在Windows Phone 7上使用WCF的System.UnsupportedException

Question

有没有人能够在Windows Phone Series 7模拟器上使用WCF进行通信？

在过去的两天里我一直在努力,而这正好适合我.我可以在Silverlight 3和Silverlight 4中使用普通的Silverlight控件,但不能使用手机版本.这是我尝试过的两个版本:

版本1 - 使用异步模式

BasicHttpBinding basicHttpBinding = new BasicHttpBinding();
EndpointAddress endpointAddress = new EndpointAddress("http://localhost/wcf/Authentication.svc");
Wcf.IAuthentication auth1 = new ChannelFactory<Wcf.IAuthentication>(basicHttpBinding, endpointAddress).CreateChannel(endpointAddress);

AsyncCallback callback = (result) =>
{

    Action<string> write = (str) =>
    {
        this.Dispatcher.BeginInvoke(delegate
        {
            //Display something
        });
    };

    try
    {
        Wcf.IAuthentication auth = result.AsyncState as Wcf.IAuthentication;
        Wcf.AuthenticationResponse response = auth.EndLogin(result);
        write(response.Success.ToString());
    }
    catch (Exception ex)
    {
        write(ex.Message);
        System.Diagnostics.Debug.WriteLine(ex.Message);
    }
};

auth1.BeginLogin("user0", "test0", callback, auth1);

此版本在此行中打破:

Wcf.IAuthentication auth1 = new ChannelFactory<Wcf.IAuthentication>(basicHttpBinding, endpointAddress).CreateChannel(endpointAddress);

投掷System.NotSupportedException.例外情况不是很具描述性,而且callstack同样不是很有用:

   at System.ServiceModel.DiagnosticUtility.ExceptionUtility.BuildMessage(Exception x)
   at System.ServiceModel.DiagnosticUtility.ExceptionUtility.LogException(Exception x)
   at System.ServiceModel.DiagnosticUtility.ExceptionUtility.ThrowHelperError(Exception e)
   at System.ServiceModel.ChannelFactory`1.CreateChannel(EndpointAddress address)
   at WindowsPhoneApplication2.MainPage.DoLogin()
   ....

版本2 - 阻止WCF调用

这是不使用异步模式的版本.

[System.ServiceModel.ServiceContract]
public interface IAuthentication
{
    [System.ServiceModel.OperationContract]
    AuthenticationResponse Login(string user, string password);
}

public class WcfClientBase<TChannel> : System.ServiceModel.ClientBase<TChannel> where TChannel : class {
        public WcfClientBase(string name, bool streaming)
            : base(GetBinding(streaming), GetEndpoint(name)) {
            ClientCredentials.UserName.UserName = WcfConfig.UserName;
            ClientCredentials.UserName.Password = WcfConfig.Password;
        }
        public WcfClientBase(string name) : this(name, false) {}

        private static System.ServiceModel.Channels.Binding GetBinding(bool streaming) {
            System.ServiceModel.BasicHttpBinding binding = new System.ServiceModel.BasicHttpBinding();
            binding.MaxReceivedMessageSize = 1073741824;
            if(streaming) {
                //binding.TransferMode = System.ServiceModel.TransferMode.Streamed;
            }
            /*if(XXXURLXXX.StartsWith("https")) {
                binding.Security.Mode = BasicHttpSecurityMode.Transport;
                binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None;
            }*/
            return binding;
        }

        private static System.ServiceModel.EndpointAddress GetEndpoint(string name) {
            return new System.ServiceModel.EndpointAddress(WcfConfig.Endpoint + name + ".svc");
        }

        protected override TChannel CreateChannel()
        {
            throw new System.NotImplementedException();
        }
    }


auth.Login("test0", "password0");

此版本在System.ServiceModel.ClientBase<TChannel>构造函数中崩溃.调用堆栈有点不同:

   at System.Reflection.MethodInfo.get_ReturnParameter()
   at System.ServiceModel.Description.ServiceReflector.HasNoDisposableParameters(MethodInfo methodInfo)
   at System.ServiceModel.Description.TypeLoader.CreateOperationDescription(ContractDescription contractDescription, MethodInfo methodInfo, MessageDirection direction, ContractReflectionInfo reflectionInfo, ContractDescription declaringContract)
   at System.ServiceModel.Description.TypeLoader.CreateOperationDescriptions(ContractDescription contractDescription, ContractReflectionInfo reflectionInfo, Type contractToGetMethodsFrom, ContractDescription declaringContract, MessageDirection direction)
   at System.ServiceModel.Description.TypeLoader.CreateContractDescription(ServiceContractAttribute contractAttr, Type contractType, Type serviceType, ContractReflectionInfo& reflectionInfo, Object serviceImplementation)
   at System.ServiceModel.Description.TypeLoader.LoadContractDescriptionHelper(Type contractType, Type serviceType, Object serviceImplementation)
   at System.ServiceModel.Description.TypeLoader.LoadContractDescription(Type contractType)
   at System.ServiceModel.ChannelFactory1.CreateDescription()
   at System.ServiceModel.ChannelFactory.InitializeEndpoint(Binding binding, EndpointAddress address)
   at System.ServiceModel.ChannelFactory1..ctor(Binding binding, EndpointAddress remoteAddress)
   at System.ServiceModel.ClientBase1..ctor(Binding binding, EndpointAddress remoteAddress)
   at Wcf.WcfClientBase1..ctor(String name, Boolean streaming)
   at Wcf.WcfClientBase`1..ctor(String name)
   at Wcf.AuthenticationClient..ctor()
   at WindowsPhoneApplication2.MainPage.DoLogin()
   ...

有任何想法吗？

Answer 1

正如scottmarlowe指出的那样,自动生成的服务引用才起作用.我已经开始着手解决为什么它的血腥地狱和手动版本没有.

我发现了罪魁祸首ChannelFactory.出于某种原因new ChannelFactory<T>().CreateChannel()只是抛出异常.我找到的唯一解决方案是提供您自己的频道实现.这包括:

1. 覆盖ClientBase.(可选的).
2. 覆盖ClientBase.CreateChannel.(可选的).
3. SubBlass ChannelBase,具有WCF接口的特定实现

现在,ClientBase已经通过ChannelFactory属性提供了通道工厂的实例.如果你只是CreateChannel取消,你会得到同样的例外.您需要实例化从内部在步骤3中定义的通道CreateChannel.

这是它们如何组合在一起的基本线框.

[DataContractAttribute]
public partial class AuthenticationResponse {
[DataMemberAttribute]
public bool Success {
    get; set;
}

[System.ServiceModel.ServiceContract]
public interface IAuthentication
{
    [System.ServiceModel.OperationContract(AsyncPattern = true)]
    IAsyncResult BeginLogin(string user, string password, AsyncCallback callback, object state);
    AuthenticationResponse EndLogin(IAsyncResult result);
}

public class AuthenticationClient : ClientBase<IAuthentication>, IAuthentication {

    public AuthenticationClient(System.ServiceModel.Channels.Binding b, EndpointAddress ea):base(b,ea)
    {
    }

    public IAsyncResult BeginLogin(string user, string password, AsyncCallback callback, object asyncState)
    {
        return base.Channel.BeginLogin(user, password, callback, asyncState);
    }

    public AuthenticationResponse EndLogin(IAsyncResult result)
    {
        return Channel.EndLogin(result: result);
    }

    protected override IAuthentication CreateChannel()
    {
        return new AuthenticationChannel(this);
    }

    private class AuthenticationChannel : ChannelBase<IAuthentication>, IAuthentication
    {
        public AuthenticationChannel(System.ServiceModel.ClientBase<IAuthentication> client)
        : base(client)
        {
        }

        public System.IAsyncResult BeginLogin(string user, string password, System.AsyncCallback callback, object asyncState)
        {
            object[] _args = new object[2];
            _args[0] = user;
            _args[1] = password;
            System.IAsyncResult _result = base.BeginInvoke("Login", _args, callback, asyncState);
            return _result;
        }

        public AuthenticationResponse EndLogin(System.IAsyncResult result)
        {
            object[] _args = new object[0];
            AuthenticationResponse _result = ((AuthenticationResponse)(base.EndInvoke("Login", _args, result)));
            return _result;
        }
    }
}

TLDR; 如果你想在WP7上使用你自己的WCF代码,你需要创建自己的通道类而不是依赖它ChannelFactory.