MSDN文档似乎表明NetworkStream.Read将总是立即返回。如果没有找到数据,则返回0。但是,我有一些代码当前正在运行,只有在某些情况下(我还没有弄清楚哪些情况),NetworkStream.Read似乎会挂起。以下是我从转储文件中收集到的堆栈跟踪:
00000000705ae850 000007fef784f60d DomainBoundILStubClass.IL_STUB(IntPtr, Byte*, Int32, System.Net.Sockets.SocketFlags) 00000000705ae930 000007fef785c930 System.Net.Sockets.Socket.Receive(Byte[], Int32, Int32, System.Net.Sockets.SocketFlags, System.Net.Sockets.SocketError ByRef) 00000000705ae9b0 000007ff004eb668 System.Net.Sockets.NetworkStream.Read(Byte[], Int32, Int32) 00000000705aea40 000007fef784e6ae MySocketStuff.SocketConnectCallback(System.IAsyncResult) 00000000705aeb20 000007fef84f2bbb System.Net.LazyAsyncResult.Complete(IntPtr) 00000000705aeb90 000007fef7853c7b System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object) 00000000705aebe0 000007fef784e5d3 System.Net.ContextAwareResult.Complete(IntPtr) 00000000705aec40 000007fef7d027f9 System.Net.LazyAsyncResult.ProtectedInvokeCallback(System.Object, IntPtr) 00000000705aeca0 000007fef8b9815e System.Net.Sockets.Socket.ConnectCallback() 00000000705aed20 000007fef93e14c2 System.Threading._ThreadPoolWaitOrTimerCallback.PerformWaitOrTimerCallback(System.Object, Boolean)
我注意到NetworkStrea.Read实际上调用了Socket.Receive,根据我的理解,这可能会阻塞。只是我不知道为什么有时它会阻塞,有时它则不会。