从表单中取消并行循环

Question

我有一个带有文本框的 C# 表单。

我想要运行一个事件，这样每次在文本框中更改文本时它都会取消最后一个 parallel.for 循环并使用新信息重新启动，但是我不知道如何当此事件为运行.

时，检索旧的取消令牌以取消上一次迭代

我希望下面的代码能解释我想做什么

private void Textbox_TextChanged(object sender, EventArgs e)
    {

       //call previous cancellation token from Textbox.tag and execute

        CancellationTokenSource cts = new CancellationTokenSource();
        ParallelOptions op = new ParallelOptions();
        op.CancellationToken = cts.Token;
        Parallel.For(0, 1, op, t =>
        {
            //Store cancellation token in textbox.tag

            //do stuff
        });
    }

提前致谢

Answer 1

您需要 declare/store 它在方法范围之外：

private CancellationTokenSource cts = new CancellationTokenSource();
private ParallelOptions op = new ParallelOptions();

private void Textbox_TextChanged(object sender, EventArgs e)
    {

        //call previous cancellation token from Textbox.tag and execute
        cts.Cancel();

        cts = new CancellationTokenSource();
        op = new ParallelOptions();

        op.CancellationToken = cts.Token;
        Parallel.For(0, 1, op, t =>
        {
            //do stuff
        });
    }

从表单中取消并行循环

Cancel Parallel loop from form

c#

wpf

cancellation

cancellationtokensource