利用WCF雙工模式實(shí)現(xiàn)即時(shí)通訊

2019-10-29 21:21:03

字體：大中小

供稿：網(wǎng)友

概述

WCF陸陸續(xù)續(xù)也用過多次，但每次都是淺嘗輒止，以將夠解決問題為王道，這幾天稍閑，特尋了些資料看，昨晚嘗試使用WCF的雙工模式實(shí)現(xiàn)了一個(gè)簡(jiǎn)單的即時(shí)通訊程序，通過服務(wù)端轉(zhuǎn)發(fā)實(shí)現(xiàn)客戶端之間的通訊。這只是個(gè)Demo，沒有考慮異常處理和性能問題。解決方案結(jié)構(gòu)如下：

WCF,雙工模式,即時(shí)通訊

契約

using System;using System.Collections.Generic;using System.Linq;using System.ServiceModel;using System.Text;using System.Threading.Tasks;namespace Service.Interface{ [ServiceContract(CallbackContract = typeof(ICallBack))] public interface INoticeOperator { [OperationContract] void Register(String id); [OperationContract] void UnRegister(String id); [OperationContract] void SendMessage(String from, String to, String message); }}

該接口定義了三個(gè)行為，分別是：

•注冊(cè)
•注銷
•發(fā)消息

其中，在特性[ServiceContract(CallbackContract = typeof(ICallBack))]中指定了用于服務(wù)端回調(diào)客戶方法的契約ICallBack，其定義如下：

 using System;using System.Collections.Generic;using System.Linq;using System.ServiceModel;using System.Text;using System.Threading.Tasks;namespace Service.Interface{ public interface ICallBack { [OperationContract(IsOneWay = true)] void Notice(String message); }}

實(shí)體

本Demo只有一個(gè)實(shí)體，用來(lái)表示已經(jīng)注冊(cè)用戶的Id和對(duì)應(yīng)的回調(diào)契約的具體實(shí)現(xiàn)的實(shí)例：

using Service.Interface;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Models{ public class Client { public String Id { get; set; } public ICallBack CallBack { get; set; } }}

契約的實(shí)現(xiàn)代碼

 using Models;using Service.Interface;using System;using System.Collections.Generic;using System.Linq;using System.ServiceModel;using System.Text;using System.Threading.Tasks;namespace Service{ public class NoticeOperator : INoticeOperator { private static List<Client> clientList = new List<Client>(); public void Register(string id) {  Console.WriteLine("register:" + id);  ICallBack callBack = OperationContext.Current.GetCallbackChannel<ICallBack>();  clientList.Add(new Client() { Id = id, CallBack = callBack }); } public void UnRegister(string id) {  Console.WriteLine("unRegister:" + id);  Client client = clientList.Find(c => c.Id == id);  if (client != null)  {  clientList.Remove(client);  } } public void SendMessage(string from, string to, string message) {  Client client = clientList.Find(c => c.Id == to);  if (client != null)  {  String longMessage = String.Format("message from {0} to {1} at {2} : {3}", from, to, DateTime.Now.ToString("HH:mm:ss"), message);  Console.WriteLine(longMessage);  client.CallBack.Notice(longMessage);  } } }}

Register方法用來(lái)把Client實(shí)體加入到一個(gè)列表中，模擬注冊(cè)行為，Clinet實(shí)體包含了用戶信息和實(shí)現(xiàn)了回調(diào)契約的一個(gè)實(shí)例對(duì)象。

UnRegister方法用來(lái)把一個(gè)Client從列表中移除，模擬注銷行為。

SendMessage方法用來(lái)發(fā)送消息，第一個(gè)參數(shù)是發(fā)送者的Id，第二個(gè)參數(shù)是消息接受者的Id，第三個(gè)參數(shù)是發(fā)送內(nèi)容，該方法先將消息在服務(wù)端打印出來(lái)，然后再回調(diào)消息接收者對(duì)應(yīng)的回調(diào)契約的具體實(shí)現(xiàn)類的實(shí)例對(duì)象的Notice方法以達(dá)到服務(wù)端向客戶端發(fā)送消息的目的。

宿主

using Service;using Service.Interface;using System;using System.Collections.Generic;using System.Linq;using System.ServiceModel;using System.ServiceModel.Description;using System.Text;using System.Threading.Tasks;namespace Hosting{ class Program { static void Main(string[] args) {  using (ServiceHost host = new ServiceHost(typeof(NoticeOperator)))  {  host.AddServiceEndpoint(typeof(INoticeOperator), new NetTcpBinding(), "net.tcp://127.0.0.1:9527/NoticeOperator");  host.Opened += (s, e) => Console.WriteLine("service is running...");  host.Open();  Console.ReadLine();  } } }}

宿主是一個(gè)控制臺(tái)應(yīng)用程序，使用的綁定類型為NetTcpBinding，端口是華安的華府的終生代號(hào)。

客戶端代碼

實(shí)現(xiàn)回調(diào)接口

using Service.Interface;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Test{ class CallBack : ICallBack { public void Notice(string message) {  Console.WriteLine(message); } }}

模擬注冊(cè)，發(fā)消息和注銷

 using Service.Interface;using System;using System.Collections.Generic;using System.Linq;using System.ServiceModel;using System.Text;using System.Threading.Tasks;namespace Test{ class Program { static void Main(string[] args) {  InstanceContext context = new InstanceContext(new CallBack());  using (ChannelFactory<INoticeOperator> factory = new DuplexChannelFactory<INoticeOperator>(context, new NetTcpBinding(), "net.tcp://127.0.0.1:9527/NoticeOperator"))  {  INoticeOperator proxy = factory.CreateChannel();  String selfId = args[0];  String friendId = args[1];  proxy.Register(selfId);  Console.WriteLine("----------Register------------");  while(true)  {   String message = Console.ReadLine();   if (message == "q")   {   proxy.UnRegister(selfId);   break;   }   else   {   proxy.SendMessage(selfId, friendId, message);   }  }  } } }}

在CMD中運(yùn)行test.exe Joey Ross表示Joey注冊(cè)，要給他的朋友Ross發(fā)送消息；再起一個(gè)進(jìn)程test.exe Ross Joey表示Ross注冊(cè)，要給他的朋友Joey發(fā)送消息。進(jìn)程啟動(dòng)后輸入一些字符按回車即發(fā)送至了對(duì)方，輸入q回車注銷并退出程序。如下圖所示：

Ross：

WCF,雙工模式,即時(shí)通訊