c# - AppDomain DoCallBack FileNotFound 异常

Question

我将一个函数加载到新创建的 AppDomain 并且一切正常，但是如果我关闭程序然后重命名它并再次启动它，那么我将遇到 FileNotFound 异常。我只是不明白，怎么可能？

错误(appDomainProject原程序名)

System.IO.FileNotFoundException: Could not load file or assembly "appDomainProject, Version = 1.0.0.0, Culture = neutral, PublicKeyToken = null" or one of its dependencies. Can not find the file specified.

来源

using System;
using System.IO;
using System.Windows.Forms;

namespace appDomainProject
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            try
            {
                AppDomain authDomain = AppDomain.CreateDomain(DateTime.Now.ToString());
                authDomain.DoCallBack(load_Auth);
            }
            catch (Exception ex)
            {
                File.WriteAllText("e.txt", ex.ToString());;
                MessageBox.Show(ex.ToString());
            }
        }

        private static void load_Auth()
        {
            MessageBox.Show("AUTH");
        }
    }
}

Answer 1

我猜 exe 有一些关于它们的硬编码名称。事实上，如果您检查 typeof(Program).AssemblyName，它就是原始名称，这就是我认为我们会收到错误的原因。

但是，您始终可以手动将 dll 加载到 AppDomain 中，然后在其中放置一些类来拦截对“原始”名称的请求并将其替换为正确的程序集。

这段代码是这样做的:

/// <summary>
///  It seems that if you rename an exe and then try to load said 
///  assembly into a separate app-domain, .NET looks for the original
///  name.  This class loads the current assembly into the app
///  domain manually and then detects request for the original name 
///  and redirects it to the correct assembly.
/// 
///  http://stackoverflow.com/questions/37685180
/// </summary>
public class RenamedExeFixer : MarshalByRefObject
{
  /// <summary> Load the assembly that this type is in into the app-domain. </summary>
  public static void LoadOriginatingAssemblyIntoDomain(AppDomain appDomain)
  {
    var pathToSelf = new Uri(typeof(RenamedExeFixer).Assembly.CodeBase).LocalPath;
    appDomain.Load(File.ReadAllBytes(pathToSelf));

    // create an instance of the class inside of the domain
    // so that it can hook into the AssemblyResolve event
    appDomain.CreateInstanceFrom(pathToSelf, typeof(RenamedExeFixer).FullName);
  }

  private readonly string _myAssemblyName;

  public RenamedExeFixer()
  {
    // cached for efficiency (probably not needed)
    _myAssemblyName = typeof(RenamedExeFixer).Assembly.FullName;

    AppDomain.CurrentDomain.AssemblyResolve += HandleAssemblyResolve;
  }

  private Assembly HandleAssemblyResolve(object sender, ResolveEventArgs args)
  {
    if (args.Name == _myAssemblyName)
    {
      return typeof(RenamedExeFixer).Assembly;
    }

    return null;
  }
}

然后您需要做的就是在创建您的应用程序域后调用辅助方法:

AppDomain authDomain = AppDomain.CreateDomain(DateTime.Now.ToString());
RenamedExeFixer.LoadOriginatingAssemblyIntoDomain(authDomain);
authDomain.DoCallBack(load_Auth);