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我是C#中的新成员。我发现了一些在进度条上工作的代码。什么是当有人点击按钮开始btnStartAsyncOperation_Click
进度条开始增加,当按下btnCancel_Click
它取消操作。这里是代码恢复线程并在另一个按钮上工作
namespace BackgroundWorkerSample
{
public partial class Form1 : Form
{
BackgroundWorker m_oWorker;
public Form1()
{
InitializeComponent();
m_oWorker = new BackgroundWorker();
m_oWorker.DoWork += new DoWorkEventHandler(m_oWorker_DoWork);
m_oWorker.ProgressChanged += new ProgressChangedEventHandler(m_oWorker_ProgressChanged);
m_oWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(abcd);
m_oWorker.WorkerReportsProgress = true;
m_oWorker.WorkerSupportsCancellation = true;
}
void abcd(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Cancelled)
{
lblStatus.Text = "Task Cancelled.";
}
else if (e.Error != null)
{
lblStatus.Text = "Error while performing background operation.";
}
else
{
lblStatus.Text = "Task Completed...";
}
btnStartAsyncOperation.Enabled = true;
btnCancel.Enabled = false;
}
void m_oWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
progressBar1.Value = e.ProgressPercentage;
lblStatus.Text = "Processing......" + progressBar1.Value.ToString() + "%";
}
void m_oWorker_DoWork(object sender, DoWorkEventArgs e)
{
for (int i = 0; i < 100; i++)
{
Thread.Sleep(100);
m_oWorker.ReportProgress(i);
if (m_oWorker.CancellationPending)
{
e.Cancel = true;
m_oWorker.ReportProgress(0);
return;
}
}
//Report 100% completion on operation completed
m_oWorker.ReportProgress(100);
}
private void btnStartAsyncOperation_Click(object sender, EventArgs e)
{
btnStartAsyncOperation.Enabled = false;
btnCancel.Enabled = true;
//Start the async operation here
m_oWorker.RunWorkerAsync();
}
private void btnCancel_Click(object sender, EventArgs e)
{
if (m_oWorker.IsBusy)
{
//Stop/Cancel the async operation here
m_oWorker.CancelAsync();
}
}
private void progressBar1_Click(object sender, EventArgs e)
{
}
private void lblStatus_Click(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
}
private void button2_Click(object sender, EventArgs e)
{
}
}
}
现在我又添加了2个按钮,button1暂停和button2恢复。由于我找不到任何恢复方法,因此在按暂停时我不得不使用CancelAsync()
函数,并将进度条的值保存在全局变量中。然后,当我按简历时,我再次使用RunWorkerAsync
开始进度栏。但问题是,我无法在此函数中发送全局变量的值,因此它从0进度开始。
我尝试使用thread.sleep(infinite time here)
当有人按暂停,然后停止线程时,有人按简历。问题仍然是,在这种情况下我无法按任何按钮。如果我启用按钮,他们不工作。
请给我一些解决方案。
你应该查找async/await或Reactive Extensions。非常适合这些类型的问题。 – 2013-03-16 19:09:24
@MeirionHughes您能否给我一些链接 – asdfkjasdfjk 2013-03-16 20:05:47