“System.IO.FileNotFoundException:“Could not load file or assembly 'ClassLibrary2, Culture=neutral, PublicKeyToken=null'. 系统找不到指定的文件。”” 在 .net 程序开发中我们会经常用到反射，最近在开始慢慢接触 .netCore。Core 反射的语法也是一样的，所以写下来也没有什么问题，但是一运行，就弹出了开头的 异常。 项目结构如下 ClassLibrary3 是一个接口
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namespace ClassLibrary3 { public interface IClass1 { void Print(); } } |
ClassLibrary2 是 ClassLibrary3 的实现
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namespace ClassLibrary2 { public class Class1:IClass1 { public void Print() { Console.WriteLine("Print....."); } } } |
主程序通过反射获取到到类型并创建对象
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class Program { static void Main(string[] args) { Console.WriteLine("Hello World!"); Assembly assembly = Assembly.Load(new AssemblyName("ClassLibrary2")); Type type = assembly.GetType("ClassLibrary2.Class1"); var instance = (IClass1)Activator.CreateInstance(type); instance.Print(); Console.ReadLine(); } } |
这代码都这里没有问题，但是执行的时候却抛出了 开篇的异常。仔细检查了下，ClassLibrary2 生成的 dll 确认已经是复制到了主程序目录下。 刚开始接触Core 也没有系统去熟悉，最后经过多方努力后，发现在主程序项目下有个 deps.json 的文件 文件内容是这样的（里面没有 ClassLibrary2 因为我们没有在项目中引用 ClassLibrary2） 然后想着 那异常提示找不到路径，那我们在这里配置下不久可以了？ 然后改成如下： 这时候我们运行程序： 完美！ from:https://www.cnblogs.com/mengtree/p/7139108.html
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/// <summary> /// 替换SQL注入的危险字符 /// </summary> /// <param name="param"></param> /// <returns></returns> public static string ReplaceInjectString(string param) { if (string.IsNullOrEmpty(param)) return string.Empty; var result = new StringBuilder(param); return result .Replace("'", "'") .Replace(",", ",") .Replace(";", ";") .Replace("(", "(") .Replace("=", "=") .Replace("*", "*") .Replace("&", "&") .ToString(); } |
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NuGet默认的全局包下载地址一般为:C:\Users\{username}\.nuget\packages 修改方法：
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<?xml version="1.0" encoding="utf-8"?> <configuration> <packageSources> <add key="Microsoft Visual Studio Offline Packages" value="C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\"/> </packageSources> <config> <add key="globalPackagesFolder" value="D:\Nuget\.nuget\packages" /> </config> </configuration> |
from:https://www.cnblogs.com/sword88/p/11490304.html
View Details1.下载 2.使用例子 Demo 概述：Quartz 是开源的定时任务工具类，默认每隔10秒执行一次任务，相当于C#的Timer，不断的循环执行（Start 方法），也可以随时停止（ShutDown方法）。 一 下载 下载地址：quartz 二 使用例子 Demo 1）引入程序集，必须引入三个，不然报错 2）IScheduler 和 IJob
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public class Myjob : IJob { public const string DelayTime = "delay time"; public void Execute(IJobExecutionContext context) { string key = "quartzKeyCache"; if (System.Web.HttpRuntime.Cache[key] != null) { var temp = (int)System.Web.HttpRuntime.Cache[key]; System.Web.HttpRuntime.Cache[key] = temp + 1; } else { System.Web.HttpRuntime.Cache[key] = 1; } } } |
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public class QuartzUlity { public static IScheduler sched; public static void Open() { ISchedulerFactory schedf = new StdSchedulerFactory(); sched = schedf.GetScheduler(); IJobDetail job = JobBuilder.Create<Myjob>().Build(); ITrigger trigger = (ITrigger)TriggerBuilder.Create().WithCronSchedule("/10 * * * * ?").Build(); sched.ScheduleJob(job, trigger); sched.Start(); } public static void Close() { sched.Shutdown(true); } } |
3）每隔10秒，修改一次缓存的值，可以打断点随时查看缓存里的实时值。 from:https://www.cnblogs.com/ligenyun/p/7729989.html
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public HttpResponseMessage ImportTemplate(string fileName) { var context = HttpContext.Current; var response = new HttpResponseMessage(HttpStatusCode.OK); var path = context.Server.MapPath("~/App_Data/" + fileName); if (string.IsNullOrEmpty(fileName) || !File.Exists(path)) { response = new HttpResponseMessage(HttpStatusCode.NotFound) { Content = new StringContent($"<meta charset=\"utf-8\"><h3>【{fileName}】不存在。</h3>", Encoding.UTF8) }; response.Content.Headers.ContentType = new MediaTypeHeaderValue("text/html"); return response; } var stream = new FileStream(path, FileMode.Open, FileAccess.Read); response.Content = new StreamContent(stream); response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream"); response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = HttpUtility.UrlEncode(fileName) }; response.Headers.Add("Access-Control-Expose-Headers", "FileName"); response.Headers.Add("FileName", HttpUtility.UrlEncode(fileName)); return response; } |
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我遇到了 Your project is not referencing the “.NETFramework,Version=4.5” framework. Add a reference to “.NETFramework,Version=4.5” in the “frameworks” section of your project.json, and then re-run NuGet restore. 怎么弄都没法解决，我尝试了git撤销更改也无法解决，最后解决方法：删除/obj文件。 来自stackoverflow ———————————————— 版权声明：本文为CSDN博主「迷惘小书童」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。 原文链接：https://blog.csdn.net/m0_37080285/article/details/90206495
View Details以我们家庭好医.netcore项目做个示例，来看看怎么进一步优化Docker镜像的大小。 这里以先编译再做镜像的方法为示例，当然你也可以把编译部分也写进Dockerfile里。 0.先来看看编译后的项目文件大小：39.2MB 1.先看一下VS2019默认Dockerfile生成的镜像 先上Dockerfile
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FROM mcr.microsoft.com/dotnet/aspnet:3.1 AS base WORKDIR /app EXPOSE 5000 FROM base AS final WORKDIR /app COPY . . ENTRYPOINT ["dotnet", "JTHY.Web.dll"] |
看看生成的镜像大小：265MB 2.用大家常用的slim镜像试试 Dockerfile
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FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base WORKDIR /app EXPOSE 5000 FROM base AS final WORKDIR /app COPY /. /app ENTRYPOINT ["dotnet", "JTHY.Web.dll"] |
镜像大小还是265MB，并没有变小。 3.用大家不常用的alpine镜像来优化 Dockerfile
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ROM mcr.microsoft.com/dotnet/aspnet:3.1-alpine AS base WORKDIR /app EXPOSE 5000 FROM base AS final WORKDIR /app COPY /. /app ENTRYPOINT ["dotnet", "JTHY.Web.dll"] |
再来看看镜像大小：146MB，是不是很神奇~
View Details在EntityFrameworkCore项目下移除包Microsoft.EntityFrameworkCore.SqlServer 在EntityFrameworkCore项目下添加包Pomelo.EntityFrameworkCore.MySql v3.2.4 修改xxxDbContextConfigurer中的 删除EntityFraweorkCore下面的迁移文件夹 EntityFraweorkCore和WebHost的appsettings.json
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"ConnectionStrings": { "Default": "server=127.0.0.1;database=abp;uid=root;pwd=123456;charset=utf8mb4;" }, |
添加数据迁移VS菜单：Tools -> NuGet Package Manager -> Package Manager Console运行以下命令：
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Add-Migration DbName |
Update-Database Remove-Migration from:https://blog.csdn.net/qq_40353040/article/details/108770993
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using System; using System.Collections.Generic; using System.Configuration; using MySql.Data.MySqlClient; using System.Data; namespace Utils { /// <summary> /// MySQL数据库工具类 /// </summary> public abstract class MySQLUtil { /// <summary> /// 数据库连接字符串 /// </summary> public static readonly string ConnStr = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString; /// <summary> /// 执行语句并返回影响的行数 /// </summary> /// <param name="connStr">数据库连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>影响的行数</returns> public static int ExecuteNonQuery(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var conn = new MySqlConnection(connStr)) { return ExecuteNonQuery(conn, cmdType, cmdText, parameters); } } /// <summary> /// 执行语句并返回影响的行数 /// </summary> /// <param name="conn">数据库连接</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>影响的行数</returns> public static int ExecuteNonQuery(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var cmd = new MySqlCommand()) { PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters); var val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } } /// <summary> /// 执行语句并返回影响的行数 /// </summary> /// <param name="trans">事务</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>影响的行数</returns> public static int ExecuteNonQuery(MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var cmd = new MySqlCommand()) { PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, parameters); var val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } } /// <summary> /// 执行语句并返回DataReader对象 /// </summary> /// <param name="connStr">数据库连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>执行语句并返回DataReader对象</returns> /// <remarks>P.S：DataReader使用后要手动释放</remarks> public static MySqlDataReader ExecuteReader(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { var cmd = new MySqlCommand(); var conn = new MySqlConnection(connStr); try { PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters); var dr = cmd.ExecuteReader(CommandBehavior.CloseConnection); cmd.Parameters.Clear(); return dr; } catch { conn.Close(); throw; } } /// <summary> /// 执行语句并返回DataSet对象 /// </summary> /// <param name="cmdText"></param> /// <param name="parameters"></param> /// <returns></returns> public static DataSet ExecuteDataSet(string cmdText, params MySqlParameter[] parameters) { return ExecuteDataSet(ConnStr, CommandType.Text, cmdText, parameters); } /// <summary> /// 执行语句并返回DataSet对象 /// </summary> /// <param name="connStr">数据库连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>执行语句并返回DataSet对象</returns> /// <returns></returns> public static DataSet ExecuteDataSet(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var conn = new MySqlConnection(connStr)) { return ExecuteDataSet(conn, cmdType, cmdText, parameters); } } /// <summary> /// 执行语句并返回DataSet对象 /// </summary> /// <param name="connStr">数据库连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>执行语句并返回DataSet对象</returns> /// <returns></returns> public static DataSet ExecuteDataSet(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var cmd = new MySqlCommand()) { PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters); using (var da = new MySqlDataAdapter(cmd)) { var ds = new DataSet(); try { da.Fill(ds, "ds"); cmd.Parameters.Clear(); } catch (MySqlException ex) { throw new Exception(ex.Message); } return ds; } } } /// <summary> /// 执行语句并返回一个对象 /// </summary> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>返回一个object对象，对象中只包含一列。</returns> public static object ExecuteScalar(string cmdText, params MySqlParameter[] parameters) { return ExecuteScalar(ConnStr, CommandType.Text, cmdText, parameters); } /// <summary> /// 执行语句并返回一个对象 /// </summary> /// <param name="connStr">数据库连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>返回一个object对象，对象中只包含一列。</returns> public static object ExecuteScalar(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var conn = new MySqlConnection(connStr)) { return ExecuteScalar(conn, cmdType, cmdText, parameters); } } /// <summary> /// 执行语句并返回一个对象 /// </summary> /// <param name="conn">数据库连接</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>返回一个object对象，对象中只包含一列。</returns> public static object ExecuteScalar(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var cmd = new MySqlCommand()) { PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters); var val = cmd.ExecuteScalar(); cmd.Parameters.Clear(); return val; } } /// <summary> /// 为执行准备命令对象 /// </summary> /// <param name="cmd">command 对象</param> /// <param name="conn">连接对象</param> /// <param name="trans">事务对象</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="cmdParms">参数集</param> private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, CommandType cmdType, string cmdText, IEnumerable<MySqlParameter> parameters) { if (conn.State != ConnectionState.Open) conn.Open(); cmd.Connection = conn; cmd.CommandText = cmdText; if (trans != null) cmd.Transaction = trans; cmd.CommandType = cmdType; if (parameters == null) return; foreach (var parm in parameters) cmd.Parameters.Add(parm); } } } |
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