: </span> } |
上面的代码实现了IHttpModule接口, 实现基于HttpApplication.Error事件, 接着我们自定义输出了一些信息,包括Form,QueryString. 最后把原来的Error信息清除了,这样你看到以前那个黄页了. 这个自定义的Module可以用于调试Web应用程序使用. Web.config中配置:
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<span class="kwrd"><</span><span class="html">httpModules</span><span class="kwrd">></span> |
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<span class="kwrd"><</span><span class="html">add</span> <span class="attr">name</span><span class="kwrd">="ErrorLoggingModule"</span> <span class="attr">type</span><span class="kwrd">="MyWeb.ErrorModule"</span><span class="kwrd">/></span> |
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<span class="kwrd"></</span><span class="html">httpModules</span><span class="kwrd">></span> |
实际开发中,我们可以做的事儿很多,对这些信息记日志,发邮件. 如下, 我们演示使用Enterprise Library 做异常处理并日志记录,部分代码如下:
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<span class="lnum"> 1: </span> <span class="rem">/// <summary></span> |
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<span class="lnum"> 2: </span> <span class="rem">/// Handles the Error event of the EntLibLogging control.</span> |
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<span class="lnum"> 3: </span> <span class="rem">/// </summary></span> |
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<span class="lnum"> 4: </span> <span class="rem">/// <param name="sender">The source of the event.</param></span> |
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<span class="lnum"> 5: </span> <span class="rem">/// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param></span> |
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<span class="lnum"> 6: </span> <span class="rem">/// <remarks>author Petter Liu http://wintersun.cnblogs.com</remarks></span> |
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<span class="lnum"> 7: </span> <span class="kwrd">private</span> <span class="kwrd">void</span> EntLibLogging_Error(<span class="kwrd">object</span> sender, EventArgs e) |
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<span class="lnum"> 8: </span> { |
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<span class="lnum"> 9: </span> var builder = <span class="kwrd">new</span> ConfigurationSourceBuilder(); |
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<span class="lnum"> 10: </span> |
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<span class="lnum"> 11: </span> builder.ConfigureInstrumentation() |
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<span class="lnum"> 12: </span> .ForApplicationInstance(<span class="str">"MyApp"</span>) |
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<span class="lnum"> 13: </span> .EnableLogging() |
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<span class="lnum"> 14: </span> .EnablePerformanceCounters(); |
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<span class="lnum"> 15: </span> |
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<span class="lnum"> 16: </span> <span class="rem">//a single exception handling policy named MyPolicy for exceptions of type ArgumentNullException. </span> |
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<span class="lnum"> 17: </span> <span class="rem">//The handler for this exception policy will log the exception to the General category (defined in the Logging Application Block configuration) </span> |
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<span class="lnum"> 18: </span> <span class="rem">//as a warning with event ID 9000, wrap the ArgumentNullException with an InvalidOperationException, set the new exception message to MyMessage, and then re-throw the exception.</span> |
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<span class="lnum"> 19: </span> builder.ConfigureExceptionHandling() |
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<span class="lnum"> 20: </span> .GivenPolicyWithName(<span class="str">"MyPolicy"</span>) |
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<span class="lnum"> 21: </span> .ForExceptionType<ArgumentNullException>() |
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<span class="lnum"> 22: </span> .LogToCategory(<span class="str">"Exception"</span>) |
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<span class="lnum"> 23: </span> .WithSeverity(System.Diagnostics.TraceEventType.Warning) |
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<span class="lnum"> 24: </span> .UsingEventId(9000) |
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<span class="lnum"> 25: </span> .WrapWith<InvalidOperationException>() |
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<span class="lnum"> 26: </span> .UsingMessage(<span class="str">"MyMessage"</span>) |
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<span class="lnum"> 27: </span> .ThenNotifyRethrow(); |
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<span class="lnum"> 28: </span> |
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<span class="lnum"> 29: </span> <span class="rem">//logging application </span> |
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<span class="lnum"> 30: </span> builder.ConfigureLogging() |
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<span class="lnum"> 31: </span> .WithOptions |
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<span class="lnum"> 32: </span> .DoNotRevertImpersonation() |
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<span class="lnum"> 33: </span> .LogToCategoryNamed(<span class="str">"Exception"</span>) |
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<span class="lnum"> 34: </span> .SendTo.FlatFile(<span class="str">"Exception Logging File"</span>) |
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<span class="lnum"> 35: </span> .FormatWith(<span class="kwrd">new</span> FormatterBuilder() |
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<span class="lnum"> 36: </span> .TextFormatterNamed(<span class="str">"Text Formatter"</span>) |
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<span class="lnum"> 37: </span> . UsingTemplate(<span class="str">"Timestamp: {timestamp}{newline}Message: {message}{newline}Category: {category}{newline}"</span>)) |
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<span class="lnum"> 38: </span> .ToFile(<span class="str">"d:\\logs\\ExceptionsLog.log"</span>) |
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<span class="lnum"> 39: </span> .SendTo.RollingFile(<span class="str">"Rolling Log files"</span>) |
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<span class="lnum"> 40: </span> .RollAfterSize(1024) |
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<span class="lnum"> 41: </span> .ToFile(<span class="str">"d:\\logs\\Rollinglog.log"</span>) |
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<span class="lnum"> 42: </span> .LogToCategoryNamed(<span class="str">"General"</span>) |
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<span class="lnum"> 43: </span> .WithOptions.SetAsDefaultCategory() |
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<span class="lnum"> 44: </span> .SendTo.SharedListenerNamed(<span class="str">"Exception Logging File"</span>); |
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<span class="lnum"> 45: </span> |
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<span class="lnum"> 46: </span> var configSource = <span class="kwrd">new</span> DictionaryConfigurationSource(); |
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<span class="lnum"> 47: </span> builder.UpdateConfigurationWithReplace(configSource); |
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<span class="lnum"> 48: </span> EnterpriseLibraryContainer.Current = EnterpriseLibraryContainer.CreateDefaultContainer(configSource); |
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<span class="lnum"> 49: </span> |
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<span class="lnum"> 50: </span> var ex = HttpContext.Current.Server.GetLastError(); |
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<span class="lnum"> 51: </span> var em = EnterpriseLibraryContainer.Current.GetInstance<ExceptionManager>(); |
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<span class="lnum"> 52: </span> em.HandleException(ex.InnerException, <span class="str">"MyPolicy"</span>); |
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<span class="lnum"> 53: </span> } |
注意上面的代码, 为了运行代码您需要引用以下程序集 Enterprise Library Share Common LibraryMicrosoft.Practices.ServiceLocationLogging Application BlockException Handling Application BlockException Handling Logging Provider 这里我们使用Fluent API配置, 因此没有配置XML文件. 所以不需要Web.Config中配置任何信息. 代码中有注释. 为了测试我们使用一个PAGE故意Throw 一个ArgumentNullException. 通过Server.GetLastError()获取Exception, 这时由名为MyPolicy策略处理异常. 对于ArgumentNullException把它们记录日志到名为Exception分类中,这个日志文件位于d:\\logs\\ExceptionLog.log.实际开发你完全按照你的需要来自定义策略. 然后这个日志文件中写出的内容是这样的:
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----------------------------------------Timestamp: 2011-11-12 5:57:08Message: HandlingInstanceID: a99d005d-5f8d-4613-9522-2d60efb089aaAn exception of type <span class="str">'System.ArgumentNullException'</span> occurred and was caught.----------------------------------------------------------------------------11/12/2011 13:57:08Type : System.ArgumentNullException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089Message : Value cannot be <span class="kwrd">null</span>.Parameter name: Demo errorSource : MyWebHelp link : ParamName : Demo errorData : System.Collections.ListDictionaryInternalTargetSite : Void Page_Load(System.Object, System.EventArgs)Stack Trace : at MyWeb.About.Page_Load(Object sender, EventArgs e) <span class="kwrd">in</span> H:\My Project\DotNet40\TDD2010\WebHost\MyWeb\About.aspx.cs:line 14 at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)Additional Info:MachineName : USERTimeStamp : 2011-11-12 5:57:08FullName : Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35AppDomainName : 3e5cb21e-3-129655510216406250ThreadIdentity : WindowsIdentity : USER\PetterCategory: Exception |
由于我们日志模块我们配置还需要写Rollinglog.log文件,内容如下:
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----------------------------------------Exception Warning: 9000 : Timestamp: 2011-11-12 5:57:08Message: HandlingInstanceID: a99d005d-5f8d-4613-9522-2d60efb089aaAn exception of type <span class="str">'System.ArgumentNullException'</span> occurred and was caught.----------------------------------------------------------------------------11/12/2011 13:57:08Type : System.ArgumentNullException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089Message : Value cannot be <span class="kwrd">null</span>.Parameter name: Demo errorSource : MyWebHelp link : ParamName : Demo errorData : System.Collections.ListDictionaryInternalTargetSite : Void Page_Load(System.Object, System.EventArgs)Stack Trace : at MyWeb.About.Page_Load(Object sender, EventArgs e) <span class="kwrd">in</span> H:\My Project\DotNet40\TDD2010\WebHost\MyWeb\About.aspx.cs:line 14 at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)Additional Info:MachineName : USERTimeStamp : 2011-11-12 5:57:08FullName : Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35AppDomainName : 3e5cb21e-3-129655510216406250ThreadIdentity : WindowsIdentity : USER\PetterCategory: ExceptionPriority: 0EventId: 9000Severity: WarningTitle:Enterprise Library Exception HandlingMachine: USERApp Domain: 3e5cb21e-3-129655510216406250ProcessId: 2444Process Name: C:\Program Files\Common Files\Microsoft Shared\DevServer\10.0\WebDev.WebServer40.exeThread Name: Win32 ThreadId:2748Extended Properties: ---------------------------------------- |
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你可以看到上面的EventId=9000与我们之前在CODE中配置是相同的. <br /> |
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在开源社区有一个组件<a href="http://code.google.com/p/elmah/" target="_blank">ELMAH</a>(Error Logging Modules and Handlers for ASP.NET),已实现Error处理发邮件,写DB,发送到SNS等功能. 我们随意来看下它的代码:<br />它就是基于IHttpModule的扩展,下面代码来ELMAH: |
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<span class="lnum"> 1: </span> <span class="rem">/// <summary></span> |
|
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<span class="lnum"> 2: </span> <span class="rem">/// Provides an abstract base class for <see cref="IHttpModule"/> that</span> |
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<span class="lnum"> 3: </span> <span class="rem">/// supports discovery from within partial trust environments.</span> |
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<span class="lnum"> 4: </span> <span class="rem">/// </summary></span> |
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<span class="lnum"> 5: </span> <span class="kwrd">public</span> <span class="kwrd">abstract</span> <span class="kwrd">class</span> HttpModuleBase : IHttpModule |
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<span class="lnum"> 6: </span> { |
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<span class="lnum"> 7: </span> <span class="kwrd">void</span> IHttpModule.Init(HttpApplication context) |
|
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<span class="lnum"> 8: </span> { |
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<span class="lnum"> 9: </span> <span class="kwrd">if</span> (context == <span class="kwrd">null</span>) |
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<span class="lnum"> 10: </span> <span class="kwrd">throw</span> <span class="kwrd">new</span> ArgumentNullException(<span class="str">"context"</span>); |
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<span class="lnum"> 11: </span> |
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<span class="lnum"> 12: </span> <span class="kwrd">if</span> (SupportDiscoverability) |
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<span class="lnum"> 13: </span> HttpModuleRegistry.RegisterInPartialTrust(context, <span class="kwrd">this</span>); |
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<span class="lnum"> 14: </span> |
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<span class="lnum"> 15: </span> OnInit(context); |
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<span class="lnum"> 16: </span> } |
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<span class="lnum"> 17: </span> |
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<span class="lnum"> 18: </span> <span class="kwrd">void</span> IHttpModule.Dispose() |
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1 |
<span class="lnum"> 19: </span> { |
|
1 |
<span class="lnum"> 20: </span> OnDispose(); |
|
1 |
<span class="lnum"> 21: </span> } |
|
1 |
<span class="lnum"> 22: </span> |
|
1 |
<span class="lnum"> 23: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 24: </span> <span class="rem">/// Determines whether the module will be registered for discovery</span> |
|
1 |
<span class="lnum"> 25: </span> <span class="rem">/// in partial trust environments or not.</span> |
|
1 |
<span class="lnum"> 26: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 27: </span> <span class="kwrd">protected</span> <span class="kwrd">virtual</span> <span class="kwrd">bool</span> SupportDiscoverability |
|
1 |
<span class="lnum"> 28: </span> { |
|
1 |
<span class="lnum"> 29: </span> get { <span class="kwrd">return</span> <span class="kwrd">false</span>; } |
|
1 |
<span class="lnum"> 30: </span> } |
|
1 |
<span class="lnum"> 31: </span> |
|
1 |
<span class="lnum"> 32: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 33: </span> <span class="rem">/// Initializes the module and prepares it to handle requests.</span> |
|
1 |
<span class="lnum"> 34: </span> <span class="rem">/// </summary></span> |
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1 |
<span class="lnum"> 35: </span> <span class="kwrd">protected</span> <span class="kwrd">virtual</span> <span class="kwrd">void</span> OnInit(HttpApplication application) {} |
|
1 |
<span class="lnum"> 36: </span> |
|
1 |
<span class="lnum"> 37: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 38: </span> <span class="rem">/// Disposes of the resources (other than memory) used by the module.</span> |
|
1 |
<span class="lnum"> 39: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 40: </span> <span class="kwrd">protected</span> <span class="kwrd">virtual</span> <span class="kwrd">void</span> OnDispose() {} |
|
1 |
<span class="lnum"> 41: </span> } |
|
1 |
这是ErrorLogModule实现之前HttpModuleBase: |
|
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<span class="lnum"> 1: </span><span class="kwrd">public</span> <span class="kwrd">class</span> ErrorLogModule : HttpModuleBase, IExceptionFiltering |
|
1 |
<span class="lnum"> 2: </span> { |
|
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<span class="lnum"> 3: </span> <span class="kwrd">public</span> <span class="kwrd">event</span> ExceptionFilterEventHandler Filtering; |
|
1 |
<span class="lnum"> 4: </span> <span class="kwrd">public</span> <span class="kwrd">event</span> ErrorLoggedEventHandler Logged; |
|
1 |
<span class="lnum"> 5: </span> |
|
1 |
<span class="lnum"> 6: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 7: </span> <span class="rem">/// Initializes the module and prepares it to handle requests.</span> |
|
1 |
<span class="lnum"> 8: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 9: </span> |
|
1 |
<span class="lnum"> 10: </span> <span class="kwrd">protected</span> <span class="kwrd">override</span> <span class="kwrd">void</span> OnInit(HttpApplication application) |
|
1 |
<span class="lnum"> 11: </span> { |
|
1 |
<span class="lnum"> 12: </span> <span class="kwrd">if</span> (application == <span class="kwrd">null</span>) |
|
1 |
<span class="lnum"> 13: </span> <span class="kwrd">throw</span> <span class="kwrd">new</span> ArgumentNullException(<span class="str">"application"</span>); |
|
1 |
<span class="lnum"> 14: </span> |
|
1 |
<span class="lnum"> 15: </span> application.Error += <span class="kwrd">new</span> EventHandler(OnError); |
|
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<span class="lnum"> 16: </span> ErrorSignal.Get(application).Raised += <span class="kwrd">new</span> ErrorSignalEventHandler(OnErrorSignaled); |
|
1 |
<span class="lnum"> 17: </span> } |
|
1 |
<span class="lnum"> 18: </span> |
|
1 |
<span class="lnum"> 19: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 20: </span> <span class="rem">/// Gets the <see cref="ErrorLog"/> instance to which the module</span> |
|
1 |
<span class="lnum"> 21: </span> <span class="rem">/// will log exceptions.</span> |
|
1 |
<span class="lnum"> 22: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 23: </span> <span class="kwrd">protected</span> <span class="kwrd">virtual</span> ErrorLog GetErrorLog(HttpContext context) |
|
1 |
<span class="lnum"> 24: </span> { |
|
1 |
<span class="lnum"> 25: </span> <span class="kwrd">return</span> ErrorLog.GetDefault(context); |
|
1 |
<span class="lnum"> 26: </span> } |
|
1 |
<span class="lnum"> 27: </span> |
|
1 |
<span class="lnum"> 28: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 29: </span> <span class="rem">/// The handler called when an unhandled exception bubbles up to </span> |
|
1 |
<span class="lnum"> 30: </span> <span class="rem">/// the module.</span> |
|
1 |
<span class="lnum"> 31: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 32: </span> <span class="kwrd">protected</span> <span class="kwrd">virtual</span> <span class="kwrd">void</span> OnError(<span class="kwrd">object</span> sender, EventArgs args) |
|
1 |
<span class="lnum"> 33: </span> { |
|
1 |
<span class="lnum"> 34: </span> HttpApplication application = (HttpApplication) sender; |
|
1 |
<span class="lnum"> 35: </span> LogException(application.Server.GetLastError(), application.Context); |
|
1 |
<span class="lnum"> 36: </span> } |
|
1 |
<span class="lnum"> 37: </span> |
|
1 |
<span class="lnum"> 38: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 39: </span> <span class="rem">/// The handler called when an exception is explicitly signaled.</span> |
|
1 |
<span class="lnum"> 40: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 41: </span> <span class="kwrd">protected</span> <span class="kwrd">virtual</span> <span class="kwrd">void</span> OnErrorSignaled(<span class="kwrd">object</span> sender, ErrorSignalEventArgs args) |
|
1 |
<span class="lnum"> 42: </span> { |
|
1 |
<span class="lnum"> 43: </span> LogException(args.Exception, args.Context); |
|
1 |
<span class="lnum"> 44: </span> } |
|
1 |
<span class="lnum"> 45: </span> |
|
1 |
<span class="lnum"> 46: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 47: </span> <span class="rem">/// Logs an exception and its context to the error log.</span> |
|
1 |
<span class="lnum"> 48: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 49: </span> <span class="kwrd">protected</span> <span class="kwrd">virtual</span> <span class="kwrd">void</span> LogException(Exception e, HttpContext context) |
|
1 |
<span class="lnum"> 50: </span> { |
|
1 |
<span class="lnum"> 51: </span> <span class="kwrd">if</span> (e == <span class="kwrd">null</span>) |
|
1 |
<span class="lnum"> 52: </span> <span class="kwrd">throw</span> <span class="kwrd">new</span> ArgumentNullException(<span class="str">"e"</span>); |
|
1 |
<span class="lnum"> 53: </span> |
|
1 |
<span class="lnum"> 54: </span> <span class="rem">//</span> |
|
1 |
<span class="lnum"> 55: </span> <span class="rem">// Fire an event to check if listeners want to filter out</span> |
|
1 |
<span class="lnum"> 56: </span> <span class="rem">// logging of the uncaught exception.</span> |
|
1 |
<span class="lnum"> 57: </span> <span class="rem">//</span> |
|
1 |
<span class="lnum"> 58: </span> |
|
1 |
<span class="lnum"> 59: </span> ExceptionFilterEventArgs args = <span class="kwrd">new</span> ExceptionFilterEventArgs(e, context); |
|
1 |
<span class="lnum"> 60: </span> OnFiltering(args); |
|
1 |
<span class="lnum"> 61: </span> |
|
1 |
<span class="lnum"> 62: </span> <span class="kwrd">if</span> (args.Dismissed) |
|
1 |
<span class="lnum"> 63: </span> <span class="kwrd">return</span>; |
|
1 |
<span class="lnum"> 64: </span> |
|
1 |
<span class="lnum"> 65: </span> <span class="rem">//</span> |
|
1 |
<span class="lnum"> 66: </span> <span class="rem">// Log away...</span> |
|
1 |
<span class="lnum"> 67: </span> <span class="rem">//</span> |
|
1 |
<span class="lnum"> 68: </span> |
|
1 |
<span class="lnum"> 69: </span> ErrorLogEntry entry = <span class="kwrd">null</span>; |
|
1 |
<span class="lnum"> 70: </span> |
|
1 |
<span class="lnum"> 71: </span> <span class="kwrd">try</span> |
|
1 |
<span class="lnum"> 72: </span> { |
|
1 |
<span class="lnum"> 73: </span> Error error = <span class="kwrd">new</span> Error(e, context); |
|
1 |
<span class="lnum"> 74: </span> ErrorLog log = GetErrorLog(context); |
|
1 |
<span class="lnum"> 75: </span> <span class="kwrd">string</span> id = log.Log(error); |
|
1 |
<span class="lnum"> 76: </span> entry = <span class="kwrd">new</span> ErrorLogEntry(log, id, error); |
|
1 |
<span class="lnum"> 77: </span> } |
|
1 |
<span class="lnum"> 78: </span> <span class="kwrd">catch</span> (Exception localException) |
|
1 |
<span class="lnum"> 79: </span> { |
|
1 |
<span class="lnum"> 80: </span> <span class="rem">//</span> |
|
1 |
<span class="lnum"> 81: </span> <span class="rem">// IMPORTANT! We swallow any exception raised during the </span> |
|
1 |
<span class="lnum"> 82: </span> <span class="rem">// logging and send them out to the trace . The idea </span> |
|
1 |
<span class="lnum"> 83: </span> <span class="rem">// here is that logging of exceptions by itself should not </span> |
|
1 |
<span class="lnum"> 84: </span> <span class="rem">// be critical to the overall operation of the application.</span> |
|
1 |
<span class="lnum"> 85: </span> <span class="rem">// The bad thing is that we catch ANY kind of exception, </span> |
|
1 |
<span class="lnum"> 86: </span> <span class="rem">// even system ones and potentially let them slip by.</span> |
|
1 |
<span class="lnum"> 87: </span> <span class="rem">//</span> |
|
1 |
<span class="lnum"> 88: </span> |
|
1 |
<span class="lnum"> 89: </span> Trace.WriteLine(localException); |
|
1 |
<span class="lnum"> 90: </span> } |
|
1 |
<span class="lnum"> 91: </span> |
|
1 |
<span class="lnum"> 92: </span> <span class="kwrd">if</span> (entry != <span class="kwrd">null</span>) |
|
1 |
<span class="lnum"> 93: </span> OnLogged(<span class="kwrd">new</span> ErrorLoggedEventArgs(entry)); |
|
1 |
<span class="lnum"> 94: </span> } |
|
1 |
<span class="lnum"> 95: </span> |
|
1 |
<span class="lnum"> 96: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 97: </span> <span class="rem">/// Raises the <see cref="Logged"/> event.</span> |
|
1 |
<span class="lnum"> 98: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 99: </span> <span class="kwrd">protected</span> <span class="kwrd">virtual</span> <span class="kwrd">void</span> OnLogged(ErrorLoggedEventArgs args) |
|
1 |
<span class="lnum"> 100: </span> { |
|
1 |
<span class="lnum"> 101: </span> ErrorLoggedEventHandler handler = Logged; |
|
1 |
<span class="lnum"> 102: </span> |
|
1 |
<span class="lnum"> 103: </span> <span class="kwrd">if</span> (handler != <span class="kwrd">null</span>) |
|
1 |
<span class="lnum"> 104: </span> handler(<span class="kwrd">this</span>, args); |
|
1 |
<span class="lnum"> 105: </span> } |
|
1 |
<span class="lnum"> 106: </span> |
|
1 |
<span class="lnum"> 107: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 108: </span> <span class="rem">/// Raises the <see cref="Filtering"/> event.</span> |
|
1 |
<span class="lnum"> 109: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 110: </span> <span class="kwrd">protected</span> <span class="kwrd">virtual</span> <span class="kwrd">void</span> OnFiltering(ExceptionFilterEventArgs args) |
|
1 |
<span class="lnum"> 111: </span> { |
|
1 |
<span class="lnum"> 112: </span> ExceptionFilterEventHandler handler = Filtering; |
|
1 |
<span class="lnum"> 113: </span> |
|
1 |
<span class="lnum"> 114: </span> <span class="kwrd">if</span> (handler != <span class="kwrd">null</span>) |
|
1 |
<span class="lnum"> 115: </span> handler(<span class="kwrd">this</span>, args); |
|
1 |
<span class="lnum"> 116: </span> } |
|
1 |
<span class="lnum"> 117: </span> |
|
1 |
<span class="lnum"> 118: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 119: </span> <span class="rem">/// Determines whether the module will be registered for discovery</span> |
|
1 |
<span class="lnum"> 120: </span> <span class="rem">/// in partial trust environments or not.</span> |
|
1 |
<span class="lnum"> 121: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 122: </span> <span class="kwrd">protected</span> <span class="kwrd">override</span> <span class="kwrd">bool</span> SupportDiscoverability |
|
1 |
<span class="lnum"> 123: </span> { |
|
1 |
<span class="lnum"> 124: </span> get { <span class="kwrd">return</span> <span class="kwrd">true</span>; } |
|
1 |
<span class="lnum"> 125: </span> } |
|
1 |
<span class="lnum"> 126: </span> } |
|
1 |
更多的功能等待您去挖掘,我们在实际开发中按需选择.希望这篇POST对您开发有帮助.<br /> |
转自：http://www.cnblogs.com/wintersun/archive/2011/11/12/2246513.html
View Detailsasp.net向文本文件txt末尾追加内容
using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls; using System.IO; public partial class _Default : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { string Path = Server.MapPath("1.txt"); string strings = "1232222"; FileAdd(Path, strings); } public static void FileAdd(string Path, string strings) { //实现一个System.IO.StreamWrite,使其以一种特定的编码向流中写入数据,AppendText数据追加到文件末尾 //这句也可以写成StreamWriter sw = new StreamWriter(Path, true, Encoding.GetEncoding("GB2312")); StreamWriter sw = File.AppendText(Path); //开始写入 sw.WriteLine(strings); //清理当前编码器的缓冲区,并将所有缓存数据写入基础流 sw.Flush(); sw.Close(); } } 转自：http://blog.sina.com.cn/s/blog_812ce0500100ywjb.html
View DetailsASP.NET Global.ascx 事件大全
Global.asax 文件，有时候叫做 ASP.NET 应用程序文件，提供了一种在一个中心位置响应应用程序级或模块级事件的方法。你可以使用这个文件实现应用程序安全性以及其它一些任务。下面让我们详细看一下如何在应用程序开发工作中使用这个文件。 概述Global.asax 位 于应用程序根目录下。虽然 Visual Studio .NET 会自动插入这个文件到所有的 ASP.NET 项目中，但是它实际上是一个可选文件。 删除它不会出问题——当然是在你没有使用它的情况下。.asax 文件扩展名指出它是一个应用程序文件，而不是一个使 用 aspx 的 ASP.NET 文件。Global.asax 文件被配置为任何（通过 URL 的）直接 HTTP 请求都被自动 拒绝，所以用户不能下载或查看其内容。ASP.NET 页面框架能够自动识别出对Global.asax 文件所做的任何更改。 在 Global.asax 被更改后ASP.NET 页面框架会重新启动应用程序，包括关闭所有的浏览器会话，去除所有状态信息，并重新启动应用程序 域。 编程Global.asax 文件继承自HttpApplication 类，它维护一个HttpApplication 对象池，并在需要时将对象池中的对象分配给应用程序。Global.asax 文件包含以下事件：Application_Init：在应用程序被实例化或第一次被调用时，该事件被触发。对于所有的HttpApplication 对象实例，它都会被调用。Application_Disposed：在应用程序被销毁之前触发。这是清除以前所用资源的理想位置。Application_Error：当应用程序中遇到一个未处理的异常时，该事件被触发。Application_Start：在HttpApplication 类的第一个实例被创建时，该事件被触发。它允许你创建可以由所有HttpApplication 实例访问的对象。Application_End：在HttpApplication 类的最后一个实例被销毁时，该事件被触发。在一个应用程序的生命周期内它只被触发一次。Application_BeginRequest：在接收到一个应用程序请求时触发。对于一个请求来说，它是第一个被触发的事件，请求一般是用户输入的一个页面请求（URL）。Application_EndRequest：针对应用程序请求的最后一个事件。Application_PreRequestHandlerExecute：在 ASP.NET 页面框架开始执行诸如页面或 Web 服务之类的事件处理程序之前，该事件被触发。Application_PostRequestHandlerExecute：在 ASP.NET 页面框架结束执行一个事件处理程序时，该事件被触发。Applcation_PreSendRequestHeaders：在 ASP.NET 页面框架发送 HTTP 头给请求客户（浏览器）时，该事件被触发。Application_PreSendContent：在 ASP.NET 页面框架发送内容给请求客户（浏览器）时，该事件被触发。Application_AcquireRequestState：在 ASP.NET 页面框架得到与当前请求相关的当前状态（Session 状态）时，该事件被触发。Application_ReleaseRequestState：在 ASP.NET 页面框架执行完所有的事件处理程序时，该事件被触发。这将导致所有的状态模块保存它们当前的状态数据。Application_ResolveRequestCache：在 ASP.NET 页面框架完成一个授权请求时，该事件被触发。它允许缓存模块从缓存中为请求提供服务，从而绕过事件处理程序的执行。Application_UpdateRequestCache：在 ASP.NET 页面框架完成事件处理程序的执行时，该事件被触发，从而使缓存模块存储响应数据，以供响应后续的请求时使用。Application_AuthenticateRequest：在安全模块建立起当前用户的有效的身份时，该事件被触发。在这个时候，用户的凭据将会被验证。Application_AuthorizeRequest：当安全模块确认一个用户可以访问资源之后，该事件被触发。Session_Start：在一个新用户访问应用程序 Web 站点时，该事件被触发。 Session_End：在一个用户的会话超时、结束或他们离开应用程序 Web 站点时，该事件被触发。Application_Error 事件显示一个简单的消息用以说明发生的错误。 这个事件列表看起来好像多得吓人，但是在不同环境下这些事件可能会非常有用。使用这些事件的一个关键问题是知道它们被触发的顺序。Application_Init 和Application_Start 事件在应用程序第一次启动 时被触发一次。相似地，Application_Disposed 和 Application_End 事件在应用程序终止时被触发一次。此外，基于会 话的事件（Session_Start 和 Session_End）只在用户进入和离开站点时被使用。其余的事件则处理应用程序请求，这些事件被触发的 顺序是：Application_BeginRequestApplication_AuthenticateRequestApplication_AuthorizeRequestApplication_ResolveRequestCacheApplication_AcquireRequestStateApplication_PreRequestHandlerExecuteApplication_PreSendRequestHeadersApplication_PreSendRequestContent<<执行代码>>Application_PostRequestHandlerExecuteApplication_ReleaseRequestStateApplication_UpdateRequestCacheApplication_EndRequest 这些事件常被用于安全性方面。 转自：http://www.cnblogs.com/xiaopin/archive/2010/08/31/1813747.html
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