忽略LINQ to XML中的名称空间


Answers:


137

而不是写:

nodes.Elements("Foo")

写:

nodes.Elements().Where(e => e.Name.LocalName == "Foo")

当您厌倦了它时,请制作自己的扩展方法:

public static IEnumerable<XElement> ElementsAnyNS<T>(this IEnumerable<T> source, string localName)
    where T : XContainer
{
    return source.Elements().Where(e => e.Name.LocalName == localName);
}

同上属性,如果您必须经常处理命名空间属性(这种情况比较少见)。

[编辑]为XPath添加解决方案

对于XPath,而不是编写:

/foo/bar | /foo/ns:bar | /ns:foo/bar | /ns:foo/ns:bar

您可以使用local-name()功能:

/*[local-name() = 'foo']/*[local-name() = 'bar']

如果知道所需元素的名称是唯一的,则可以使用以下方法跳过所有中间元素:xDoc.Root.Descendants().Where(e => e.Name.LocalName == "SomeName");
AaronLS 2014年

17

这是一种剥离名称空间的方法:

private static XElement StripNamespaces(XElement rootElement)
{
    foreach (var element in rootElement.DescendantsAndSelf())
    {
        // update element name if a namespace is available
        if (element.Name.Namespace != XNamespace.None)
        {
            element.Name = XNamespace.None.GetName(element.Name.LocalName);
        }

        // check if the element contains attributes with defined namespaces (ignore xml and empty namespaces)
        bool hasDefinedNamespaces = element.Attributes().Any(attribute => attribute.IsNamespaceDeclaration ||
                (attribute.Name.Namespace != XNamespace.None && attribute.Name.Namespace != XNamespace.Xml));

        if (hasDefinedNamespaces)
        {
            // ignore attributes with a namespace declaration
            // strip namespace from attributes with defined namespaces, ignore xml / empty namespaces
            // xml namespace is ignored to retain the space preserve attribute
            var attributes = element.Attributes()
                                    .Where(attribute => !attribute.IsNamespaceDeclaration)
                                    .Select(attribute =>
                                        (attribute.Name.Namespace != XNamespace.None && attribute.Name.Namespace != XNamespace.Xml) ?
                                            new XAttribute(XNamespace.None.GetName(attribute.Name.LocalName), attribute.Value) :
                                            attribute
                                    );

            // replace with attributes result
            element.ReplaceAttributes(attributes);
        }
    }
    return rootElement;
}

用法示例:

XNamespace ns = "http://schemas.domain.com/orders";
XElement xml =
    new XElement(ns + "order",
        new XElement(ns + "customer", "Foo", new XAttribute("hello", "world")),
        new XElement("purchases",
            new XElement(ns + "purchase", "Unicycle", new XAttribute("price", "100.00")),
            new XElement("purchase", "Bicycle"),
            new XElement(ns + "purchase", "Tricycle",
                new XAttribute("price", "300.00"),
                new XAttribute(XNamespace.Xml.GetName("space"), "preserve")
            )
        )
    );

Console.WriteLine(xml.Element("customer") == null);
Console.WriteLine(xml);
StripNamespaces(xml);
Console.WriteLine(xml);
Console.WriteLine(xml.Element("customer").Attribute("hello").Value);

4

当我在寻找一种简单的方法来忽略属性上的命名空间时发现了这个问题时,这是一个扩展程序,用于基于Pavel的回答在访问属性时忽略名称空间(为便于复制,我包括了他的扩展名):

public static XAttribute AttributeAnyNS<T>(this T source, string localName)
where T : XElement
{
    return source.Attributes().SingleOrDefault(e => e.Name.LocalName == localName);
}

public static IEnumerable<XElement> ElementsAnyNS<T>(this IEnumerable<T> source, string localName)
where T : XContainer
{
    return source.Elements().Where(e => e.Name.LocalName == localName);
}
By using our site, you acknowledge that you have read and understand our Cookie Policy and Privacy Policy.
Licensed under cc by-sa 3.0 with attribution required.