signalr 配置错误跟踪

<system.diagnostics>

  <trace autoflush="true" indentsize="4">

    <listeners>

      <add name="default_traces" type="System.Diagnostics.TextWriterTraceListener" initializeData="default_traces.txt" />

    </listeners>

  </trace>

  <switches>

    <add name="SignalRSwitch" value="Error" />

  </switches>

  <sources>

    <source name="Application">

      <listeners>

        <add name="traces" />

      </listeners>

    </source>

    <source name="Microsoft.Owin.Host.SystemWeb">

      <listeners>

        <add name="traces" />

      </listeners>

    </source>

    <source name="SignalR.SqlMessageBus">

      <listeners>

        <add name="SignalR-Bus" />

      </listeners>

    </source>

    <source name="SignalR.ServiceBusMessageBus">

      <listeners>

        <add name="SignalR-Bus" />

      </listeners>

    </source>

    <source name="SignalR.RedisMessageBus">

      <listeners>

        <add name="SignalR-Bus" />

      </listeners>

    </source>

    <source name="SignalR.ScaleoutMessageBus">

      <listeners>

        <add name="SignalR-Bus" />

      </listeners>

    </source>

    <source name="SignalR.Connection">

      <listeners>

        <add name="traces" />

      </listeners>

    </source>

    <source name="SignalR.PersistentConnection">

      <listeners>

        <add name="traces" />

      </listeners>

    </source>

    <source name="SignalR.HubDispatcher">

      <listeners>

        <add name="traces" />

      </listeners>

    </source>

    <source name="SignalR.Transports.WebSocketTransport">

      <listeners>

        <add name="traces" />

      </listeners>

    </source>

    <source name="SignalR.Transports.ServerSentEventsTransport">

      <listeners>

        <add name="traces" />

      </listeners>

    </source>

    <source name="SignalR.Transports.ForeverFrameTransport">

      <listeners>

        <add name="traces" />

      </listeners>

    </source>

    <source name="SignalR.Transports.LongPollingTransport">

      <listeners>

        <add name="traces" />

      </listeners>

    </source>

    <source name="SignalR.Transports.TransportHeartBeat">

      <listeners>

        <add name="traces" />

      </listeners>

    </source>

    <source name="SignalR.ReflectedHubDescriptorProvider">

      <listeners>

        <add name="traces" />

      </listeners>

    </source>

  </sources>

  <sharedListeners>

    <add name="traces" type="System.Diagnostics.TextWriterTraceListener" initializeData="server_traces.txt" />

  </sharedListeners>

</system.diagnostics>