c# - WCF 一个服务实例的多个 channel

Question

这是我的服务器应用程序代码:

[ServiceContract]
public interface IFirst
{
    [OperationContract]
    void First();
}

[ServiceContract]
public interface ISecond
{
    [OperationContract]
    void Second();
}

[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]
class Service : IFirst, ISecond
{
    static int count = 0;
    int serviceID;

    public Service()
    {
        serviceID = ++count;

        Console.WriteLine("Service {0} created.", serviceID);
    }

    public void First()
    {
        Console.WriteLine("First function. ServiceID: {0}", serviceID);
    }

    public void Second()
    {
        Console.WriteLine("Second function. ServiceID: {0}", serviceID);
    }
}

class Server
{
    static void Main(string[] args)
    {
        ServiceHost host = new ServiceHost(typeof(Service), new Uri("net.tcp://localhost:8000"));
        NetTcpBinding binding = new NetTcpBinding();
        host.AddServiceEndpoint(typeof(IFirst), binding, "");
        host.AddServiceEndpoint(typeof(ISecond), binding, "");
        host.Open();

        Console.WriteLine("Successfully opened port 8000.");
        Console.ReadLine();          
        host.Close();
    }
}

和客户:

class Client
{
    static void Main(string[] args)
    {
        ChannelFactory<IFirst> firstFactory = new ChannelFactory<IFirst>(new NetTcpBinding(), new EndpointAddress("net.tcp://localhost:8000"));
        IFirst iForst = firstFactory.CreateChannel();
        iForst.First();

        ChannelFactory<ISecond> secondFactory = new ChannelFactory<ISecond>(new NetTcpBinding(), new EndpointAddress("net.tcp://localhost:8000"));
        ISecond iSecond = secondFactory.CreateChannel();
        iSecond.Second();

        Console.ReadLine();

    }
}

当我运行它时，我得到输出:

Successfully opened port 8000.
Service 1 created.
First function. ServiceID: 1
Service 2 created.
Second function. ServiceID: 2

在我的例子中，服务器创建了两个服务实例。我想要做的是为与 First 相同的服务实例调用 Second 函数。

Answer 1

你可以做两件事:

将 Second 移动到 IFirst 这样

public interface IFirst
{
    [OperationContract]
    void First();

    [OperationContract]
    void Second();
}

或者对服务实例使用单例

[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)] 
class Service : IFirst, ISecond
{
...
}