MSDN原文：https://msdn.microsoft.com/library/twy1dw1e(v=vs.100).aspx

<runtime> 的 <assemblyBinding> 元素

.NET Framework 4        

其他版本

• .NET Framework (current version)
• .NET Framework 3.5
• .NET Framework 3.0
• .NET Framework 2.0

包含有关程序集版本重定向和程序集位置的信息。

复制

<assemblyBinding  
   xmlns="urn:schemas-microsoft-com:asm.v1" appliesTo="v1.0.3705">
</assemblyBinding>

特性和元素

以下几节描述了属性、子元素和父元素。

特性

子元素

父元素

示例

下面的示例显示如何将一个程序集版本重定向到另一个版本并提供基本代码。

<configuration>
   <runtime>
      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
         <dependentAssembly>
            <assemblyIdentity name="myAssembly"
                              publicKeyToken="32ab4ba45e0a69a1"
                              culture="neutral" />
            <bindingRedirect oldVersion="1.0.0.0"
                             newVersion="2.0.0.0"/>
            <codeBase version="2.0.0.0"
                      href="http://www.litwareinc.com/myAssembly.dll"/>
         </dependentAssembly>
      </assemblyBinding>
   </runtime>
</configuration>

下面的示例显示如何使用 appliesTo 特性重定向 .NET Framework 程序集绑定。

<runtime>
   <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1" appliesTo="v1.0.3705">
      <dependentAssembly>
         <assemblyIdentity name="mscorcfg" publicKeyToken="b03f5f7f11d50a3a" culture=""/>
         <bindingRedirect oldVersion="0.0.0.0-65535.65535.65535.65535" newVersion="1.0.3300.0"/>
      </dependentAssembly>
   </assemblyBinding>
</runtime

exe文件和dll文件分开在不同目录，这时候可以有3种方法

1.在app.config中配置

1. <runtime>
2. <gcConcurrent enabled="true" />
3. <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
4. <publisherPolicy apply="yes" />
5. <probing privatePath="32;64" />
6. </assemblyBinding>
7. </runtime>

<runtime>
    <gcConcurrent enabled="true" />
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <publisherPolicy apply="yes" />
      <probing privatePath="32;64" />
    </assemblyBinding>
  </runtime>

2. AppDomain.CurrentDomain.AppendPrivatePath来设置

3.new AppDomainSetup().PrivateBinPath 来设置

1. if (AppDomain.CurrentDomain.IsDefaultAppDomain())
2. {
3. string appName = AppDomain.CurrentDomain.FriendlyName;
4. var currentAssembly = Assembly.GetExecutingAssembly();
5. AppDomainSetup setup = new AppDomainSetup();
6. setup.ApplicationBase = System.Environment.CurrentDirectory;
7. setup.PrivateBinPath = "Libs";
8. setup.ConfigurationFile = setup.ApplicationBase +
9. string.Format("\\Config\\{0}.config", appName);
10. AppDomain newDomain = AppDomain.CreateDomain("NewAppDomain", null, setup);
11. int ret = newDomain.ExecuteAssemblyByName(currentAssembly.FullName, e.Args);
12. AppDomain.Unload(newDomain);
13. Environment.ExitCode = ret;
14. Environment.Exit(0);
15. return;
16. }

           if (AppDomain.CurrentDomain.IsDefaultAppDomain())
            {
                string appName = AppDomain.CurrentDomain.FriendlyName;
                var currentAssembly = Assembly.GetExecutingAssembly();
                AppDomainSetup setup = new AppDomainSetup();
                setup.ApplicationBase = System.Environment.CurrentDirectory;
                setup.PrivateBinPath = "Libs";
                setup.ConfigurationFile = setup.ApplicationBase +
                                    string.Format("\\Config\\{0}.config", appName);
                AppDomain newDomain = AppDomain.CreateDomain("NewAppDomain", null, setup);
                int ret = newDomain.ExecuteAssemblyByName(currentAssembly.FullName, e.Args);
                AppDomain.Unload(newDomain);
                Environment.ExitCode = ret;
                Environment.Exit(0);
                return;
            }

可有时候又不想把他放在config文件上，只想用代码来实现，第二中方法发现已经过期，第三种方法MSDN语焉不详的，网上也没有什么资料，目前就用第四种方法

4.AppDomain有个AssemblyResolve事件，加载dll失败的时候触发，可以在这个事件里面处理

1. AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;

AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;

1. /// <summary>
2. /// 对外解析dll失败时调用
3. /// </summary>
4. /// <param name="sender"></param>
5. /// <param name="args"></param>
6. /// <returns></returns>
7. static System.Reflection.Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
8. {
9. string path = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Libs\");
10. path = System.IO.Path.Combine(path, args.Name.Split(‘,‘)[0]);
11. path = String.Format(@"{0}.dll", path);
12. return System.Reflection.Assembly.LoadFrom(path);
13. }

/// <summary>
        /// 对外解析dll失败时调用
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="args"></param>
        /// <returns></returns>
        static System.Reflection.Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
        {
            string path = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Libs\");
            path = System.IO.Path.Combine(path, args.Name.Split(‘,‘)[0]);
            path = String.Format(@"{0}.dll", path);
            return System.Reflection.Assembly.LoadFrom(path);
        }