Accurately determine whether the network is available

The connected attribute of the network socket class often cannot determine the network connection accurately, the following code can solve this problem

<summary>
Whether you have connected
</summary>
Public virtual BOOL Connected
{
Get
{
Try
{
Check the state of the socket to read
if (M_socket. Connected && M_socket. Poll (0, Selectmode.selectread))
{
byte[] Abyte = new Byte[1];
Because the TCP/IP protocol does not accurately determine whether the network is available
Probation one character, peek parameter specifies that read characters are not removed from the buffer
If readable means the connection is available
if (M_socket. Receive (abyte, 0, 1, socketflags.peek)!= 0)
return true;
Close ("Disconnected.");
return false;
}
}
catch (SocketException E)
{
Onexception (e);
}
Return M_socket. Connected;
}
}