[英]main UI thread is hanging when i am using Background Worker to fill the datagrid
[英]although I am using a background worker GUI still hanging…
我有一個GUI,我必須在其中導入一些文檔,但是當我使用后台工作程序時,GUI掛起了,由於我正在使用后台工作程序,這一定不會發生,為什么會這樣? 請在下面找到代碼。
void ImportNotes_ContextMenuStripItem_Click(object sender, EventArgs e)
{
if (!backgroundWorker_notesImport.IsBusy)
{
mainFrm.ProgressBar.Visible = true;
backgroundWorker_notesImport.RunWorkerAsync();
}
}
private void backgroundWorker_notesImport_DoWork(object sender, DoWorkEventArgs e)
{
ImportNotes();
}
private void backgroundWorker_notesImport_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
mainFrm.ProgressBar.Value = e.ProgressPercentage;
}
void ImportNotes() { }
ImportNotes()
方法是否只需一步就可以完成整個導入?
如果是這樣,那么您仍然不會給UI做任何事情的機會。 MSDN中的示例顯示了應如何使用它:
// This event handler is where the time-consuming work is done.
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
for (int i = 1; i <= 10; i++)
{
if (worker.CancellationPending == true)
{
e.Cancel = true;
break;
}
else
{
// Perform a time consuming operation and report progress.
System.Threading.Thread.Sleep(500);
worker.ReportProgress(i * 10);
}
}
}
您需要有一個循環,該循環允許進行一些處理(在本例中為Sleep
)並調用ReportProgress
。
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