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。