將消息從WCF服務推送到Windows Universal App

Question

我在Windows服務上托管了WCF服務。 WinForm和aspnet站點從此服務獲取信息。 我創建了Uwp應用程序並將其連接到同一服務。 Uwp可以向服務發送請求並接收回數據。 問題是服務使用回調將數據推送到客戶端時。 當服務廣播到應用程序時，應用程序一無所獲。 下次服務嘗試廣播或客戶端嘗試發送請求時，頻道已斷開。 客戶端沒有例外，只是沒有收到響應。 服務獲得：

Cannot access a disposed object.

對象名稱：“ System.ServiceModel.Channels.ServiceChannel”。

沒有內部異常。 堆棧是：

Server stack trace: 

在System.ServiceModel.Channels.ServiceChannel.Call處System.ServiceModel.Channels.CommunicationObject.ThrowIfDisposedOrNotOpen（）處（字符串操作，布爾型單向，ProxyOperationRuntime操作，Object [] ins，Object [] outs，TimeSpan超時）。 System.ServiceModel.Channels.ServiceChannelProxy.Invoke（IMessage消息）上的Channels.ServiceChannelProxy.InvokeService（IMethodCallMessage methodCall，ProxyOperationRuntime操作）

異常重新拋出為[0]：

主機配置：

<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連接：

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);

即使服務確實廣播到此客戶端，也不會調用MyTeamCityClient_ReceiveTeamCityBroadcastReceived 。

Answer 1

如果此http://github.com/klimkina/CSharp/tree/master/UwpCalculator重現了該問題，則我已解決了該應用程序的問題：在reference.cs中添加ICalculatorCallback的以下聲明后，接着＃157行，測試應用程序正常工作。

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

原因：在UWP項目的reference.cs文件中，盡管在名為CalculatorClientCallback的ICalculatorCallback實現中找到了BroadcastToClient(string)方法的定義，但ICalculatorCallback定義缺少BroadcastToClient(string)方法的聲明。