c#动态加载卸载DLL的方法

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Threading; 
using System.Reflection; 
namespace UnloadDll 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            string callingDomainName = AppDomain.CurrentDomain.FriendlyName;//Thread.GetDomain().FriendlyName; 
            Console.WriteLine(callingDomainName); 
            AppDomain ad = AppDomain.CreateDomain("DLL Unload test"); 
            ProxyObject obj = (ProxyObject)ad.CreateInstanceFromAndUnwrap(@"UnloadDll.exe", "UnloadDll.ProxyObject"); 
            obj.LoadAssembly(); 
            obj.Invoke("TestDll.Class1", "Test", "It's a test"); 
            AppDomain.Unload(ad); 
            obj = null; 
            Console.ReadLine(); 
        } 
    } 
    class ProxyObject : MarshalByRefObject 
    { 
        Assembly assembly = null; 
        public void LoadAssembly() 
        { 
            assembly = Assembly.LoadFile(@"TestDLL.dll");            
        } 
        public bool Invoke(string fullClassName, string methodName, params Object[] args) 
        { 
            if(assembly == null) 
                return false; 
            Type tp = assembly.GetType(fullClassName); 
            if (tp == null) 
                return false; 
            MethodInfo method = tp.GetMethod(methodName); 
            if (method == null) 
                return false; 
            Object obj = Activator.CreateInstance(tp); 
            method.Invoke(obj, args); 
            return true;            
        } 
    } /* 何问起 hovertree.com */
}