客户端WCF DataContract具有来自服务的空/空值

我有一个简单的WCF服务,从服务器返回时间.我已经确认通过与Fiddler进行检查来发送数据.这是我的服务发送的结果对象xml.

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
     <s:Body>
        <GetTimeResponse xmlns="http://tempuri.org/">
            <GetTimeResult xmlns:a="http://schemas.datacontract.org/2004/07/TestService.DataObjects" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
                <a:theTime>2010-03-26T09:14:38.066372-06:00</a:theTime>
            </GetTimeResult>
        </GetTimeResponse>
     </s:Body>
   </s:Envelope>

所以,据我所知,服务器端没有任何错误.它正在接收请求并返回结果.

但是在我的silverlight客户端上,返回对象的所有成员都是null,空白或默认的vaule.您可以看到服务器返回当前日期和时间.但在silverlight中,我的对象的time属性设置为1/1/0001 12:00 AM(默认值).

在DataContracts与服务器和silverlight客户端之间不匹配的Sooo表示.这是服务器的DataContract

[DataContract]
 public class Time
 {
  [DataMember]
  public DateTime theTime { get; set; }
 }

难以置信的简单这是我的silverlight客户端上的datacontract.

[DataContract]
 public class Time
 {
  [DataMember]
  public DateTime theTime { get; set; }
 }

字面上唯一的区别是应用程序中的命名空间.但是,返回的值仍然为null,为空或.NET默认值.

感谢您的帮助！

UPDATE

这是我所有的服务都通过的ClientBase.我读了一个excellent article here来构造它.

public class ClientBase<T> where T :class 
{
    private T Channel { get; set; }

    private Type ContractType { get; set; }

    private ClientBase()
    {
        ContractType = typeof( T );
    }

    public ClientBase(string endPointConfiguration) :this()
    {
        Channel = new ChannelFactory<T>( endPointConfiguration ).CreateChannel();
    }

    public ClientBase( EndpointAddress address,Binding binding ):this()
    {
        Channel = new ChannelFactory<T>( binding,address ).CreateChannel();
    }

    public void Begin(string methodName,object state,params object[] parameterArray)
    {
        Begin( methodName,null,state,parameterArray );
    }

    public void Begin(string methodName,EventHandler<ClientEventArgs> callBack,params object[] parameterArray)
    {
        if(parameterArray != null)
        {
            Array.Resize(ref parameterArray,parameterArray.Length + 2);
        }
        else
        {
            parameterArray = new object[2];
        }

        parameterArray[ parameterArray.Length - 1 ] = new ObjectClientState {CallBack = callBack,MethodName = methodName,UserState = state};
        parameterArray[ parameterArray.Length - 2 ] = new AsyncCallback( OnCallBack );
        ContractType.InvokeMember( "Begin" + methodName,System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.InvokeMethod |
                                   System.Reflection.BindingFlags.Public,Channel,parameterArray );

    }

    private void OnCallBack(IAsyncResult result)
    {
        ObjectClientState state = result.AsyncState as ObjectClientState;
        if(state == null)
            return;
        Object obj = ContractType.InvokeMember( "End" + state.MethodName,System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.InvokeMethod |
                                                System.Reflection.BindingFlags.Public,new object[] {result} );
        if(state.CallBack != null)
        {
            state.CallBack( this,new ClientEventArgs {Object = obj,UserState = state.UserState} );
        }
    }

    public class ClientEventArgs : EventArgs
    {
        public object Object { get; set; }
        public object UserState { get; set; }

        public T LoadResult<T>()
        {
            if( Object is T )
                return ( T ) Object;
            return default( T );
        }
    }

    private class ObjectClientState
    {
        public EventHandler<ClientEventArgs> CallBack { get; set; }
        public string MethodName { get; set; }
        public object UserState { get; set; }
    }
}

这是我的界面

[ServiceContract]      

    public interface ITestService
            {

                [OperationContract( AsyncPattern = true )]
                IAsyncResult BeginGetTime( AsyncCallback callback,object state );

                Time EndGetTime( IAsyncResult result );

            }

现在我有我的服务类,通过我的BaseService类使用这个接口进行调用.

public class TestSiteService : ClientBase<ITestService>
{
    public TestSiteService (string endPointConfiguration):base(endPointConfiguration) { }

    public TestSiteService ( EndpointAddress address,Binding binding ) : base( address,binding ) { }

    public void GetTime( EventHandler<ClientEventArgs> callBack )
    {
        Begin( "GetTime",callBack,null );
    }
}

最后,这里是实际调用所有内容并进行工作的代码.

TestSiteService client = new TestSiteService ( new EndpointAddress( "http://localhost:3483/wcf/Service.svc" ),new BasicHttpBinding() );

client.GetTime( delegate( object res,ClientBase<ITestService>.ClientEventArgs e )
            {

                Dispatcher.BeginInvoke( () => lblDisplay.Text = "Welcome " + e.LoadResult<Time>().theTime );

            } );

我希望没有人丢失所有这些代码我发布：P

解决方法

因为您没有在DataContractAttribute上设置 the Namespace property,所以命名空间将从.NET类/命名空间进行协调.您可以在发布的SOAP消息示例中看到此信息：

http://schemas.datacontract.org/2004/07/TestService.DataObjects

为了使合同被视为相等,您必须将DataContract上的Namespace属性设置为两边的相同值.这可能看起来像这样一些东西：

[DataContract(Namespace="urn:my-test-namespace")]