/// <summary>
/// 接收客户端处理线程返回的断开事件并清理客户端连接列表
/// </summary>
/// <param name="client">断开的客户端</param>
/// <param name="reason">断开的原因</param>
private void Client_ClientDisconnected(TCPClientThread client, string reason)
{
log.Info("检测到客户端 " + client.IPAddress + " 已断开连接，正在清理处理线程 断线原因：" + reason);
client.Terminate();
_clients.Remove(client);
}