如何向文档添加XElement，避免“结构不正确的文档”错误?

        // Remove element with ID of 1
        var userIds = from user in document.Descendants("Id")
                       where user.Value == "1"
                       select user;

        userIds.Remove();

        SaveAndDisplay(document);

        // Add element back
        var newElement = new XElement("Id", "0", 
            new XElement("Balance", "3000"));
        document.Add(newElement);

        SaveAndDisplay(document);

The add element back block is the problem. As when it gets to the add it states:

添加元素后块是问题所在。当它到达add时，它说:

This operation would create an incorrectly structured document.

这个操作将创建一个不正确的结构文档。

What stupid mistake am I making?

我犯了什么愚蠢的错误?

Edit:

编辑:

Yes, I was reading as an XDocument, not XElement. Any advice on when to favour one or the other?

是的，我读的是XDocument，不是XElement。对于什么时候该支持哪一方，有什么建议吗?

2 个解决方案

#1

It looks like you are trying to add a new element as a child of your document's root. If so, then you need to change your Add statement to the following.

看起来您正在尝试添加一个新元素作为文档根的子元素。如果是，那么您需要将添加语句更改为以下内容。

var newElement = new XElement("Id", "0", new XElement("Balanace", "3000"));
document.Root.Add(newElement);

Adding directly to the document adds another root element, which violates the XML structure.

直接向文档添加另一个根元素，这违反了XML结构。

#2

You're effectively trying to add a new root element, which these objects don't like. I assume document is an XDocument? Place it further inside the root node, by adding it to the root node. Use:

您实际上正在尝试添加一个新的根元素，这些对象不喜欢。我认为document是XDocument?通过将其添加到根节点中，将其进一步放置到根节点中。使用:

document.Root.Add(newElement) or document.FirstNode.Add(newElement)

document.Root.Add(newElement)或document.FirstNode.Add(newElement)

#1