c# - 检查 LINQ to XML 中的单独节点

Question

如何确定标签是否为以下格式:<Closed />在 Linq To XML 中？

Answer 1

您可以使用 XElement.IsEmpty property .请注意 IsEmpty 检查的内容，如链接的 MSDN 页面上的注释所定义:

Note that an element that contains a start and end tag with no content between the tags is not considered to be an empty element. It has content with no length. Only an element that contains only a start tag, and is expressed as a terminated empty element, is considered to be empty.

为了说明，请考虑以下示例:

var xml = XElement.Parse(@"<root>
    <pair>foo</pair>
    <pair></pair>
    <single id=""42"" />
    <single />
</root>");

foreach (var element in xml.Elements())
{
    Console.WriteLine("{0}: {1}", element.IsEmpty, element);
}

// False: <pair>foo</pair>
// False: <pair></pair>
// True: <single id="42" />
// True: <single />

如果要检查节点 IsEmpty 并且没有属性，请添加检查 element.Attributes().Any() 是否为 false 。