Remoting in .NET Using C#

Create a Remotable Object

using System; using System.Runtime.Remoting; using System.Runtime.Remoting.Channels; using System.Runtime.Remoting.Channels.Tcp; namespace MyRemoting { /// Sample object to demonstrate the use of .NET Remoting. public class MyObject : MarshalByRefObject { public SampleObject() { } /// Return a hello message public string HelloWorld() { return "Hello World!"; } } }

 

Create a Server To Expose the Remotable Object

using System; using System.Runtime.Remoting; using System.Runtime.Remoting.Channels; using System.Runtime.Remoting.Channels.Tcp; namespace MyRemotingServer { /// Sample server to demonstrate the use of .NET Remoting. public class SampleServer { public static int Main(string [] args) { // Create an instance of a channel TcpChannel channel = new TcpChannel(8080); ChannelServices.RegisterChannel(channel); // Register as an available service with the name HelloWorld RemotingConfiguration.RegisterWellKnownServiceType( typeof(MyObject), "HelloWorld", WellKnownObjectMode.SingleCall); System.Console.WriteLine( "Press the enter key to exit..."); System.Console.ReadLine(); return 0; } } }

 

Create a Client To Use the Remotable Object

using System; using System.Runtime.Remoting; using System.Runtime.Remoting.Channels; using System.Runtime.Remoting.Channels.Tcp; using MyRemoting namespace MyRemotingClient { /// Sample client to demonstrate the use of .NET Remoting. public class SampleClient { public static int Main(string [] args) { // Create a channel for communicating with the remote object // Notice no port is specified on the client TcpChannel chan = new TcpChannel(); ChannelServices.RegisterChannel(chan); // Create an instance of the remote object MyObject obj = (MyObject) Activator.GetObject( typeof(MyRemoting.MyObject), "tcp://localhost:8080/HelloWorld" ); // Use the object if( obj.Equals(null) ) { System.Console.WriteLine( "Error: unable to locate server"); } Else { Console.WriteLine(obj.HelloWorld()); } return 0; } } }

 

摘自http://www.codeproject.com/KB/IP/cs_remoting.aspx

基於接口方式未測試成功，繼續。。。

 

我們在服務器端的遠程對象中加上抽象工廠的接口和實現類：
    public interface IServerObject
    {
        Person GetPersonInfo(string name,string sex,int age);
    }

    public interface IServerObjFactory
    {
        IServerObject CreateInstance();       
    }

    public class ServerObject:MarshalByRefObject,IServerObject
    {
        public Person GetPersonInfo(string name,string sex,int age)
        {
            Person person = new Person();
            person.Name = name;
            person.Sex = sex;
            person.Age = age;
            return person;
        }       
    }

    public class ServerObjFactory:MarshalByRefObject,IServerObjFactory
    {
        public IServerObject CreateInstance()
        {
            return new ServerObject();
        }
    }

然後再客戶端的遠程對象中只提供工廠接口和原來的對象接口：
    public interface IServerObject
    {
        Person GetPersonInfo(string name,string sex,int age);
    }

    public interface IServerObjFactory
    {
        IServerObject CreateInstance();       
    }
我們用WellKnown激活模式註冊遠程對象，在服務器端：
           //傳遞對象；
            RemotingConfiguration.RegisterWellKnownServiceType(
                typeof(ServerRemoteObject.ServerObjFactory),
                "ServiceMessage",WellKnownObjectMode.SingleCall);

注意這裏註冊的不是ServerObject類對象，而是ServerObjFactory類對象。

客戶端：
ServerRemoteObject.IServerObjFactory serverFactory =               
                (ServerRemoteObject.IServerObjFactory) Activator.GetObject(
                typeof(ServerRemoteObject.IServerObjFactory),
                "tcp://localhost:8080/ServiceMessage");

ServerRemoteObject.IServerObject serverObj = serverFactory.CreateInstance();

爲什麼說這是一種客戶端激活模式的模擬呢？從激活的方法來看，我們是使用了SingleCall模式來激活對象，但此時激活的並非我們要傳遞的遠程 對象，而是工廠對象。如果客戶端要創建遠程對象，還應該通過工廠對象的CreateInstance()方法來獲得。而這個方法正是在客戶端調用的。因此 它的實現方式就等同於客戶端激活模式。