using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ClassLibrary1{    public class Class1    {        public static void DoStuff(string msg)        {            Console.WriteLine("Class1.DoStuff: " + msg);                    }    }}

上面是调用的DLL源码

调用主程序源码如下：

using System;using System.Collections.Generic;using System.Linq;using System.Reflection;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            AppDomain ad = AppDomain.CreateDomain("Test");            // Loader lives in another AppDomain            Loader loader = (Loader)ad.CreateInstanceAndUnwrap(                typeof(Loader).Assembly.FullName,                typeof(Loader).FullName);            loader.LoadAssembly(@"..\..\..\ClassLibrary1\bin\Debug\ClassLibrary1.dll");            loader.ExecuteStaticMethod(                "ClassLibrary1.Class1",                "DoStuff",                DateTime.Now.ToShortDateString());            AppDomain.Unload(ad);            Console.ReadLine();                    }        class Loader : MarshalByRefObject         {            private Assembly _assembly;            public override object InitializeLifetimeService() {                return null;            }            public void LoadAssembly( string path ) {                _assembly = Assembly.Load( AssemblyName.GetAssemblyName( path ) );            }            public object ExecuteStaticMethod( string typeName, string methodName, params object[] parameters ) {                Type type = _assembly.GetType( typeName );                // TODO: this won't work if there are overloads available                MethodInfo method = type.GetMethod(                    methodName,                    BindingFlags.Static | BindingFlags.Public );                return method.Invoke( null, parameters );            }        }    }}