WCF 服务器/客户端客户端计数

Question

我在 WCF 中制作了服务器/客户端应用程序。如何获取已连接客户端的数量？我怎样才能向每个客户发送订单工作？例如：服务器向每个客户端发送其他号码以进行添加。

Client1 - 1+2=3
Client2 - 1+3=4
Client3 - 1+4=5

并将结果发送到服务器，服务器添加来自客户端的每个结果，我返回值（12）。

我的简单应用：

/////已编辑/////

服务器：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using Interface;

namespace WCFapp
{
    class Program
    {
        static void Main(string[] args)
        {
            Klienci cust = new Klienci();
            cust.Connect();
        }
    }
}

。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Interface;

namespace WCFapp
{
     [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
class Klienci : IMessage
{
    private static List<ImessageCallback> subscribers =
        new List<ImessageCallback>();

    public void lista()
    {
        string nm = Console.ReadLine();
        if (nm == "1")
        {
            Console.WriteLine("Number of conected clients: " + subscribers.Count());
            funkcja();

        }
    }

    public void Connect()
    {
        using (ServiceHost host = new ServiceHost(
            typeof(Klienci), new Uri("net.tcp://localhost:8000")))
        {
            host.AddServiceEndpoint(typeof(IMessage),
                new NetTcpBinding(), "ISubscribe");

            try
            {
                host.Open();
                lista();
                Console.ReadLine();
                host.Close();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
    }

    public bool Subscribe()
    {
        try
        {
            ImessageCallback callback = OperationContext.Current.GetCallbackChannel<ImessageCallback>();
            if (!subscribers.Contains(callback))
                subscribers.Add(callback);
            Console.WriteLine("Client is conected ({0}).", callback.GetHashCode());
            return true;
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
            return false;
        }
    }

    public bool Unsubscribe()
    {
        try
        {
            ImessageCallback callback = OperationContext.Current.GetCallbackChannel<ImessageCallback>();
            if (subscribers.Contains(callback))
                subscribers.Remove(callback);
            Console.WriteLine("Client is unconected ({0}).", callback.GetHashCode());
            return true;
        }
        catch
        {
            return false;
        }
    }

    public void funkcja()
    {
        int a = 1; int b = 3;
        subscribers.ForEach(delegate(ImessageCallback callback)
        {
            if (((ICommunicationObject)callback).State == CommunicationState.Opened)
            {
            Console.WriteLine("a= {0} , b= {1}", a, b);
            callback.klient_licz(a, b);
            a++;
            b++;
            }
        });

    }

    public void polacz(int S)
    {

        Console.WriteLine("Sum: {0}", S);
    }
  }
}

界面：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;


namespace Interface
{
     [ServiceContract(CallbackContract = typeof(ImessageCallback), SessionMode = SessionMode.Required)]
public interface IMessage
{
    [OperationContract]
    void funkcja();

    [OperationContract]
    void polacz(int S);

    [OperationContract]
    bool Subscribe();

    [OperationContract]
    bool Unsubscribe();

}
[ServiceContract]
public interface ImessageCallback
{
    [OperationContract]
    void klient_licz(int a, int b);
}

}

客户：

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using Interface;

namespace Client
{
    class Program
    {
        static void Main(string[] args)
        {
            clients cl = new clients();
            if (cl.Conect() == true)
            {
                string tmp = Console.ReadLine();
                while (tmp != "EXIT")
                {
                    cl.SendMessage(tmp);
                    tmp = Console.ReadLine();
                }

            }
             cl.Close();
             Environment.Exit(0);
       }
   }
}

。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using Interface;

namespace Client
{
    class clients : ImessageCallback, IDisposable
    {
        IMessage pipeProxy = null;
        public bool Conect()
        {
            DuplexChannelFactory<IMessage> pipeFactory =
                new DuplexChannelFactory<IMessage>(
                    new InstanceContext(this),
                    new NetTcpBinding(),
                    new EndpointAddress("net.tcp://localhost:8000/ISubscribe"));
            try
            {
                pipeProxy = pipeFactory.CreateChannel();
                pipeProxy.Subscribe();
               return true;
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                return false;
            }

        }

        public void Close()
        {
            pipeProxy.Unsubscribe();
        }


        public void klient_licz(int a, int b)
        {
            int S = a + b;
            Console.WriteLine("Sum= {0}", S);
            pipeProxy.polacz(S); //ERROR
        }

    }
}

我编辑了代码。现在我在 pipelineproxy.polacz(S); 中遇到异常 功能 ;/

This operation would deadlock because the reply cannot be received until the current Message completes processing. If you want to allow out-of-order message processing, specify ConcurrencyMode of Reentrant or Multiple on CallbackBehaviorAttribute.

Answer 1

服务器负责缓存客户端列表。通常，这将是客户端回调接口的列表：

List<IClientCallback> clients; 

通常，您可以从传入的客户端调用中填充此内容（通常在特定的服务器方法中，例如“RegisterClient” - 但可以是服务器上的任何传入调用）：

IClientCallback callback = OperationContext.Current.GetCallbackChannel<IClientCallback>();              
if (!clients.Contains(callback))
    clients.Add(callback);

要管理对客户端的广播，您需要一个通用方法来回调客户端列表中所有客户端上的特定方法：

void CallbackAllClients(Action<IClientCallback> action) {
    for (int i=clients.Count-1; i >= 0; i--) {
        IClientCallback callback = clients[i];
        if (((ICommunicationObject)callback).State == CommunicationState.Opened) {
            try {
                action(callback);
            }
            catch (Exception e) {
                clients.RemoveAt(i);
            }
        }
        else
            clients.RemovaAt(i);
    }
}

您可以从服务器代码中调用它，以向所有客户端广播客户端回调，如下所示：

void SomeServerSideEventHandler(MyObject my_obj) {
    CallbackAllClients(client => client.MyObjectChanged(my_obj));
} 

哪里MyObjectChanged有客户端回调接口的方法IClientCallback。这应该可以帮助你完成大部分工作。