如何在 Windows 通用应用中使用双工 wcf 服务 [英] How to consume duplex wcf service in Windows Universal App

问题描述

如何在 Windows 通用应用中使用双工合约使用 wcf 服务?

我收到 PlatformNotSupportedExcetpion:此平台不支持操作. 尝试在 Windows 通用应用程序中使用双工 wcf 服务时出现运行时异常，针对 Windows 10 (10.0; Build 10240)

根据

希望能帮到你，

How can I consume wcf service with duplex contract in Windows universal app?

I'm getting PlatformNotSupportedExcetpion: Operation is not supported on this platform. runtime exception when trying to consume duplex wcf service in Windows Universal App, targeting Windows 10 (10.0; Build 10240)

According msdn it is supported API.

If it is not possible, how should I proceed in my scenario? I have two applications (console and windows universal xaml app) running on the same machine and I need two-way communication.

I have clasic .net 4.6 console app, that create the service host:

var host = new ServiceHost(typeof(MyService), new Uri("net.tcp://localhost:8008/MyService"));

var binding = new NetTcpBinding(); //I've also tried net http binding
binding.Security.Mode = SecurityMode.None;

host.Description.Behaviors.Add(new ServiceMetadataBehavior());
host.AddServiceEndpoint(ServiceMetadataBehavior.MexContractName, 
                        MetadataExchangeBindings.CreateMexTcpBinding(),
                        "mex");  

host.AddServiceEndpoint(typeof(IMyService), binding, "");
host.Open();

service contract:

[ServiceContract(CallbackContract = typeof(IMyServiceCallback))]
public interface IMyService
{
    [OperationContract(IsOneWay = true)]
    void Initialize();
}

public interface IMyServiceCallback
{
    [OperationContract(IsOneWay = true)]
    void OnFrame(int i);
}

I have tried both, ChannelFactory and generated wcf client by Add Service Reference dialog and both NetHttpBinding and NetTcpBinding in the in UWP app.

When I try to create instance of the wcf client, it throws the PlatformNotSupportedExcetpion.

Source: System.Private.ServiceModel

StackTrace:

 at System.ServiceModel.ReflectionExtensions.GetInterfaceMap(Type type, Type interfaceType)
   at System.ServiceModel.Description.TypeLoader.GetIOperationBehaviorAttributesFromType(OperationDescription opDesc, Type targetIface, Type implType)
   at System.ServiceModel.Description.TypeLoader.<>c__DisplayClass8.<AddBehaviorsFromImplementationType>b__10(Type currentType, KeyedByTypeCollection`1 behaviors)
   at System.ServiceModel.Description.TypeLoader.AddBehaviorsAtOneScope[IBehavior,TBehaviorCollection](Type type, TBehaviorCollection descriptionBehaviors, ServiceInheritanceCallback`2 callback)
   at System.ServiceModel.Description.TypeLoader.AddBehaviorsFromImplementationType(ServiceEndpoint serviceEndpoint, Type implementationType)
   at System.ServiceModel.ChannelFactory`1.ReflectOnCallbackInstance(ServiceEndpoint endpoint)
   at System.ServiceModel.ChannelFactory`1.CreateDescription()
   at System.ServiceModel.ChannelFactory.InitializeEndpoint(Binding binding, EndpointAddress address)
   at System.ServiceModel.DuplexChannelFactory`1..ctor(Object callbackObject, Binding binding, EndpointAddress remoteAddress)
   at System.ServiceModel.ClientBase`1..ctor(InstanceContext callbackInstance, Binding binding, EndpointAddress remoteAddress)
   at System.ServiceModel.DuplexClientBase`1..ctor(InstanceContext callbackInstance, Binding binding, EndpointAddress remoteAddress)
   at App1.ServiceReference1.MyServiceClientBase..ctor(InstanceContext callbackInstance)
   at App1.ServiceReference1.MyServiceClient..ctor(MyServiceClientCallback callbackImpl)
   at App1.ServiceReference1.MyServiceClient..ctor()
   at App1.MainPage.<button_Click>d__1.MoveNext()

解决方案

Duplex scenario is not supported even in the 10580 build (latest .NETCore v5.1.0).

There was a bug reported ion GitHub about the wrong usage of reflection in WCF duplex implementation. This bug was fixed in the latest build for .net core and you can include the individual package from Nuget gallery. However, this package require you to also include the prerelease versions of System.Runtime and System.Threading.

Hope it helps,

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