.NET远程异常：权限被拒绝：无法远程调用非公共或静态方法 [英] .NET remoting exception: Permission denied: cannot call non-public or static methods remotely

问题描述

我正在写一个程序，这将使装载特定的管理.dll文件并使用它。因为我要卸载该.dll文件的能力，我创建了两个应用程序域 - 一个用于应用程序本身，另一个用于当前加载.DLL

I'm writing a program which will allow to load a specific managed .DLL file and play with it. Since I want the ability to unload the .DLL file, I'm creating two AppDomains - one for the app itself, the other for the currently loaded .DLL.

由于大部分在加载.DLL对象不序列化好，我创建一个 MarshalByRefObject的包装类，这将使物体本身在其自己的AppDomain，并揭露一些反射功能的主要应用程序的AppDomain。

Since most of the objects in the loaded .DLL do not serialize well, I'm creating a MarshalByRefObject wrapper class which will keep the object itself in its own AppDomain, and expose some reflection functions to the main application AppDomain.

然而，当我尝试远程对象我无法摆脱异常的调用方法：

However when I try to invoke a method on the remote object I get stuck with an exception:

权限被拒绝：无法远程调用非公共或静态方法

Permission denied: cannot call non-public or static methods remotely.

这是很奇怪的，因为我没有使用任何非公共或静态方法的。从本质上讲，我拥有的是：

This is very strange, because I'm not using any non-public or static methods at all. In essence, what I have is:

class RemoteObjectWrapper: MarshalByRefObject
{
    private Type SourceType;
    private object Source;

    public RemoteObjectWrapper(object source)
    {
        if (source == null)
            throw new ArgumentNullException("source");
        this.Source = source;
        this.SourceType = source.GetType();
    }
    public T WrapValue<T>(object value)
    {
        if ( value == null )
            return default(T);
        var TType = typeof(T);
        if (TType == typeof(RemoteObjectWrapper))
            value = new RemoteObjectWrapper(value);
        return (T)value;
    }
    public T InvokeMethod<T>(string methodName, params object[] args)
    {
        return WrapValue<T>(SourceType.InvokeMember(methodName,
            System.Reflection.BindingFlags.FlattenHierarchy | System.Reflection.BindingFlags.Instance |
            System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Public, null, this.Source, args));

    }
}

和我得到的异常，当我尝试这样做：

And I get the exception when I try to do:

var c = SomeInstanceOfRemoteObjectWrapper.InvokeMethod<RemoteObjectWrapper>("somePublicMethod", "some string parameter");

这是怎么回事呢？据我可以理解，在的InvokeMethod 方法甚至没有得到执行，当我尝试运行它的异常。

What's going on here? As far as I can understand, the InvokeMethod method doesn't even get executed, the exception is thrown when I try to run it.

补充：为了澄清 - SomeInstanceOfRemoteObjectWrapper 是建于.DLL的AppDomain中，然后回到我的主要的AppDomain中，的InvokeMethod＆LT; T＆GT;（）是我的主要的AppDomain叫（我期望它在.DLL的AppDomain中执行）

Added: To clarify - SomeInstanceOfRemoteObjectWrapper is constructed in the .DLL's AppDomain and then returned to my main AppDomain, The InvokeMethod<T>() is called from my main AppDomain (and I expect it to execute in the .DLL's AppDomain).

推荐答案

连方法的InvokeMethod＆LT; T＆GT; 是公开的，并且包含一个内部类中。在C＃中没有修改使其内部。因此，的InvokeMethod＆LT的有效可视性; T＆GT; 是内部的，你所得到的例外。制作 RemoteObjectWrapper 公众应该解决这个问题。

Even the method InvokeMethod<T> is public it is contained within an internal class. No modifier in C# makes it internal. Hence the effective visibility of InvokeMethod<T> is internal and you are getting the exception. Making RemoteObjectWrapper public should fix this problem.

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