如何根据应用条件取消线程任务

Question

我是 Task 的新手，也许我的问题会很愚蠢，但我真的需要帮助。

我想根据应用情况取消任务。

好吧，我们开始吧：

    static void Main(string[] args)
    {
    var tokenSource = new CancellationTokenSource();
    var token = tokenSource.Token;

    // Request cancellation from the UI thread.
    if (Console.ReadKey().KeyChar == 'x')
    {
    tokenSource.Cancel();
    }
    Task.Factory.StartNew(() => DoSomeWork(token), token);
    }

这里是我们的 DoSomeWork 方法：

    static void DoSomeWork(CancellationToken ct)
    {
    // Was cancellation already requested?
    if (ct.IsCancellationRequested)
    {
     Console.WriteLine("We were cancelled before we got started.");
     Console.WriteLine("DoSomeWork() - Not Executed");
     return;
    }
    Console.WriteLine("DoSomeWork() - Executed");
    Console.ReadLine();
    }

所以，我希望当我打电话时 tokenSource.Cancel();

此条件为真：

    if (ct.IsCancellationRequested)
    {
     Console.WriteLine("We were cancelled before we got started.");
     Console.WriteLine("DoSomeWork() - Not Executed");
     return;
    }

我将在 if 语句中执行代码。

我确实做错了，需要了解如何达到上述目标的确切步骤。

提前谢谢你。 朱利安

Answer 1

我认为你需要类似的东西：

while (!ct.IsCancellationRequested /* or all work is done*/)
{
    Console.WriteLine("DoSomeWork");
}
Console.WriteLine("We were cancelled.");