FileNotFound，当通过反射从加载的程序集中返回Types[]时

我正在尝试加载一个加载项程序集（放置在

D： ''xyz''addin.dll

当我的应用程序在中时

D： ''MyApp''MyApp.exe

这样addin文件就不应该被锁定，以便在应用程序运行时可以再次复制它的新版本。为此，我创建了新的应用程序域，并加载了包含AssetLoader类的通用dll，然后调用AssemblyLoader加载加载项并获取其中所有可用的类型。加载项dll的依赖项已经放在同一文件夹中。现在从addin dll获取类型工作正常，但当我

返回组件。GetTypes（）；

一件非常奇怪的事情发生了。它执行该行，但在该函数退出时抛出异常"d:''xyz''addin.dll"FileNotFound

public class ObjectLoader : IDisposable
{
    public Type[] GetAllTypesFromAssembly(string filePath)
    {
        AppDomainSetup setup = new AppDomainSetup();
        setup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;
        setup.ShadowCopyFiles = "true";
        Evidence adevidence = AppDomain.CurrentDomain.Evidence;
        AssemblyLoader asemblyLoader = null;
        AppDomain appDomain = AppDomain.CreateDomain(filePath, adevidence, setup);
        appDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
        domains.Add(filePath, appDomain);
        object[] parms = { filePath };
        BindingFlags bindings = BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.Public;
        try
        {
            asemblyLoader = (AssemblyLoader)appDomain.CreateInstanceFromAndUnwrap(
            setup.ApplicationBase +
            "Common.dll", "Common.AssemblyLoader", 
            true, bindings, null, parms, null, null, null
            );
        }
        catch (Exception ex)
        {
            throw ex; // new AssemblyLoadFailureException();
        }
        object types = null;
        if (asemblyLoader != null)
        {
            // On following line i am facing the error which occur on following line but when GetAllTypes exits. 
            types = asemblyLoader.GetAllTypes();
         }
         return (Type[])types;
     }
}
internal class AssemblyLoader : MarshalByRefObject, IDisposable
{
    private Assembly assembly = null;
    public object GetAllTypes()
    {
        BindingFlags flags = BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.Public;
        object types = null;
        if (assembly != null)
        {
            try
            {
                // following line works fine and loads a type (it contains one class)
                types = assembly.GetTypes(); 
            }
            catch (Exception)
            {
                types = new ObjectLoadFailureException();
            }
        }
        else
        {
            types = new AssemblyNotLoadedException();
        }
        return types;
    }
}

以下是异常详细信息：

System.IO.FileNotFoundException was unhandled
HResult=-2147024894
Message=Could not load file or assembly 'AddIn, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
  Source=mscorlib
  FileName=AddIn, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
  FusionLog==== Pre-bind state information ===
LOG: DisplayName = AddIn, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
 (Fully-specified)
LOG: Appbase = file:///D:/MyApp/
LOG: Initial PrivatePath = NULL
Calling assembly : (Unknown).

如果我在D:''xyz''和D:''MyApp''中复制我的addin.dll，则没有错误。我在运行时环境中无法做到这一点。