Question

我的班级启动新进程（Tshark）并开始捕获，从主要表单我检查类属性以更新我的GUI，有时收到的数据包率我高到我的GUI卡住所以我想要选项每1-2秒检查一次属性。这是我的进度更改功能，他一直在检查我的课程，在这一点上我更新了我的GUi，我怎么能每隔2秒检查一下这些属性？

Tshark tshark = new Tshark();

private void bgWSniffer_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    tshark = e.UserState as Tshark;
    lblNumberOfReceivedPackets.Text = tshark._receivesPackets.ToString("#,##0");
    lblTrafficRate.Text = (tshark._bitsPerSecond * 0.000001).ToString("0.##") + " Mbit/sec" + " (" + tshark._bitsPerSecond.ToString("#,##0") + " Bits/sec" + ")";
    lblPacketsRate.Text = tshark._packetsPerSecond.ToString("#,##0") + " Packets/sec";
    lblStatus.Text = tshark._status;
    lblFileSize.Text = formatBytes(tshark._myFile.Length);
    tshark._myFile.Refresh();            
}

Answer 1

检查自上次检查后是否已过去2秒。在这里，我正在使用班级成员来处理这段时间。

    private DateTime _LastCheck = DateTime.MinValue;

    private private void bgWSniffer_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        if (_LastCheck.AddSeconds(2) <= DateTime.Now)
        {
            _LastCheck = DateTime.Now;
            // do the UI update.
        }
    }

Answer 2

而不是更新BackgroundWorker中的UI，您只需创建一个Timer来完成工作

private void bgWSniffer_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    tshark = e.UserState as Tshark;
}

在ctor中创建计时器：

_timer = new Timer()
_timer.Intrerval = 2000;
_timer.Tick += UpdateUI;
_timer.Start();

如果值已更改，您可以添加一些检查，这样您就不会不必要地更新UI：

private void UpdateUI()
{
   var local = _tshark;
   if(local != null)
   {
    lblNumberOfReceivedPackets.Text = local._receivesPackets.ToString("#,##0");
    lblTrafficRate.Text = (local._bitsPerSecond * 0.000001).ToString("0.##") + " Mbit/sec" + " (" + local._bitsPerSecond.ToString("#,##0") + " Bits/sec" + ")";
    lblPacketsRate.Text = local._packetsPerSecond.ToString("#,##0") + " Packets/sec";
    lblStatus.Text = local._status;
    lblFileSize.Text = formatBytes(local._myFile.Length);
    local._myFile.Refresh();      
   }  
}

每隔几秒对我的类属性进行一次采样

2 个答案: