Question

我正在使用Task.Factory.StartNew异步调用Sync方法。 Async完成后，我需要它的结果。我正在并行运行此任务，并将每个结果组合在一个结果中，如下所示 -

public List<Nomination> Submit(List<Nomination> nominations, string userEmail)
{
    var sublist = new List<Nomination>();
    int nSize = 5;
    var submitedList = new List<Nomination>();

    List<Task> tasks = new List<Task>();

    for (int index = 0; index < nominations.Count; index += nSize) // No nominations in a batch
    {
        sublist = nominations.GetRange(index, Math.Min(nSize, nominations.Count - index));

        //SubmitNomination is sync method which does some db operation and returns a List<Nomination>
        Task<List<DTO.FeedbackRequest>> task = Task.Factory.StartNew( () => { return SubmitNomination(sublist, userEmailName); });  

        Task cont = task.ContinueWith(submitted => {
            submitedList.AddRange(submitted.Result);
        });

        tasks.Add(cont);
    }
    Task.WaitAll(tasks.ToArray());

    return submitedList;
}

当我看到submitedList时，我得到的列表计数一直在变化。它假设是作为输入的提名计数。

请告诉我如何解决这个问题。

非常感谢，Thirumalai M

Answer 1

两个选项

将submitedList更改为并发类型，例如ConcurrentBag<T>。在预期您的后续问题时，请why you can't just use a concurrent list：）
Put a lock around all of your submitedList operations

任务在C＃中返回错误的结果计数

1 个答案: