公共属性的设置器将“值”分配给集合时出现序列化错误

您的代码应更改为：

set
{
    int itemIndex = 1;
    if (initialStopCollection == null) initialStopCollection = new ...; // your initialStopCollection is null. Create new one
    if (itemIndex >= initialStopCollection.Count) // Two few items, create new
    {
        for (int i = initialStopCollection.Count; i <= itemIndex; i++)
        {
            initialStopCollection.Add(new ...);
        }
    }
    if (initialStopCollection[itemIndex] == null) initialStopCollection[itemIndex] = new ... ; // This item is not initialized, create new
    initialStopCollection[itemIndex].BufferUAbsolute = value;
}