我想了解如何在使用异步/等待模式时从事件更新UI。 以下是我在WinForm应用程序上使用的测试代码。我甚至不确定这是否正确。有什么必要允许pwe_StatusUpdate方法更新UI?在那里引发了跨线程操作错误。使用asyc等待事件更新UI
感谢您的阅读。
// calling code
ProcessWithEvents pwe = new ProcessWithEvents();
pwe.StatusUpdate += pwe_StatusUpdate;
await pwe.Run();
void pwe_StatusUpdate(string updateMsg)
{
// Error Here: Cross-thread operation not valid: Control '_listBox_Output' accessed from a thread other than the thread it was created on.
_listBox_Output.Items.Add(updateMsg);
}
-
// Class with long running process and event
public delegate void StatusUpdateHandler(string updateMsg);
public class ProcessWithEvents
{
public event StatusUpdateHandler StatusUpdate;
public async Task Run()
{
await Task.Run(() =>
{
for (int i = 0; i < 10; i++)
{
RaiseUpdateEvent(String.Format("Update {0}", i));
Thread.Sleep(500);
}
});
}
private void RaiseUpdateEvent(string msg)
{
if (StatusUpdate != null)
StatusUpdate(msg);
}
}
-
“//调用代码”部分中的ProcessWithProgress应该是“ProcessWithUpdates”吗? –
@Brock:是的。编辑。 –