手写WCF异步调用的客户端

       今天想试一下WCF的异步调用的功能，就在一个自己原有的程序上使用。一般情况我都是自己手写代码的，但是这次我看了 张逸的《WCF服务编程》后按照书上的例子编写后发现会抛出一个异常，迫不得已，我只能用svcutil先来生成一个异步的客户端，然后比较代码之前的不同，终于发现问题的所在，现在把代码贴上：
Contracts：

namespace Contracts
{
    [ServiceContract]
    public interface IAdd
    {
        [OperationContract]
        int Add(int x, int y);
    }
}

Services：

namespace Services
{
    public class AddService :IAdd
    {
        public int Add(int x, int y)
        {
           return x + y;
        }
    }
}

hosting：

namespace Hosting
{
    public class CustomValidate : UserNamePasswordValidator
    {
        public override void Validate(string userName, string password)
        {
            Console.WriteLine(userName + " " + password);
            if (userName != "user" || password != "pwd")
            {
                Console.WriteLine("error");
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            using (ServiceHost host = new ServiceHost(typeof(Services.AddService)))
            {
                host.Opened += delegate
                {
                    Console.WriteLine("opened");
                   
                };
                host.Open();
                Console.Read();
            }
        }
    }
}

Client：

namespace Client
{
    [ServiceContract(ConfigurationName = "Contracts.IAdd")]//问题的坐在，一定不能少
    public interface IAdd
    {
        [OperationContract]
        int Add(int x, int y);
        
        [OperationContract(AsyncPattern = true)]
        IAsyncResult BeginAdd(int x, int y, AsyncCallback callback, object asyncState);
        int EndAdd(IAsyncResult result);
    }
    public class AddClient : ClientBase<IAdd>, IAdd
    {
        public AddClient() : base() { }
        public int Add(int x, int y)
        {
            return base.Channel.Add(x, y);
        }
        public IAsyncResult BeginAdd(int x, int y, AsyncCallback callback, object asyncState)
        {
            return Channel.BeginAdd(x, y, callback, asyncState);
        }
        public int EndAdd(IAsyncResult result)
        {
            return Channel.EndAdd(result);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            AddClient proxy = new AddClient();
            proxy.ClientCredentials.UserName.UserName = "user";
            proxy.ClientCredentials.UserName.Password = "pwd";
            IAsyncResult asyncResult1 = proxy.BeginAdd(2, 3, null, null);
           
            int sum = 0;
            sum = proxy.EndAdd(asyncResult1);
            Console.WriteLine(sum);
            proxy.Close();

            Console.Read();
        }
    }
}

Hosting的app.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior name="behavior">
          <serviceMetadata httpGetEnabled="true" httpGetUrl="http://10.6.235.138:6667/addservice"/>
          <serviceDebug includeExceptionDetailInFaults="true"/>
          <serviceCredentials>
            <clientCertificate>
              <authentication certificateValidationMode="None"/>
            </clientCertificate>
            <serviceCertificate findValue="MyServer" storeLocation="CurrentUser" x509FindType="FindBySubjectName"/>
            <userNameAuthentication userNamePasswordValidationMode="Custom" customUserNamePasswordValidatorType="Hosting.CustomValidate,Hosting"/>
          </serviceCredentials>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <bindings>
      <netTcpBinding>
        <binding name="binding">
          <security mode="Message">
            <message clientCredentialType="UserName"/>
          </security>
        </binding>
      </netTcpBinding>
    </bindings>
    <services>
      <service name="Services.AddService" behaviorConfiguration="behavior">
        <endpoint bindingConfiguration="binding" address="net.tcp://10.6.235.138:6666/addservice" binding="netTcpBinding" contract="Contracts.IAdd"></endpoint>
      </service>
    </services>
  </system.serviceModel>
</configuration>

client的app.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.serviceModel>
    <bindings>
      <netTcpBinding>
        <binding name="binding2">
          <security mode="Message">
            <message clientCredentialType="UserName"/>
          </security>
        </binding>
      </netTcpBinding>
    </bindings>
    <client>
      <endpoint name="point" behaviorConfiguration="behavior3" bindingConfiguration="binding2"  address="net.tcp://10.6.235.138:6666/addservice" binding="netTcpBinding" contract="Contracts.IAdd">
       <identity>
          <dns value="MyServer"/>
          <!-- <certificate encodedValue="c2bb5a41d06ccc2b99bfb771d516728c0af33e78"/>-->
        </identity>
      </endpoint>
    </client>
    
    <behaviors>
      <endpointBehaviors>
        <behavior name="behavior3">
          <clientCredentials>
            <serviceCertificate>
              <authentication certificateValidationMode="None"/>
            </serviceCertificate>
          </clientCredentials>
        </behavior>
      </endpointBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

因为是在原有的代码上做的，所以中间涉及到一些安全的部分，该部分请参考Q.yuhen的文章。