在C#中,Progress<T>
是一个用于在任务之间报告进度的类
Progress<T>
交互的方法中使用 async/await
。这将确保UI线程不会被阻塞,从而提高应用程序的性能和响应性。private async void StartTaskButton_Click(object sender, EventArgs e)
{
await PerformTaskAsync();
}
private async Task PerformTaskAsync()
{
// Your task implementation
}
Progress<T>
实例,并传递一个处理进度更新的回调函数。private async Task PerformTaskAsync()
{
Progress<int> progress = new Progress<int>(value =>
{
// Update UI with the progress value
progressBar.Value = value;
});
await Task.Run(() => DoWork(progress));
}
Report()
方法来报告进度。private void DoWork(IProgress<int> progress)
{
for (int i = 0; i <= 100; i++)
{
// Simulate work
Thread.Sleep(50);
// Report progress
progress.Report(i);
}
}
Progress<T>
构造函数中传递的回调函数中处理进度更新。确保在此回调中执行的操作是线程安全的,因为它们可能在不同的线程上运行。Progress<int> progress = new Progress<int>(value =>
{
// Invoke is required to update UI elements from a non-UI thread
Invoke((Action)(() => progressBar.Value = value));
});
try/catch
块处理任务中可能发生的错误,并在发生异常时通知用户。对于可取消的任务,使用 CancellationToken
来取消任务。private async Task PerformTaskAsync(CancellationToken cancellationToken)
{
Progress<int> progress = new Progress<int>(value =>
{
// Update UI with the progress value
progressBar.Value = value;
});
try
{
await Task.Run(() => DoWork(progress, cancellationToken), cancellationToken);
}
catch (OperationCanceledException)
{
// Handle task cancellation
}
catch (Exception ex)
{
// Handle other exceptions
}
}
遵循这些最佳实践将确保你在C#中有效地使用 Progress<T>
组件,从而提高应用程序的性能和用户体验。