技术开发 频道

用 .Net Remoting 技术实现“定向广播”

    相对于 WebService 来说,采用 .Net Remoting 技术的客户端能够订阅服务器端事件,这个功能简直太棒了。

    如果想利用该技术作一个简单而又典型的应用,信息广播程序是一个不错的选择。以下代码是一个简单的广播程序,当然,它实在太简陋了。

    服务端:
class Program { static void Main(string[] args) { BinaryServerFormatterSinkProvider sfsp = new BinaryServerFormatterSinkProvider(); sfsp.TypeFilterLevel = TypeFilterLevel.Full; Hashtable props = new Hashtable(); props["port"] = 8086; TcpChannel channel = new TcpChannel(props, null, sfsp); ChannelServices.RegisterChannel(channel, false); SayHello sayHello = new SayHello(); RemotingServices.Marshal(sayHello, "SayHello"); Console.ReadKey(); sayHello.Say("Mike", "Hello, Mike"); Console.ReadKey(); sayHello.Say("John", "Hello, John"); Console.ReadKey(); } }
    客户端:
class Program { static void Main(string[] args) { BinaryServerFormatterSinkProvider sfsp = new BinaryServerFormatterSinkProvider(); sfsp.TypeFilterLevel = TypeFilterLevel.Full; Hashtable props = new Hashtable(); props["port"] = 0; TcpChannel channel = new TcpChannel(props, null, sfsp); ChannelServices.RegisterChannel(channel, false); SayHello sh = (SayHello)Activator.GetObject(typeof(SayHello), "tcp://localhost:8086/SayHello"); SayEventReappear re = new SayEventReappear(); re.ClientId = "John"; sh.OnSay += new SayHandler(re.Say); re.OnSay += new SayHandler(re_OnSay); Console.ReadKey(); } static void re_OnSay(string text) { Console.WriteLine(text); } }

    远程对象、委托及事件重现器(需同时部署在服务端及客户端):

public class SayHello : MarshalByRefObject { public event SayHandler OnSay; public void Say(string clientId, string text) { if (this.OnSay != null) this.OnSay(text); } } public delegate void SayHandler(string text); public class SayEventReappear : MarshalByRefObject { public event SayHandler OnSay; public void Say(string text) { if (this.OnSay != null) this.OnSay(text); } }

    OK,我的信息广播程序就这样完成了。  

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