Web API和取消令牌

我正在尝试将Web API和取消令牌协同工作,但由于某些原因它似乎没有很好地发挥作用.

这是我的Web API的代码.它包含取消令牌属性和方法

public class TokenCancellationApiController : ApiController
{
    private static CancellationTokenSource cTokenSource = new CancellationTokenSource();
    // Create a cancellation token from CancellationTokenSource
    private static CancellationToken cToken = cTokenSource.Token;
    // Create a task and pass the cancellation token

    [HttpGet]
    public string BeginLongProcess()
    {
        string returnMessage = "The running process has finished!";
        try
        {
            LongRunningFunc(cToken, 6);
        }
        catch (OperationCanceledException cancelEx)
        {
            returnMessage = "The running process has been cancelled.";
        }
        finally
        {
            cTokenSource.Dispose();
        }
        return returnMessage;
    }

    [HttpGet]
    public string CancelLongProcess()
    {
        // cancelling task
        cTokenSource.Cancel();
        return "Cancellation Requested";
    }

    private static void LongRunningFunc(CancellationToken token, int seconds)
    {
        Console.WriteLine("Long running method");
        for (int j = 0; j < seconds; j++)
        {
            Thread.Sleep(1000);
            if (token.IsCancellationRequested)
            {
                Console.WriteLine("Cancellation observed.");
                throw new OperationCanceledException(token); // acknowledge cancellation
            }
        }
        Console.WriteLine("Done looping");
    }
}

我有以下HTML代码:

    

        Begin Long Process
    
    

        Cancel Long Process
    

Web API方法被称为罚款.当我单击按钮开始漫长的过程,然后点击取消时,我希望它取消漫长的过程,并返回一条警告消息,告诉我它被取消了.

但事实并非如此.虽然有一个令牌取消请求,但它似乎没有注册,并且长进程一直运行直到它完成.

任何人都可以告诉我为什么这不起作用,因为我想要它？