C# Socket連接請求超時機制實現(xiàn)代碼分享
.Net的System.Net.Sockets.TcpClient和System.Net.Sockets.Socket都沒有直接為Connect/BeginConnect提供超時控制機制。因此,或者發(fā)生網(wǎng)絡(luò)故障時,客戶端連接請求會等待很長一段時間,直到拋出異常。默認的等待時間長達20~30s。.Net Socket庫的SocketOptionName.SendTimeout提供了控制發(fā)送數(shù)據(jù)的超時時間,但并非本文討論的連接請求的超時時間。
實現(xiàn)
下面是實現(xiàn)的關(guān)鍵代碼:
class TimeOutSocket
{
private static bool IsConnectionSuccessful = false;
private static Exception socketexception;
private static ManualResetEvent TimeoutObject = new ManualResetEvent(false);
public static TcpClient TryConnect(IPEndPoint remoteEndPoint, int timeoutMiliSecond)
{
TimeoutObject.Reset();
socketexception = null;
string serverip = Convert.ToString(remoteEndPoint.Address);
int serverport = remoteEndPoint.Port;
TcpClient tcpclient = new TcpClient();
tcpclient.BeginConnect(serverip, serverport,
new AsyncCallback(CallBackMethod), tcpclient);
if (TimeoutObject.WaitOne(timeoutMiliSecond, false))
{
if (IsConnectionSuccessful)
{
return tcpclient;
}
else
{
throw socketexception;
}
}
else
{
tcpclient.Close();
throw new TimeoutException("TimeOut Exception");
}
}
private static void CallBackMethod(IAsyncResult asyncresult)
{
try
{
IsConnectionSuccessful = false;
TcpClient tcpclient = asyncresult.AsyncState as TcpClient;
if (tcpclient.Client != null)
{
tcpclient.EndConnect(asyncresult);
IsConnectionSuccessful = true;
}
}
catch (Exception ex)
{
IsConnectionSuccessful = false;
socketexception = ex;
}
finally
{
TimeoutObject.Set();
}
}
}
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