使用GAC和bin加载WEB应用程序域，被加载的对象必须继承MarshalByRefObject

代码如下：

public class Intelligencer : MarshalByRefObject    {        public string Report()        {            AppDomain appDomain = AppDomain.CurrentDomain;            StringBuilder sb = new StringBuilder();            sb.AppendFormat("Domain ID:{0}\r\n",appDomain.Id);            sb.AppendFormat("VirtualPath:{0}\r\n",HostingEnvironment.ApplicationVirtualPath);            sb.AppendFormat("PhysicalOath:{0}\r\n", HostingEnvironment.ApplicationPhysicalPath);            return sb.ToString();        }            }

static void TestHosting()             {                Intelligencer intell = ApplicationHost.CreateApplicationHost(typeof(Intelligencer), "/", Environment.CurrentDirectory) as Intelligencer;                 Console.WriteLine("Current Domain ID:{0}\r\n",AppDomain.CurrentDomain.Id);                 Console.WriteLine(intell.Report());             }

如果调用的对象继承MarshalByRefObject同时也实现IRegisteredObject  我们可以用ApplicationManager来加载应用程序域

public class Intelligencer : MarshalByRefObject, IRegisteredObject    {        public string Report()        {            AppDomain appDomain = AppDomain.CurrentDomain;            StringBuilder sb = new StringBuilder();            sb.AppendFormat("Domain ID:{0}\r\n",appDomain.Id);            sb.AppendFormat("VirtualPath:{0}\r\n",HostingEnvironment.ApplicationVirtualPath);            sb.AppendFormat("PhysicalOath:{0}\r\n", HostingEnvironment.ApplicationPhysicalPath);            return sb.ToString();        }        public void Stop(bool immediate)        {            HostingEnvironment.UnregisterObject(this);        }    }

调用方式

static void TestHosting()        {            Intelligencer intell = CreateWorkerAppDomainWithHost(typeof(Intelligencer), "/", Environment.CurrentDirectory) as Intelligencer;            Console.WriteLine("Current Domain ID:{0}\r\n",AppDomain.CurrentDomain.Id);            Console.WriteLine(intell.Report());        }        static object CreateWorkerAppDomainWithHost(Type hostType,string virtualPath, string physicalPath)        {           string uniqueAppString = string.Concat(virtualPath, physicalPath).ToLowerInvariant();            string appid = (uniqueAppString.GetHashCode()).ToString("X", CultureInfo.InvariantCulture);            var appmanager=ApplicationManager.GetApplicationManager();            var buildManagerHostType = typeof(HttpRuntime).Assembly.GetType("System.Web.Compilation.BuildManagerHost");            var buildManagerHost = appmanager.CreateObject(appid, buildManagerHostType, virtualPath, physicalPath, false);             buildManagerHostType.InvokeMember("RegisterAssembly", BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.NonPublic, null, buildManagerHost, new object[] {hostType.Assembly.FullName,hostType.Assembly.Location });            return appmanager.CreateObject(appid,hostType,virtualPath,physicalPath,false);        }