在C＃中中止文件导入操作

Question

I want to implement abort/cancel file import operation in c#. I am using below code to achieve this -

CancellationTokenSource ctokensource;
            if (_importtasks.TryGetValue(Convert.ToInt32(jobHistoryRecno), out ctokensource))
                ctokensource.Cancel();

Even though, it execute above function successfully, It fails to cancel the task. still import is keep going.

Could you please help me how to achieve abort/cancel functionality on file import.

Regards Rajiv Kumar

Answer 1

Cancel just informs attached token (which you can get with CancellationTokenSource.Token property) about cancellation. You should cancel your operation manually by either checking CancellationToken.IsCancellationRequested or calling CancellationToken.ThrowIfCancellationRequested() , the second method should be used if operation is wrapped with Task . Also you can register the necessary callback with CancellationToken.Register method, which will be executed when cancellation requested.