C# Socket的Send实现完全阻塞

C#中Socket的Send方法即使是在阻塞模式下也会立即返回，查了不少资料，都没什么结果，最后在MSDN找到了答案。

Send的发送默认是不带参数的，其实是写入了本地缓存区，然后基础系统拆分后分批次发送。如果想要实现真正的阻塞，需要使用SocketFlag参数

但SocketFlag参数参考MSDN的例子，现在把代码贴上来，一看便知

// Displays sending with a connected socket 
// using the overload that takes a buffer, message size, and socket flags. public static int SendReceiveTest3(Socket server) 
{ 
byte[] msg = Encoding.UTF8.GetBytes("This is a test"); 
byte[] bytes = new byte[256]; 
try {
 // Blocks until send returns. 
int i = server.Send(msg, msg.Length, SocketFlags.None); Console.WriteLine("Sent {0} bytes.", i); 
// Get reply from the server. 
int byteCount = server.Receive(bytes, server.Available, SocketFlags.None); if (byteCount > 0)
 Console.WriteLine(Encoding.UTF8.GetString(bytes)); 
} 
catch (SocketException e) 
{ 
Console.WriteLine("{0} Error code: {1}.", e.Message, e.ErrorCode); 
return (e.ErrorCode); 
} 
return 0; }