c#动态加载dll文件

2022-10-30 18:51:46

1.在写一个记录日志到文件中的类库（生成dll文件copy到一个目录中去，然后在主函数的appconfig中去配置。

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace WriteToTxtLib

{

    public class WriteLog

    {

        public void Write(string logMessage)

        {

            using (StreamWriter sw =  new StreamWriter("e:\\test\\writelog.txt",true))

            {

                sw.WriteLine(DateTime.Now.ToLongDateString() + logMessage);

            }

        }

    }

}

2.新建一个测试的主函数，其中appconfig进行如下配置

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

    <startup>

        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />

    </startup>

  <appSettings>

    <add key="dllNamespaceName" value="WriteToWordLib"/>

    <add key="dllClassName" value="WriteLog"/>

    <add key="dllMethodName" value="Write"/>

    <add key="dllPath" value="e:\test\WriteToWordLib.dll"/>

  </appSettings>

</configuration>

3.给主函数添加如下代码

using System;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.Configuration;

using System.Linq;

using System.Management.Instrumentation;

using System.Reflection;

using System.Text;

using System.Threading.Tasks;

using System.Configuration;

using System.Data;

using System.Drawing;

using System.Text;

using System.IO;

using System.Collections;

using System.Configuration;

namespace 我的日志功能函数

{

    class Program

    {

        static void Main(string[] args)

        {

            WriteLog("主函数开始");

            Console.ReadKey();

        }

        private static void WriteLog(string logMessage)

        {

            /*

             * 这是appconfig文件中的指定的内容

                <add key="dllNamespaceName" value="WriteToTxtLib"/>

                <add key="dllClassName" value="WriteLog"/>

                <add key="dllMethodName" value="Write"/>

                <add key="dllPath" value="e:\\test\WriteToTxtLib.dll"/>

             */

            //获取到命名空间,类名，方法名，dll路径

            string dllNamespaceName = System.Configuration.ConfigurationSettings.AppSettings["dllNamespaceName"].ToString();

            string dllClassName = System.Configuration.ConfigurationSettings.AppSettings["dllClassName"].ToString();

            string dllMethodName = System.Configuration.ConfigurationSettings.AppSettings["dllMethodName"].ToString();

            string dllPath = System.Configuration.ConfigurationSettings.AppSettings["dllPath"].ToString();

            Assembly asm = Assembly.LoadFile(dllPath);//加载dll

            Type classType = asm.GetType(dllNamespaceName + "." + dllClassName);//获取类型

            object obj = Activator.CreateInstance(classType);//根据类型创建对象

            MethodInfo method = classType.GetMethod(dllMethodName);//找到指定的方法

            object o = method.Invoke(obj, new object[] { logMessage });//调用方法

        }

    }

}

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