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45 Posts :: 0 Stories :: 102 Comments :: 2 Trackbacks

使用BackgroundWorker控件进行异步处理

BackgroundWorker是vs2005自带的，以下代码实现异步修改TextBox的Text

private void button2_Click(object sender, EventArgs e)
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{
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this.textBox1.Text = "start";
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this.backgroundWorker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);
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this.backgroundWorker1.RunWorkerAsync();
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}
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private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
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{
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for (int i = 0; i < 3; i++)
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{
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for (int j = 0; j < 100000000; j++)
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{
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j++;
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j--;
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}
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this.textBox1.Text = i.ToString();
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}
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}
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private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
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{
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this.textBox1.Text = "complete";
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}

posted on 2008-02-14 11:39 !LEO 阅读(248) 评论(2) 编辑收藏网摘

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#1楼 2008-02-14 12:59 无常

纠正一点，
DoWork()是在非UI线程中执行的，不能修改UI控件属性，
this.textBox1.Text = i.ToString();
这一句是不合法的。

如果要显示进度，则可在
ProgressChanged()事件中写代码，
别忘了设置　backgroundWorker1.WorkerReportsProgress = true;
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