Winforms でマルチスレッドを使用するための完全な解決策は、 と を組み合わせることBackgroundWorkerですAutoResetEvent。
私が正しければ、それBackgroundWorkerは のようなもので、バックグラウンド スレッドから UI へのシグナル伝達のためThreadにイベント ハンドラーと適切に連携するという利点があります。UI からバックグラウンド スレッドへのシグナリングProgressChangedが必要な場合があります。AutoResetEvent私の場合、[次へ] ボタンを使用して、データを受信するための新しいブロッキング呼び出しを開始したいと考えています。以下は、私がテストしたコードです。
ただし、問題は、ここで使用するよりも良い方法が本当にないかどうかAutoResetEventです。しかし、うまくいくようです。
/// <summary>
/// The Next button uses this to signal the BackgroundWorker
/// to start the blocking call to Receive data
/// </summary>
private AutoResetEvent _SignalStartReceive = new AutoResetEvent(false);
/// <summary>
/// To implement variable time it takes until Receive returns
/// </summary>
private Random _RandomTime = new Random();
// Class Initializer
public Form()
{
backgroundWorker_Receive.WorkerReportsProgress = true;
backgroundWorker_Receive.RunWorkerAsync();
return;
}
/// <summary>
/// User presses this button when he is ready to Receive the next
/// data packet
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button_ReceiveNext_Click(object sender, EventArgs e)
{
checkBox_Receive.Checked = true;
textBox_ReceivedContent.Text = "";
_SignalStartReceive.Set();
return;
}
/// <summary>
/// User presses this button when he is ready to Receive the next
/// data packet
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button_ReceiveNext_Click(object sender, EventArgs e)
{
checkBox_Receive.Checked = true;
textBox_ReceivedContent.Text = "";
_SignalStartReceive.Set();
return;
}
/// <summary>
/// This is the worker thread, running in the background
/// while the UI stays responsive
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void backgroundWorker_Receive_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
while (true)
{
// blocking: wait for button click
_SignalStartReceive.WaitOne();
// blocking: wait for datagram over network
#if true //temporary code to simulate UdpClient.Receive()
DateTime StartTime = DateTime.Now;
int RandomTimeMs = 2000 + 30 * _RandomTime.Next(100);
Thread.Sleep(RandomTimeMs);
_ReceivedDatagram = string.Format("UDP data ... {0} ms", (DateTime.Now - StartTime).TotalMilliseconds);
#else
something with UdpClient.Receive();
#endif
// succeeded:
worker.ReportProgress(0);//fire the event: Receive_ProgressChanged (argument does not matter)
}
//return; //unreachable, but would fire the Completed event
}
/// <summary>
/// Handler for the ReportProgress() call by the BackgroundWorker Thread
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void backgroundWorker_Receive_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
textBox_ReceivedContent.Text = _ReceivedDatagram;
checkBox_Receive.Checked = false;
return;
}