c# - C# 中的 XElement 值

Question

如何在XElement不获取子元素的情况下获取值？

一个例子：

<?xml version="1.0" ?>
<someNode>
    someValue
    <child>1</child>
    <child>2</child>
</someNode>

如果我使用 XElement.Value 来<someNode>获取"somevalue<child>1</child><child>2<child>"字符串，但我只想获取没有"<child>1</child><child>2<child>"子字符串的“somevalue”。

Answer 1

您可以比使用简单一些Descendants- 该Nodes方法仅返回直接子节点：

XElement element = XElement.Parse(
    @"<someNode>somevalue<child>1</child><child>2</child></someNode>");
var firstTextValue = element.Nodes().OfType<XText>().First().Value;

请注意，即使在子元素位于文本节点之前的情况下，这也将起作用，如下所示：

XElement element = XElement.Parse(
    @"<someNode><child>1</child><child>2</child>some value</someNode>");
var firstTextValue = element.Nodes().OfType<XText>().First().Value;

Answer 2

There is no direct way. You'll have to iterate and select. For instance:

var doc = XDocument.Parse(
    @"<someNode>somevalue<child>1</child><child>2</child></someNode>");
var textNodes = from node in doc.DescendantNodes()
                where node is XText
                select (XText)node;
foreach (var textNode in textNodes)
{
    Console.WriteLine(textNode.Value);
}

Answer 3

I think what you want would be the first descendant node, so something like:

var value = XElement.Descendents.First().Value;

Where XElement is the element representing your <someNode> element.

You can specifically ask for the first text element (which is "somevalue"), so you could also do:

var value = XElement.Descendents.OfType<XText>().First().Value;