在C＃中返回错误计数结果的任务

Question

我使用Task.Factory.StartNew异步调用Sync方法。一旦异步完成，我需要它的结果。我并行运行这个任务，每个结果在下面的结果相结合 -

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，我收到清单的计数改变所有的时间。它假设是作为输入的提名数。

请你让我知道如何解决这个问题。

非常感谢，包括Thirumalai中号

Answer 1

两个选项

1. 变化submitedList是并发的类型，比如ConcurrentBag<T>。在您的后续问题的预期，这里的why you can't just use a concurrent list :)

2. Put a lock around all of your submitedList operations