加载DLL的AppDomain代码在VB中工作但在C＃中不能工作

Question

前段时间，我在VB中编写了一个程序（称为QueryViewer），作为其中的一部分，将dll加载到新的应用程序域并成功执行它们。我已经转移到C＃并将这个程序从VB转换为C＃但是我从来没有能够得到我认为正确转换的C＃例程。它始终在appdomain.CreateInstanceAndUnwrap调用上失败，即使这段代码（在VB中）也能正常工作。

这是原始的VB代码：

Imports System.Reflection
Imports System.Security
Imports System.Security.Policy
Imports System.Security.Permissions

Public Class ClassLocalLoader
    Inherits MarshalByRefObject

    Private _appDomain As AppDomain
    Private _clsRemoteLoader As classRemoteLoader

    Public Sub New()

        Dim strAsmName As String
        Dim adSetup As AppDomainSetup

        Try

            strAsmName = [Assembly].GetExecutingAssembly.GetName.Name

            adSetup = New AppDomainSetup()
            adSetup.ApplicationName = "Plugin"
            adSetup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory

            Dim permSet As PermissionSet = New PermissionSet(PermissionState.None)
            permSet.AddPermission(New SecurityPermission(SecurityPermissionFlag.AllFlags))

            Dim ev As Evidence = New Evidence()
            ev.AddHostEvidence(New Zone(SecurityZone.MyComputer))

            permSet = SecurityManager.GetStandardSandbox(ev)

            _appDomain = AppDomain.CreateDomain("Plugin", Nothing, adSetup, permSet, New StrongName() {})

            _clsRemoteLoader = CType(_appDomain.CreateInstanceAndUnwrap(strAsmName, strAsmName & ".ClassRemoteLoader"), classRemoteLoader)

        Catch logerrorex As Exception When TCA.Display.ShowLine(logerrorex)

        Catch ex As Exception

        End Try

    End Sub

    Public Sub LoadAssembly(ByVal strFilename As String)

        _clsRemoteLoader.LoadAssembly(strFilename)

    End Sub

    Public Function CreateInstance(ByVal bindingFlags As BindingFlags, ByVal constructorParams As Object()) As MarshalByRefObject

        Return _clsRemoteLoader.CreateInstance(bindingFlags, constructorParams)

    End Function

    Public Sub Unload()

        If _appDomain IsNot Nothing Then

            AppDomain.Unload(_appDomain)
            _appDomain = Nothing

        End If

    End Sub

End Class

现在，转换后的C＃代码不是：

using System;
using System.Reflection;
using System.Security;
using System.Security.Permissions;
using System.Security.Policy;
using KellermanSoftware.NetLoggingLibrary;

public class ClassLocalLoader : MarshalByRefObject
{
    private AppDomain _appDomain;
    private ClassRemoteLoader _classRemoteLoader;

    public ClassLocalLoader()
    {
        try
        {
            String asmName = Assembly.GetExecutingAssembly().GetName().Name;

            var adSetup = new AppDomainSetup
            {
                ApplicationName = "Plugin",
                ApplicationBase = AppDomain.CurrentDomain.BaseDirectory
            };

            PermissionSet permSet = new PermissionSet(PermissionState.None);
            permSet.AddPermission(new SecurityPermission(SecurityPermissionFlag.AllFlags));

            Evidence ev = new Evidence();
            ev.AddHostEvidence(new Zone(SecurityZone.MyComputer));

            permSet = SecurityManager.GetStandardSandbox(ev);
            if (permSet != null)
            {
                _appDomain = AppDomain.CreateDomain("Plugin", null, adSetup, permSet);
                _classRemoteLoader = (ClassRemoteLoader)_appDomain.CreateInstanceAndUnwrap(asmName, asmName + ".ClassRemoteLoader");
            }
        }
        catch (Exception ex)
        {
            Log.LogExceptionEx(ex, "Exception raised while trying to load plugin.");
        }
    }

    public void LoadAssembly(string filename)
    {
        Assembly.LoadFrom(filename);
    }

    public MarshalByRefObject CreateInstance(BindingFlags bindingFlags, Object[] constructorParams)
    {
        return _classRemoteLoader.CreateInstance(bindingFlags, constructorParams);
    }

    public void Unload()
    {
        if (_appDomain != null)
        {
            AppDomain.Unload(_appDomain);
            _appDomain = null;

        }
    }
}

C＃代码失败，出现以下错误：

无法从程序集“QueryViewer，Version = 1.4.0.0，Culture = neutral，PublicKeyToken = null”加载类型“QueryViewer.ClassRemoteLoader”。

导致失败的调用如下：

    classLocalLoader = new ClassLocalLoader();

任何人都认为我转换的C＃例程有什么问题会导致这种情况失败？

谢谢， 唐B。