在C＃中返回錯誤計數結果的任務

Question

我使用Task.Factory.StartNew異步調用Sync方法。一旦異步完成，我需要它的結果。我並行運行這個任務，每個結果在下面的結果相結合 -

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; 
} 

當我看到submitedList，我收到清單的計數改變所有的時間。它假設是作爲輸入的提名數。

請你讓我知道如何解決這個問題。

非常感謝，包括Thirumalai中號

Answer 1

兩個選項

1. 變化submitedList是併發的類型，比如ConcurrentBag<T>。在您的後續問題的預期，這裏的why you can't just use a concurrent list :)

2. Put a lock around all of your submitedList operations