如果您使用的是.Net Framework 4.x并使用app.config（如果您托管的是站点，则使用web.config），则可以配置名为“System.Net.WebSockets”的TraceSource，添加适当的开关级别和侦听器。

<configuration>
  <system.diagnostics>
    <sources>
      <source name="System.Net.WebSockets">
        <listeners>
          <add name="System.Net"/>
        </listeners>
      </source>
   </sources>
    <switches>
      <add name="System.Net.WebSockets" value="Verbose"/>
    </switches>
    <sharedListeners>
      <add name="System.Net"
        type="System.Diagnostics.TextWriterTraceListener"
        initializeData="network.log"
        traceOutputOptions="ProcessId, DateTime"
      />
    </sharedListeners>
    <trace autoflush="true"/>
  </system.diagnostics>
</configuration>

这是使用Verbose开关（我在这里连接到ws://qa.sockets.stackexchange.com/）时可以预期的输出类型

System.Net.WebSockets Verbose: 0 : [9428] Entering ClientWebSocket#45004109::.ctor()
System.Net.WebSockets Verbose: 0 : [9428] Exiting ClientWebSocket#45004109::.ctor() 
System.Net.WebSockets Information: 0 : [9428] Associating ClientWebSocket#45004109 with HttpWebRequest#21454193
System.Net.WebSockets Information: 0 : [14188] Associating ClientWebSocket#45004109 with HttpWebResponse#12547953
System.Net.WebSockets Verbose: 0 : [14188] Entering InternalClientWebSocket#31364015::Initialize(ReceiveBufferSize: 16384, SendBufferSize: 16384,  Protocols: , KeepAliveInterval: 00:00:30, innerStream: WebSocketConnectionStream#11429296, internalBuffer: WebSocketBuffer#41622463)
System.Net.WebSockets Information: 0 : [14188] Associating InternalClientWebSocket#31364015 with WebSocketConnectionStream#11429296
System.Net.WebSockets Information: 0 : [14188] Associating InternalClientWebSocket#31364015 with WebSocketBuffer#41622463
System.Net.WebSockets Information: 0 : [14188] Associating WebSocketConnectionStream#11429296 with WebSocketConnection#28379535
System.Net.WebSockets Verbose: 0 : [14188] Exiting InternalClientWebSocket#31364015::Initialize()   -> ReceiveBufferSize: 16384, SendBufferSize: 16384,  Protocols: , KeepAliveInterval: 00:00:30, innerStream: WebSocketConnectionStream#11429296, internalBuffer: WebSocketBuffer#41622463
System.Net.WebSockets Information: 0 : [14188] Associating ClientWebSocket#45004109 with InternalClientWebSocket#31364015
System.Net.WebSockets Verbose: 0 : [14188] Entering InternalClientWebSocket#31364015::SendAsync(messageType: Text, endOfMessage: True)
System.Net.WebSockets Verbose: 0 : [14188] Data from InternalClientWebSocket#31364015::SendAsync
System.Net.WebSockets Verbose: 0 : [14188] 00000000 : 31 35 35 2D 71 75 65 73-74 69 6F 6E 73 2D 61 63 : 155-questions-ac
System.Net.WebSockets Verbose: 0 : [14188] 00000010 : 74 69 76 65                                     : tive
System.Net.WebSockets Verbose: 0 : [14188] Entering WebSocketConnectionStream#11429296::WriteAsync(offset: 16384, count: 26, cancellationToken.CanBeCanceled: True)
System.Net.WebSockets Verbose: 0 : [14188] Entering WebSocketConnection#28379535::WriteAsync(offset: 16384, count: 26, cancellationToken.CanBeCanceled: True)
System.Net.WebSockets Verbose: 0 : [14188] Exiting WebSocketConnection#28379535::WriteAsync()   -> Boolean#1
System.Net.WebSockets Verbose: 0 : [3848] Entering WebSocketConnection#28379535::OnWriteCompleted(LastOperation: Send, SocketError: Success)
System.Net.WebSockets Verbose: 0 : [3848] Data from WebSocketConnectionStream#11429296::WriteAsync
System.Net.WebSockets Verbose: 0 : [3848] 00004000 : 81 94 2C 5F 76 52 1D 6A-43 7F 5D 2A 13 21 58 36 : ..,_vR.jC.]*.!X6
System.Net.WebSockets Verbose: 0 : [3848] 00004010 : 19 3C 5F 72 17 31 58 36-00 37                   : .<_r.1X6.7
System.Net.WebSockets Verbose: 0 : [3848] Exiting WebSocketConnectionStream#11429296::WriteAsync() 
System.Net.WebSockets Verbose: 0 : [3848] Exiting InternalClientWebSocket#31364015::SendAsync()     -> messageType: Text, endOfMessage: True
System.Net.WebSockets Verbose: 0 : [3848] Entering InternalClientWebSocket#31364015::ReceiveAsync()
System.Net.WebSockets Verbose: 0 : [3848] Entering WebSocketConnectionStream#11429296::ReadAsync(offset: 0, count: 16384, cancellationToken.CanBeCanceled: True)
System.Net.WebSockets Verbose: 0 : [3848] Entering WebSocketConnection#28379535::ReadAsyncCore(offset: 0, count: 16384, cancellationToken.CanBeCanceled: True)
System.Net.WebSockets Verbose: 0 : [3848] Exiting WebSocketConnection#28379535::ReadAsyncCore()     -> Boolean#1
System.Net.WebSockets Verbose: 0 : [3848] Exiting WebSocketConnection#28379535::OnWriteCompleted() 
System.Net.WebSockets Verbose: 0 : [3848] Entering WebSocketConnection#28379535::OnReadCompleted(LastOperation: Receive, SocketError: Success)
System.Net.WebSockets Verbose: 0 : [3848] Data from WebSocketConnectionStream#11429296::ReadAsync
System.Net.WebSockets Verbose: 0 : [3848] 00000000 : 81 7E 03 11 7B 22 61 63-74 69 6F 6E 22 3A 22 31 : .~..{"action":"1
System.Net.WebSockets Verbose: 0 : [3848] 00000010 : 35 35 2D 71 75 65 73 74-69 6F 6E 73 2D 61 63 74 : 55-questions-act
System.Net.WebSockets Verbose: 0 : [3848] 00000020 : 69 76 65 22 2C 22 64 61-74 61 22 3A 22 7B 5C 22 : ive","data":"{\"
System.Net.WebSockets Verbose: 0 : [3848] 00000030 : 73 69 74 65 42 61 73 65-48 6F 73 74 41 64 64 72 : siteBaseHostAddr
System.Net.WebSockets Verbose: 0 : [3848] 00000040 : 65 73 73 5C 22 3A 5C 22-73 74 61 63 6B 6F 76 65 : ess\":\"stackove
System.Net.WebSockets Verbose: 0 : [3848] 00000050 : 72 66 6C 6F 77 2E 63 6F-6D 5C 22 2C 5C 22 69 64 : rflow.com\",\"id