WCF4.0-Discovery

在以前的WCF中，Client调用一个Service,首先得知道Service的Address.

当客户端不能确定这个Address的时候呢？一个不恰当的比方：当您不知道某人的住所却又想找到他的时候？

WCF4.0发布的Discovery 功能 或许可以满足这个需要.

WCF4.0-Discovery 提供了 Ad-Hoc & Managed 模式。

具体信息：

http://msdn.microsoft.com/en-us/library/dd456791.aspx 

这里仅仅是一个小小的Demo，方便自己查找Code而已^_^.

运行效果：（运行的2个Service端）

2个Console程序.

1. Service端

Program.cs

namespace WCFDiscoveryServer
{
    class Program
    {
        static void Main(string[] args)
        {
            Uri baseAddress = new Uri("http://localhost:8000/" + Guid.NewGuid().ToString());
            using (ServiceHost serviceHost = new ServiceHost(typeof(LoginService), baseAddress))
            {
                serviceHost.AddServiceEndpoint(typeof(ILogin), new WSHttpBinding(), String.Empty);
                // Discoverable @ UDP multicast   
                serviceHost.Description.Behaviors.Add(new ServiceDiscoveryBehavior());
                serviceHost.AddServiceEndpoint(new UdpDiscoveryEndpoint());
                serviceHost.Open();
                Console.WriteLine("Service started at {0}", baseAddress);
                Console.WriteLine();
                Console.WriteLine("Press any key to terminate the service.");
                Console.WriteLine();
                Console.ReadKey();
            }
        }
    }
}

ILogin.cs

namespace WCFDiscoveryServer
{
    [ServiceContract]
    public interface ILogin
    {
        [OperationContract]
        string Echo(string input);
    }
}

LoginService.cs

namespace WCFDiscoveryServer
{
    public class LoginService : ILogin
    {
        public string Echo(string input)
        {
            string result = string.Format("You said:{0} @{1}", input, DateTime.Now);
            Console.WriteLine(result);
            return result;
        }
    }
}

2.Client端

ILogin.cs

namespace WCFDiscoveryClient
{
    [ServiceContract]
    public interface ILogin
    {
        [OperationContract]
        string Echo(string input);
    }
}

Program.cs

namespace WCFDiscoveryClient
{
    class Program
    {
        static void Main(string[] args)
        {
            DiscoveryClient discoveryClient = new DiscoveryClient(new UdpDiscoveryEndpoint());
            Console.WriteLine("Finding ILogin endpoints...");
            Console.WriteLine();
            // Find ILogin service endpoints   
            FindResponse findResponse = discoveryClient.Find(new FindCriteria(typeof(ILogin)));
            Console.WriteLine("Found {0} ILogin endpoint.", findResponse.Endpoints.Count);
            Console.WriteLine();
            EndpointAddress address;
            if (findResponse.Endpoints.Count > 0)
            {
                address = findResponse.Endpoints[0].Address;
                foreach (var item in findResponse.Endpoints) 
                {
                    Console.WriteLine(item.Address.Uri.ToString());
                }
                ILogin loginService = ChannelFactory<ILogin>.CreateChannel(new WSHttpBinding(), findResponse.Endpoints[0].Address);
                Console.WriteLine(loginService.Echo("Test"));
            }
            Console.WriteLine("Press any key to exit.");
            Console.WriteLine();
            Console.ReadKey();
        }
    }
}