c# - 如何不继续取消的任务？

Question

这是一个示例代码:

var task = Task.Factory.StartNew(() => { throw new Exception(); });
task.ContinueWith(t => Console.WriteLine("Exception"), TaskContinuationOptions.OnlyOnFaulted);
task.ContinueWith(t => Console.WriteLine("Success"), TaskContinuationOptions.NotOnFaulted)
    .ContinueWith(t => Console.WriteLine("Should not be executed. Task status = " + t.Status, TaskContinuationOptions.NotOnCanceled));
Console.ReadLine();  

输出是(顺序无关紧要):

Exception

Should not be executed. Task status = Canceled

为什么执行第二个ContinueWith，如何防止？

Answer 1

您上次调用 ContinueWith 时的括号是错误的:

.ContinueWith(t =>
    Console.WriteLine(
        "Should not be executed. Task status = " + t.Status,
        TaskContinuationOptions.NotOnCanceled));

TaskContinuationOptions.NotOnCanceled 作为参数传递给 WriteLine。

固定:

.ContinueWith(t =>
    Console.WriteLine(
        "Should not be executed. Task status = " + t.Status),
    TaskContinuationOptions.NotOnCanceled);