如下，是不是又会从receivecallback重新开始？

Question

private void recievecallback(IAsyncResult AR) //回发数据个客户端 
{ 
try 
{ 
Socket Rsocket = (Socket)AR.AsyncState; 
int Rend = Rsocket.EndReceive(AR); 
for (int i = 0; i < clientnum; i++) 
{ 
if (clientsocket[i].Connected) 
{ 
clientsocket[i].Send(msgbuffer, 0, Rend, 0); 
} 
Rsocket.BeginReceive(msgbuffer, 0, msgbuffer.Length, 0, new AsyncCallback(recievecallback), Rsocket); 
} 
} 
catch 
{ } 
} 

private void receivecallback(IAsyncResult AR) 
{ 
try 
{ 
int Rend = clientsocket.EndReceive(AR); 
listBox1.Items.Add(Encoding.Unicode.GetString(msgbuffer, 0, Rend)); 
clientsocket.BeginReceive(msgbuffer, 0, msgbuffer.Length, 0, new AsyncCallback(receivecallback), null); 
} 
catch 
{ 
MessageBox.Show("已经与服务器断开!"); 
} 
} 
clientsocket.BeginReceive(msgbuffer, 0, msgbuffer.Length, 0, new AsyncCallback(receivecallback), null); 为什么又new AsyncCallback(receivecallback),这儿，然后是不是又从receivecallback重新开始？

Answer 1

因为这里必须是一个 AsyncCallback 委托，这个是BeginReceive的构造参数。public IAsyncResult BeginReceive (byte[] buffer,int offset,int size,SocketFlags socketFlags,AsyncCallback callback,Object state)参数：bufferByte 类型的数组，它是存储接收到的数据的位置。&nbsp;offsetbuffer 参数中存储所接收数据的位置，该位置从零开始计数。&nbsp;size要接收的字节数。&nbsp;socketFlagsSocketFlags 值的按位组合。&nbsp;callback一个 AsyncCallback 委托，它引用操作完成时要调用的方法。&nbsp;state一个用户定义对象，其中包含接收操作的相关信息。当操作完成时，此对象会被传递给 EndReceive 委托。也就是new AsyncCallback（receivecallback）后又会执行receivecallback（）这个方法。