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：
|
1 |
<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：
|
1 |
<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）；
|
1 |
<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。
|
1 |
<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:
|
1 |
<span class="lnum"> 1: </span> <span class="kwrd">public</span> <span class="kwrd">class</span> ErrorModule:IHttpModule |
|
1 |
<span class="lnum"> 2: </span> { |
|
1 |
<span class="lnum"> 3: </span> <span class="preproc">#region</span> IHttpModule Members |
|
1 |
<span class="lnum"> 4: </span> |
|
1 |
<span class="lnum"> 5: </span> <span class="rem">/// <summary></span> |
|
1 |
<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> |
|
1 |
<span class="lnum"> 7: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 8: </span> <span class="kwrd">public</span> <span class="kwrd">void</span> Dispose() |
|
1 |
<span class="lnum"> 9: </span> { |
|
1 |
<span class="lnum"> 10: </span> <span class="rem">//do nothing </span> |
|
1 |
<span class="lnum"> 11: </span> } |
|
1 |
<span class="lnum"> 12: </span> |
|
1 |
<span class="lnum"> 13: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 14: </span> <span class="rem">/// Initializes a module and prepares it to handle requests.</span> |
|
1 |
<span class="lnum"> 15: </span> <span class="rem">/// </summary></span> |
|
1 |
<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> |
|
1 |
<span class="lnum"> 17: </span> <span class="kwrd">public</span> <span class="kwrd">void</span> Init(HttpApplication context) |
|
1 |
<span class="lnum"> 18: </span> { |
|
1 |
<span class="lnum"> 19: </span> context.Error += <span class="kwrd">new</span> EventHandler(customcontext_Error); |
|
1 |
<span class="lnum"> 20: </span> } |
|
1 |
<span class="lnum"> 21: </span> |
|
1 |
<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) |
|
1 |
<span class="lnum"> 23: </span> { |
|
1 |
<span class="lnum"> 24: </span> HttpContext ctx = HttpContext.Current; |
|
1 |
<span class="lnum"> 25: </span> HttpResponse response = ctx.Response; |
|
1 |
<span class="lnum"> 26: </span> HttpRequest request = ctx.Request; |
|
1 |
<span class="lnum"> 27: </span> |
|
1 |
<span class="lnum"> 28: </span> Exception exception = ctx.Server.GetLastError(); |
|
1 |
<span class="lnum"> 29: </span> |
|
1 |
<span class="lnum"> 30: </span> var sboutput = <span class="kwrd">new</span> StringBuilder(); |
|
1 |
<span class="lnum"> 31: </span> sboutput.Append(<span class="str">"Querystring:<p/>"</span>); |
|
1 |
<span class="lnum"> 32: </span> <span class="rem">//Get out the query string </span> |
|
1 |
<span class="lnum"> 33: </span> <span class="kwrd">int</span> count = request.QueryString.Count; |
|
1 |
<span class="lnum"> 34: </span> <span class="kwrd">for</span> (<span class="kwrd">int</span> i = 0; i < count; i++) |
|
1 |
<span class="lnum"> 35: </span> { |
|
1 |
<span class="lnum"> 36: </span> sboutput.AppendFormat(<span class="str">"<br/> {0}:-- {1} "</span>, request.QueryString.Keys[i], request.QueryString[i]); |
|
1 |
<span class="lnum"> 37: </span> } |
|
1 |
<span class="lnum"> 38: </span> <span class="rem">//Get out the form collection info</span> |
|
1 |
<span class="lnum"> 39: </span> sboutput.Append(<span class="str">"<p>-------------------------<p/>Form:<p/>"</span>); |
|
1 |
<span class="lnum"> 40: </span> count = request.Form.Count; |
|
1 |
<span class="lnum"> 41: </span> <span class="kwrd">for</span> (<span class="kwrd">int</span> i = 0; i < count; i++) |
|
1 |
<span class="lnum"> 42: </span> { |
|
1 |
<span class="lnum"> 43: </span> sboutput.AppendFormat(<span class="str">"<br/> {0}:-- {1} -- <br/>"</span>, request.Form.Keys[i], request.Form[i]); |
|
1 |
<span class="lnum"> 44: </span> } |
|
1 |
<span class="lnum"> 45: </span> sboutput.Append(<span class="str">"<p>-------------------------<p/>ErrorInfo:<p/>"</span>); |
|
1 |
<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> |
|
1 |
<span class="lnum"> 47: </span> If the problem persists, please contact technical support<p/> |
|
1 |
<span class="lnum"> 48: </span> Information below is for technical support:<p/> |
|
1 |
<span class="lnum"> 49: </span> <p/>URL:{0}<p/>Stacktrace:---<br/>{1}<p/>InnerException:<br/>{2}" |
|
1 |
<span class="lnum"> 50: </span> , ctx.Request.Url, exception.InnerException.StackTrace, exception.InnerException); |
|
1 |
<span class="lnum"> 51: </span> |
|
1 |
<span class="lnum"> 52: </span> response.Write(sboutput.ToString()); |
|
1 |
<span class="lnum"> 53: </span> |
|
1 |
<span class="lnum"> 54: </span> <span class="rem">// To let the page finish running we clear the error</span> |
|
1 |
<span class="lnum"> 55: </span> ctx.Server.ClearError(); |
|
1 |
<span class="lnum"> 56: </span> } |
|
1 |
<span class="lnum"> 57: </span> |
|
1 |
<span class="lnum"> 58: </span> <span class="preproc">#endregion</span> |
|
1 |
<span class="lnum"> 59: </span> |
|
1 |
<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:
|
1 |
<span class="kwrd"><</span><span class="html">httpModules</span><span class="kwrd">></span> |
|
1 |
<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> |
|
1 |
<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:
|
1 |
<span class="lnum"> 1: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 2: </span> <span class="rem">/// Handles the Error event of the EntLibLogging control.</span> |
|
1 |
<span class="lnum"> 3: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 4: </span> <span class="rem">/// <param name="sender">The source of the event.</param></span> |
|
1 |
<span class="lnum"> 5: </span> <span class="rem">/// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param></span> |
|
1 |
<span class="lnum"> 6: </span> <span class="rem">/// <remarks>author Petter Liu http://wintersun.cnblogs.com</remarks></span> |
|
1 |
<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) |
|
1 |
<span class="lnum"> 8: </span> { |
|
1 |
<span class="lnum"> 9: </span> var builder = <span class="kwrd">new</span> ConfigurationSourceBuilder(); |
|
1 |
<span class="lnum"> 10: </span> |
|
1 |
<span class="lnum"> 11: </span> builder.ConfigureInstrumentation() |
|
1 |
<span class="lnum"> 12: </span> .ForApplicationInstance(<span class="str">"MyApp"</span>) |
|
1 |
<span class="lnum"> 13: </span> .EnableLogging() |
|
1 |
<span class="lnum"> 14: </span> .EnablePerformanceCounters(); |
|
1 |
<span class="lnum"> 15: </span> |
|
1 |
<span class="lnum"> 16: </span> <span class="rem">//a single exception handling policy named MyPolicy for exceptions of type ArgumentNullException. </span> |
|
1 |
<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> |
|
1 |
<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> |
|
1 |
<span class="lnum"> 19: </span> builder.ConfigureExceptionHandling() |
|
1 |
<span class="lnum"> 20: </span> .GivenPolicyWithName(<span class="str">"MyPolicy"</span>) |
|
1 |
<span class="lnum"> 21: </span> .ForExceptionType<ArgumentNullException>() |
|
1 |
<span class="lnum"> 22: </span> .LogToCategory(<span class="str">"Exception"</span>) |
|
1 |
<span class="lnum"> 23: </span> .WithSeverity(System.Diagnostics.TraceEventType.Warning) |
|
1 |
<span class="lnum"> 24: </span> .UsingEventId(9000) |
|
1 |
<span class="lnum"> 25: </span> .WrapWith<InvalidOperationException>() |
|
1 |
<span class="lnum"> 26: </span> .UsingMessage(<span class="str">"MyMessage"</span>) |
|
1 |
<span class="lnum"> 27: </span> .ThenNotifyRethrow(); |
|
1 |
<span class="lnum"> 28: </span> |
|
1 |
<span class="lnum"> 29: </span> <span class="rem">//logging application </span> |
|
1 |
<span class="lnum"> 30: </span> builder.ConfigureLogging() |
|
1 |
<span class="lnum"> 31: </span> .WithOptions |
|
1 |
<span class="lnum"> 32: </span> .DoNotRevertImpersonation() |
|
1 |
<span class="lnum"> 33: </span> .LogToCategoryNamed(<span class="str">"Exception"</span>) |
|
1 |
<span class="lnum"> 34: </span> .SendTo.FlatFile(<span class="str">"Exception Logging File"</span>) |
|
1 |
<span class="lnum"> 35: </span> .FormatWith(<span class="kwrd">new</span> FormatterBuilder() |
|
1 |
<span class="lnum"> 36: </span> .TextFormatterNamed(<span class="str">"Text Formatter"</span>) |
|
1 |
<span class="lnum"> 37: </span> . UsingTemplate(<span class="str">"Timestamp: {timestamp}{newline}Message: {message}{newline}Category: {category}{newline}"</span>)) |
|
1 |
<span class="lnum"> 38: </span> .ToFile(<span class="str">"d:\\logs\\ExceptionsLog.log"</span>) |
|
1 |
<span class="lnum"> 39: </span> .SendTo.RollingFile(<span class="str">"Rolling Log files"</span>) |
|
1 |
<span class="lnum"> 40: </span> .RollAfterSize(1024) |
|
1 |
<span class="lnum"> 41: </span> .ToFile(<span class="str">"d:\\logs\\Rollinglog.log"</span>) |
|
1 |
<span class="lnum"> 42: </span> .LogToCategoryNamed(<span class="str">"General"</span>) |
|
1 |
<span class="lnum"> 43: </span> .WithOptions.SetAsDefaultCategory() |
|
1 |
<span class="lnum"> 44: </span> .SendTo.SharedListenerNamed(<span class="str">"Exception Logging File"</span>); |
|
1 |
<span class="lnum"> 45: </span> |
|
1 |
<span class="lnum"> 46: </span> var configSource = <span class="kwrd">new</span> DictionaryConfigurationSource(); |
|
1 |
<span class="lnum"> 47: </span> builder.UpdateConfigurationWithReplace(configSource); |
|
1 |
<span class="lnum"> 48: </span> EnterpriseLibraryContainer.Current = EnterpriseLibraryContainer.CreateDefaultContainer(configSource); |
|
1 |
<span class="lnum"> 49: </span> |
|
1 |
<span class="lnum"> 50: </span> var ex = HttpContext.Current.Server.GetLastError(); |
|
1 |
<span class="lnum"> 51: </span> var em = EnterpriseLibraryContainer.Current.GetInstance<ExceptionManager>(); |
|
1 |
<span class="lnum"> 52: </span> em.HandleException(ex.InnerException, <span class="str">"MyPolicy"</span>); |
|
1 |
<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:
|
1 |
----------------------------------------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:
|
1 |
----------------------------------------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: ---------------------------------------- |
|
1 |
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 /> |
|
1 |
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: |
|
1 |
<span class="lnum"> 1: </span> <span class="rem">/// <summary></span> |
|
1 |
<span class="lnum"> 2: </span> <span class="rem">/// Provides an abstract base class for <see cref="IHttpModule"/> that</span> |
|
1 |
<span class="lnum"> 3: </span> <span class="rem">/// supports discovery from within partial trust environments.</span> |
|
1 |
<span class="lnum"> 4: </span> <span class="rem">/// </summary></span> |
|
1 |
<span class="lnum"> 5: </span> <span class="kwrd">public</span> <span class="kwrd">abstract</span> <span class="kwrd">class</span> HttpModuleBase : IHttpModule |
|
1 |
<span class="lnum"> 6: </span> { |
|
1 |
<span class="lnum"> 7: </span> <span class="kwrd">void</span> IHttpModule.Init(HttpApplication context) |
|
1 |
<span class="lnum"> 8: </span> { |
|
1 |
<span class="lnum"> 9: </span> <span class="kwrd">if</span> (context == <span class="kwrd">null</span>) |
|
1 |
<span class="lnum"> 10: </span> <span class="kwrd">throw</span> <span class="kwrd">new</span> ArgumentNullException(<span class="str">"context"</span>); |
|
1 |
<span class="lnum"> 11: </span> |
|
1 |
<span class="lnum"> 12: </span> <span class="kwrd">if</span> (SupportDiscoverability) |
|
1 |
<span class="lnum"> 13: </span> HttpModuleRegistry.RegisterInPartialTrust(context, <span class="kwrd">this</span>); |
|
1 |
<span class="lnum"> 14: </span> |
|
1 |
<span class="lnum"> 15: </span> OnInit(context); |
|
1 |
<span class="lnum"> 16: </span> } |
|
1 |
<span class="lnum"> 17: </span> |
|
1 |
<span class="lnum"> 18: </span> <span class="kwrd">void</span> IHttpModule.Dispose() |
|
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> |
|
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: |
|
1 |
<span class="lnum"> 1: </span><span class="kwrd">public</span> <span class="kwrd">class</span> ErrorLogModule : HttpModuleBase, IExceptionFiltering |
|
1 |
<span class="lnum"> 2: </span> { |
|
1 |
<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); |
|
1 |
<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
View Details[转]Asp.net中的web.config配置
web.config是asp.net中保存配置信息（比如数据库连接字符串等）的重要文件。它是基于xml的文本文件方式放在Web应用程序的任何目录中，并且默认不随源文件编译到Dll中，而运行环境随时监视着它是否有改变，一但有变动，系统会自动重新加载里面的最新内容。 一、 配置文件保存位置 .net的默认配置文件保存在“windows目录\Microsoft.NET\Framework\对应.net版本\config”文件夹下面。不同的操作系统windows目录不一样，我们在命令行下输入“echo %windir%”查看windows目录所在的位置。 图：web.config所在的目录 Asp.net中有两个非常重要的配置文件，分别是machine.config和web.config，它们都位于config文件夹下面。这两个文件一般不需要我们手工是维护它，保持默认即可。但针对asp.net应用程序，它自身会有0个，1个或者多个web.config配置文件，多个配置文件会存在加载顺序问题。下节会介绍。 注意，传说中.net3.0和.net3.5只是在.net2.0的基础上扩充中，所以还是没用的.net2.0的配置文件。它们连config这个目录都没有。 二、 配置文件加载顺序 IIS在Asp.net网站启动时，会加载配置文件中的配置信息，然后缓存这些信息，不会每次要用都去读取配置文件，只是IIS会随时监视着这些文件的变化，一量有变化，它会重新去读取并缓存配置信息。 Asp.net网站运行时会按照以下方式加载配置文件中的节点信息： 1) 如果在当前运行页面所在的目录下有web.config文件，则查找是否存在所需要的节点，如果存在则返回结果，并停止下一步地查找。 2) 如里所在目录不存在web.config配置或者配置文件里没有所需要的节点，则查找它所在的上一级目录的配置文件中的节点，直到网站根目录。（问题：IIS6中的虚拟目录算不算根目录） 3) 如果网站根目录中都不存在web.config或者所需要的配置节点，转而到“windows目录\Microsoft.NET\Framework\对应.net版本\config\web.config”中去查找。 4) 如果第3条中还没找到，继续到“windows目录\Microsoft.NET\Framework\对应.net版本\config\machine.config”中去查找。 5) 如果还没找到，那就报错吧。 存在两个问题 1) IIS6中的虚拟目录算不算根目录。 2) 在系统运行时，在一个原本没有web.config的目录中手工加上一个web.config，会不会自动加载。 三、 配置文件节点介绍 Web.config文件是一个xml文本文件，它的根节点为<configuration>,该节点下包含常见的子节点有：<configSections>、<appSettings>、<connectionStrings>（保存数据库连接字符串）、<location>和<system.web>。下面针对各节点配置进行介绍。 1. <configSections> configSections 元素指定了配置节和处理程序声明。由于 ASP.NET 不对如何处理配置文件内的设置作任何假设，因此这非常必要。但 ASP.NET 会将配置数据的处理委托给配置节处理程序。配置结构信息如下： <configSections> <!--定义配置节处理程序与配置元素之间的关联。--> <section /> <!--定义配置节处理程序与配置节之间的关联。--> <sectionGroup /> <!--移除对继承的节和节组的引用。--> <remove /> <!--移除对继承的节和节组的所有引用，只允许由当前 section 和 sectionGroup 元素添加的节和节组。--> <clear/> </configSections> 每个 section 元素标识一个配置节或元素以及对该配置节或元素进行处理的关联 ConfigurationSection 派生类。可以在 sectionGroup 元素中对 section 元素进行逻辑分组，以对 section 元素进行组织并避免命名冲突。section 和 sectionGroup 元素包含在 configSections 元素中。 如果配置文件中包含 configSections 元素，则 configSections 元素必须是 configuration 元素的第一个子元素。 下面我们来示例写一个自定义配置信息，并完成它的SectionHandler，首先我们在<configuration>节点下添加configSections。 <configuration> <configSections> <sectionGroup name="mySectionGroup"> <section name="mySection" requirePermission="true" type="ConfigTest.SectionHandler.MySectionHandler,ConfigTest.SectionHandler" /> […]
View Details为程序员准备的7个国外社交网站
ForrstForrest是为开发人员和设计师提供的一个新兴的地方，在这里可以分享代码和截图以及链接，启发你的灵感。如果你曾想为你的一块代码获得一些专业实诚 的建议；如果你在几个logo中没法做出决定的时候，Forrst正好适合你。此社区正处扩张期，仍然以邀请的方式注册，但我还是强烈推荐给你，没有什么 比在这个全新的站点受欢迎更好的事了。 Twitter如果你仍然认为Twitter只是一个提供给小女孩讨论关于贾斯汀比伯发烧友的推文的地方的话，或许你这么想也是对的，但除此之外，软件开发者在这里分享 他们一些有趣的产品和最新的趣闻。Twitter是我了解新闻的汇集地，如果有看到同样的故事被多个人推送，通常我会进一步研究，如果你关注对了人的话， 推文无疑是一种很重要的保持联系地方式。 Blog现在估计你会说”疯了吧,我不想拥有博客，我不是那种喜欢分享一切甚至将来死了还希望能有一部电影是写关于自己的时髦人。虽然博客是有特定类型的人做白日 梦的地方，但它仍然允许你分享一些很酷的东西。这是记录你作为程序员生涯和人类生存的整个过程，甚至能够为你的未来开启一扇大门。 Github你的代码保存在硬盘上不让任何人使用那将会发生什么事情呢？它永远也不会被运行或者用于其他用途，在我的思维中这是一种彻彻底底的失败，上Guthub,把你的代码免费公开出来，同时是一种学习新事物的好方法，现在就选择一门熟悉的语言开始阅读吧。 Stackoverflow你是属于那种问一大堆问题然后期待答案的那类人吗？Stackoverflow这个最优秀的Q&A站点开始出现在网络上，它有各种姊妹站点，想知道更多关于食谱、编码、Ubuntu、或者即使是新事物。这里有海量的知识库，我推荐给任何想知道更多东西的开发者。 HackerNews你有想过大批聪明的开发者愿意发送技术文章和趣事链接到新闻站点上吗？准备一天花费一小时轻松点击刷新，赶紧检查下吧。 Reddit现在你可能认为Reddit主要是用于查找有关猫的一些趣图和利用人性弱点制造娱乐的地方，然而有大批的开发者开始在讨论各种搞破坏的开发，在subreddit还能找到更多的方法。 CoderWall我知道我说了7种但是不能遗漏coderwall,我们喜欢竞争,记录一些成就，CoderWall为我们提供了这样的平台。他们最近发布一个新的描述页面，看起来很棒，试试吧。 原文：Mahdi Yusuf 编译：伯乐在线 –刘志军
View Details