将消息从wcf服务推送到Windows Universal App

Question

我在Windows服务上托管了一个wcf服务。 WinForm和aspnet站点从此服务获取信息。我创建了Uwp应用程序并将其连接到同一服务。 Uwp可以向服务发送请求并接收返回数据。问题是服务使用回调将数据推送到客户端。当服务广播到应用程序时，应用程序什么都没有。下次服务尝试广播或客户端尝试发送请求时，通道被破坏。客户端没有异常，只是没有收到响应。服务得到：

Cannot access a disposed object.

对象名称：'System.ServiceModel.Channels.ServiceChannel'。

没有内在的例外。堆栈是：

Server stack trace: 

处于System.ServiceModel.Channels.Cmunnels.CommunicationObject.ThrowIfDisposedOrNotOpen（）处于System.ServiceModel的System.ServiceModel.Channels.ServiceChannel.Call（String action，Boolean oneway，ProxyOperationRuntime operation，Object [] ins，Object [] outs，TimeSpan timeout）。 System.ServiceModel.Channels.ServiceChannelProxy.Invoke（IMessage消息）中的Channels.ServiceChannelProxy.InvokeService（IMethodCallMessage methodCall，ProxyOperationRuntime操作）

在[0]处重新抛出异常：

主机配置：

<system.serviceModel>
<services>
  <!-- This section is optional with the new configuration model  
       introduced in .NET Framework 4. -->

  <service behaviorConfiguration="ServiceBehavior"
  name="TL.TrayNotify.WcfService.WcfService">
    <host>
      <baseAddresses>
        <add baseAddress="net.tcp://server:8089/TeamCity"/>
      </baseAddresses>
    </host>
    <endpoint address="net.tcp://server:8089/TeamCityService/TeamCity/tcp" 
              binding="netTcpBinding" contract="TL.TrayNotify.WcfService.IWcfService" 
              bindingConfiguration="tcpBinding">
      <identity>
        <dns value="localhost"/>
      </identity>
    </endpoint>

    <endpoint address="net.tcp://server:8090/Calculator/mex" binding="mexTcpBinding"
     contract="IMetadataExchange"/>
  </service>
</services>
<behaviors>
  <serviceBehaviors>
    <behavior name="ServiceBehavior">
      <serviceMetadata httpGetEnabled="false"/>
      <serviceDebug includeExceptionDetailInFaults="true "/>
    </behavior>
  </serviceBehaviors>
</behaviors>
<bindings>
  <netTcpBinding>
    <binding name="tcpBinding">
      <security mode="None"></security>
      <reliableSession enabled="false" inactivityTimeout="00:20:00" />
    </binding>
  </netTcpBinding>
</bindings>

Uwp连接：

NetTcpBinding tcpBinding = new NetTcpBinding();
tcpBinding.Security.Mode = SecurityMode.None;
tcpBinding.Security.Transport.ClientCredentialType = TcpClientCredentialType.Windows;
tcpBinding.Security.Message.ClientCredentialType = MessageCredentialType.None;
//new client
m_client = new WcfServiceClient(tcpBinding, new EndpointAddress("net.tcp://server:8089/TeamCityService/TeamCity/tcp"));
m_client.ClientCredentials.Windows.ClientCredential.UserName = "user";
m_client.ClientCredentials.Windows.ClientCredential.Password = "password";
//bind call back event
m_client.BroadcastToClientReceived += MyTeamCityClient_ReceiveTeamCityBroadcastReceived;
await m_client.OpenAsync();
await this.m_client.RegisterClientAsync(m_deviceName);

即使服务向该客户端广播，MyTeamCityClient_ReceiveTeamCityBroadcastReceived也永远不会被调用。

Answer 1

如果这个http://github.com/klimkina/CSharp/tree/master/UwpCalculator重现了这个问题，我有一个修复的应用程序工作：在reference.cs后跟第157行添加ICalculatorCallback的以下声明后，测试应用程序工作没有问题。

[System.ServiceModel.OperationContractAttribute(IsOneWay = true, Action = "http://tempuri.org/ICalculator/BroadcastToClient")]
void BroadcastToClient(string message);

原因：在UWP项目的reference.cs文件中，ICalculatorCallback定义缺少BroadcastToClient(string)方法的声明，尽管BroadcastToClient(string)方法的定义可以在名为ICalculatorCallback的CalculatorClientCallback实现中找到。