LIST<> AddRange抛出ArgumentException [英] LIST<> AddRange throwing ArgumentException

问题描述

我有一种特殊的方法偶尔会用ArgumentException崩溃：

I have a particular method that is occasionally crashing with an ArgumentException:

Destination array was not long enough. Check destIndex and length, and the array's lower bounds.:
at System.Array.Copy(Array sourceArray, Int32 sourceIndex, Array destinationArray, Int32 destinationIndex, Int32 length, Boolean reliable)
at System.Collections.Generic.List`1.CopyTo(T[] array, Int32 arrayIndex)
at System.Collections.Generic.List`1.InsertRange(Int32 index, IEnumerable`1 collection)
at System.Collections.Generic.List`1.AddRange(IEnumerable`1 collection)

导致此崩溃的代码看起来如下所示：

The code that is causing this crash looks something like this:

List<MyType> objects = new List<MyType>(100);
objects = FindObjects(someParam);
objects.AddRange(FindObjects(someOtherParam);

根据MSDN，List<>。如果需要，AddRange（）会自动调整自己的大小：

According to MSDN, List<>.AddRange() should automatically resize itself as needed:

如果新的Count（当前Count加上collection的大小）将大于容量，通过自动重新分配内部阵列以适应新的元素，增加List<（Of（）的容量），并且现有元素在新元素之前被复制到新数组添加了

有人会想到AddRange可能会抛出此类异常的情况吗？

Can someone think of a circumstance in which AddRange could throw this type of exception?

编辑：

回答有关FindObjects（）方法的问题。它基本上看起来像这样：

In response to questions about the FindObjects() method. It basically looks something like this:

List<MyObject> retObjs = new List<MyObject>();

foreach(MyObject obj in objectList)
{
   if(someCondition)
       retObj.Add(obj);
}

推荐答案

同一列表从多线程？这可能会导致问题... 列表< T> 对于多个作者是不安全的。

Are you trying to update the same list from multiple threads? That could cause problems... List<T> isn't safe for multiple writers.

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