c# 后台程序

最新推荐文章于 2021-06-25 21:31:44 发布

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本文深入探讨了C#中的backgroundworker控件，它允许在后台线程中执行独立任务，确保主窗口操作不受影响。通过实例代码展示如何使用backgroundworker进行后台任务的异步执行、进度更新及任务完成后的处理。

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C# 中的backgroundworker，是我个人认为最具有吸引力的windows标准控件之一，他允许程序在后台运行一个独立的线程，而不影响前台主窗口。这种进程控制在操作数据库或通讯时非常实用，因为后台线程在工作时并不影响前台的任何操作。如果不使用backgroundworker而简单的应用单一线程操作，则通讯时很有可能会造成主窗口假死，知道通讯结束后才会恢复。下面简单介绍backgroundworker的用法：

#region ( worker 1 ) private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { e.Result = NormalTest(backgroundWorker1, e); } private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e) { ProgressBar1.Value = e.ProgressPercentage; Label1.Text = ProgressBar1.Value.ToString() + "%"; Label1.BackColor = Color.Orange; Label1.ForeColor = Color.White; } private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { if (position == 0) { Label1.BackColor = Color.Green; Button_Run1.Enabled = true; Button_Pause1.Enabled = false; Button_Resume1.Enabled = false; Button_Stop1.Enabled = false; } } #endregion private void Button_Run1_Click(object sender, EventArgs e) { position = 0; backgroundWorker1.RunWorkerAsync(); Button_Run1.Enabled = false; Button_Pause1.Enabled = true; Button_Resume1.Enabled = false; Button_Stop1.Enabled = true; } private void Button_Pause1_Click(object sender, EventArgs e) { backgroundWorker1.CancelAsync(); Button_Run1.Enabled = false; Button_Pause1.Enabled = true; Button_Resume1.Enabled = true; Button_Stop1.Enabled = true; } private void Button_Resume1_Click(object sender, EventArgs e) { backgroundWorker1.RunWorkerAsync(); Button_Run1.Enabled = false; Button_Pause1.Enabled = true; Button_Resume1.Enabled = false; Button_Stop1.Enabled = true; } private void Button_Stop1_Click(object sender, EventArgs e) { position = 0; backgroundWorker1.CancelAsync(); Button_Run1.Enabled = false; Button_Pause1.Enabled = true; Button_Resume1.Enabled = false; Button_Stop1.Enabled = true; } private int NormalTest(BackgroundWorker work, DoWorkEventArgs e) { #region [ Pause Testing ] if (work.CancellationPending) { return position; } #endregion for (int i = position; i < nop; i++) { #region [ Pause Testing ] if (work.CancellationPending) { return position; } #endregion .. position = i; work.ReportProgress((position + 1) * 100 / nop); } position = 0; return position; }

有一点需要注意，backgroundworker不能直接操作前台windows窗口中的控件，否则会引起线程的不安全。