c# – 用户代码是否重新抛出OperationCanceledException,从其自己的try-catch中捕获

观察cancelToken取消请求的推荐方法似乎是ThrowIfCancellationRequested.

但如果被用户try-catch捕获会发生什么?从MSDN’s “How to: Cancel a Task and Its Children”开始添加try-catch来说明问题:

snippet:

static void DoSomeWork(int taskNum, CancellationToken ct)
{
   try
   {
        for (int i = 0; i < maxIterations; i++)
        {
            // Do a bit of work. Not too much. 
            ...
            //ok not to do this check? most likely IsCancellationRequested does it already
            //if (ct.IsCancellationRequested)
            //{


                ct.ThrowIfCancellationRequested();


            //}
        }
    }
    catch(OperationCanceledException e1) // catching likely my own exception 
    {
       throw; // correct? anything else belongs here?
    }
    catch // ...
    {
        // do whatever else I might want to do here
    }
}

我好好重新投掷?即我没有打扰任务API内部的任何内容,是吗?

(我也会表达个人观点,有条不紊地取消 – 清理 – 返回的点似乎与例外是它的载体不一致;我认为还有其他方法可以实现这一点 – 我会继续挖掘)

最佳答案 重新抛出应该没问题.但是不建议使用无参数捕获,因为它会吞下任何异常信息.您应该使用catch(Exception)并至少记录这些异常.

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