c# 用代碼來設置程序的PrivatePath

有時候我們想讓程序的exe文件和dll文件分開在不同目錄，這時候可以有3種方法

1.在app.config中配置

<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來設置

3.new AppDomainSetup().PrivateBinPath 來設置

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;
 }

可有時候又不想把他放在config文件上，只想用代碼來實現，第二中方法發現已經過期，第三種方法MSDN語焉不詳的，網上也沒有什麼資料，目前就用第四種方法

4.AppDomain有個AssemblyResolve事件，加載dll失敗的時候觸發，可以在這個事件裏面處理

AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;

/// <summary>
        /// 對外解析dll失敗時調用
        /// </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);
        }