private void ChatRoomHandler_OnConnected(HttpContext context, System.Net.WebSockets.WebSocket socket)
{
var id = Guid.NewGuid().ToString();
webSocketInstances.Add(id, socket);
Parallel.ForEach(webSocketInstances.Values.Where(x => x != socket), x => {
//未確認訊息情況下直接廣播
x.SendTextAsync("使用者: " + id + " 登入").GetAwaiter().GetResult();
});
socket.SendTextAsync("使用者: " + id + " 歡迎").GetAwaiter().GetResult();
}