在C#中,可以通過設(shè)置Socket的KeepAlive屬性來避免連接超時。KeepAlive是一個布爾值,表示是否啟用TCP的KeepAlive功能。當(dāng)設(shè)為true時,系統(tǒng)會定期發(fā)送KeepAlive包以確保連接處于活動狀態(tài)??梢酝ㄟ^以下代碼設(shè)置KeepAlive屬性:
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
在設(shè)置KeepAlive屬性之后,可以通過設(shè)置相應(yīng)的KeepAlive參數(shù)來控制KeepAlive包的發(fā)送頻率和超時時間??梢酝ㄟ^以下代碼設(shè)置KeepAlive參數(shù):
// 設(shè)置KeepAlive包的發(fā)送間隔和超時時間
socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.TcpKeepAliveTime, 30000); // 發(fā)送KeepAlive包的間隔時間為30秒
socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.TcpKeepAliveInterval, 5000); // KeepAlive包發(fā)送失敗后的重傳間隔時間為5秒
socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.TcpKeepAliveRetryCount, 3); // 重傳次數(shù)為3次
通過設(shè)置合適的KeepAlive參數(shù),可以確保連接處于活動狀態(tài)并避免連接超時。