backgroundworker_C # backgroundworker_winform进度条控件(5)

{

bws[i].CancelAsync();

}

}

void bw_DoWork(object sender, DoWorkEventArgs e)

{

int j = Convert.ToInt32(e.Argument);

for (int i = j; i < 1000; i = i + t)

{

if (((BackgroundWorker)sender).CancellationPending)

{

e.Cancel = true;

return;

}

string item = String.Format("线程{0}正在操作数据{1}", j + 1, i);

this.Invoke((MethodInvoker)delegate

{

this.richTextBox1.Text += item + Environment.NewLine;

});

Thread.Sleep(200);

}

}

void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

{

bws.Remove(sender as BackgroundWorker);

if (bws.Count == 0)

{

if (e.Cancelled)

{

this.richTextBox1.Text += "线程已经停止";

}

else

{

this.richTextBox1.Text += "线程已经完成";

}

}

}

上面代码中的停止不是能立即停止，这个就和开车一样，开的越快，刹车的后拖行的距离越长，同理，开启的线程的越多，完全暂停需要的时间越长，不知我说的是否正确。另外我也想问一下是否能真正的全部线程停止，点停止后全部线程立即停止。

下面我们继续加入暂停和继续的功能，一样的道理，我们使用List<ManualResetEvent>。

List<BackgroundWorker> bws = new List<BackgroundWorker>();

List<ManualResetEvent> mrs = new List<ManualResetEvent>();

int t = 10;

private void button1_Click(object sender, EventArgs e)

{

for (int i = 0; i < t; i++)

{

BackgroundWorker bw = new BackgroundWorker();

bw.DoWork += new DoWorkEventHandler(bw_DoWork);

bw.WorkerSupportsCancellation = true;

bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);

bws.Add(bw);

bw.RunWorkerAsync(i);

mrs.Add(new ManualResetEvent(true));

}

}

private void button2_Click(object sender, EventArgs e)

{

for (int i = 0; i < t; i++)

{

bws[i].CancelAsync();

}

}

private void button3_Click(object sender, EventArgs e)

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