问题标签 [iqueryable.toarray]

I have a LinqToSql query that returns an array of Article objects like so:

I then loop over this array and start to delete some items that meet a certain criteria, for simplicity let's say I delete them all, like so:

The call to DeleteOnSubmit(entity) throws an invalid operation exception, it's message says "Can not delete an entity that has not been attached". I modified the code to get the entity first then delete it and it worked just fine. Here's the working code:

Now, I know it would work if I modified the repository to return IQueryable instead of a native array, I just don't understand why? Does ToArray has anything to do with this invalid operation exception?
Thanks.
ps: db is a reference to a DataContext object.

这让我很难过。以下代码返回“,,,,,”：

为什么？！它快把我逼疯了！有什么建议么？

使用该.ToArray()函数时，是否有必要隐式定义数组的大小以保存要转换的列表中的字符？

我尝试这样做是因为我需要使用.GetValue()数组的功能，但是，数组保持大小为 1 并且不保存列表中的材料。我是否试图.ToArray()错误地使用？

这是我拥有的所有影响数组的代码。当我Console.WriteLine()列出清单时，它给了我整个文本。我可能对列表的工作方式感到困惑。是否将所有内容都存储为单个项目，这就是数组只显示一个位置的原因？