CgwMonitorManage.Tiandy.TiandyVideoMonitor.StopReceiveVideo C# (CSharp) Method

        public SmcErr StopReceiveVideo(string cameraNo)
        {
            NLogEx.LoggerEx logEx = new NLogEx.LoggerEx(log);
            logEx.Trace("Enter: TiandyVideoMonitor.StopReceiveVideo({0}).", cameraNo);
            SmcErr err = new CgwError();

            //需要停止的预览句柄
            int needToStopHandel = CgwConst.START_RECEIVE_VIDEO_DATA_FAILED;
            if (this.handelOperateLock.TryEnterWriteLock(CgwConst.ENTER_LOCK_WAIT_TIME))
            {
                try
                {
                    if (this.cameraVideoHandeDic.ContainsKey(cameraNo))
                    {
                        needToStopHandel = this.cameraVideoHandeDic[cameraNo];
                        this.videoHandleCameraDic.Remove(needToStopHandel);
                        this.cameraVideoHandeDic.Remove(cameraNo);
                    }
                    else
                    {
                        //不存在，表示已经删除，不返回错误
                        //err.SetErrorNo(CgwError.STOP_RECEIVE_VIDEO_FAILED);
                        logEx.Warn("Stop Receive camera video data failed. Don't need to end the preview.Camera No:{0}.", cameraNo);
                    }
                }
                finally
                {
                    this.handelOperateLock.ExitWriteLock();
                }
            }

            //调用sdk的停止方法，放在handelOperateLock外面，防止长时间占用锁
            if (needToStopHandel != CgwConst.START_RECEIVE_VIDEO_DATA_FAILED)
            {
                this.sdkClient.StopReceiveVideo(needToStopHandel);
            }

            logEx.Info("Stop Receive camera video data success.Camera No:{0},Handle:{1}.", cameraNo, needToStopHandel);
            return err;
        }