Question

我需要采用一种通过现实程序进行辩驳的方法。我把这个问题孤立到以下法典中:

using System;
using System.Reflection;
using System.Runtime.Remoting.Messaging;
using System.Runtime.Remoting.Proxies;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
             HelloClass hello=new HelloClass();
             TestProxy proxy = new TestProxy(hello);
             HelloClass hello2 = proxy.GetTransparentProxy() as HelloClass;

             string t = "";
             hello2.SayHello(ref t);
             Console.Out.WriteLine(t);
        }
    }

    public class TestProxy : RealProxy
    {
         HelloClass _hello;

         public TestProxy(HelloClass hello)
             : base(typeof(HelloClass))
         {
             this._hello = hello;
         }

         public override System.Runtime.Remoting.Messaging.IMessage Invoke(System.Runtime.Remoting.Messaging.IMessage msg)
        {
            IMethodCallMessage call = msg as IMethodCallMessage;
            object returnValue = typeof(HelloClass).InvokeMember(call.MethodName, BindingFlags.InvokeMethod | BindingFlags.Public | BindingFlags.Instance, null, _hello, call.Args);
            return new ReturnMessage(returnValue, null, 0, call.LogicalCallContext, call);
        }
    }

    public class HelloClass : MarshalByRefObject
    {
        public void SayHello(ref string s)
        {
            s = "Hello World!";
        }
    }
}

该方案应产生“Hello World”产出,但在某种程度上,替代论点的修改在代理中消失。我必须做些什么才能做到这一点?

Answer 1

回返的第二个参数需要包含回归的价值观,并排除参数以回去。你们可以通过在以下几处提及你所穿的阵列来实现:

public override System.Runtime.Remoting.Messaging.IMessage Invoke(System.Runtime.Remoting.Messaging.IMessage msg)
{
    IMethodCallMessage call = msg as IMethodCallMessage;
    var args = call.Args;
    object returnValue = typeof(HelloClass).InvokeMember(call.MethodName, BindingFlags.InvokeMethod | BindingFlags.Public | BindingFlags.Instance, null, _hello, args);
    return new ReturnMessage(returnValue, args, args.Length, call.LogicalCallContext, call);
}

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