我是 C# 新手。我发现了一些适用于进度条的代码。什么是，当有人点击按钮开始时btnStartAsyncOperation_Click，进度条开始增加，当btnCancel_Click按下它时取消操作。这是代码
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，按钮 1 暂停，按钮 2 恢复。由于我找不到任何恢复的方法，所以我必须CancelAsync()在按下暂停时使用函数，并将进度条的值保存在全局变量中。然后，当我按下 resume 时，我再次使用RunWorkerAsync. 但问题是，我不能在这个函数中发送全局变量的值，所以它从 0 进度开始。
我尝试thread.sleep(infinite time here)在有人按下暂停时使用，然后在有人按下恢复时停止线程。问题仍然是，在这种情况下我无法按下任何按钮。如果我启用按钮，它们仍然不起作用。
请给我一些解决方案。