如何：更改整个 XML 树的命名空间
更新：November 2007
有时需要以编程方式更改元素或属性的命名空间。 LINQ to XML 可简化此任务。 可以设置 XElement.Name 属性。 不能设置 XAttribute.Name 属性 (Property)，但是很容易将属性 (Attribute) 复制到 System.Collections.Generic.List<T> 中，移除现有属性 (Attribute)，然后添加位于新命名空间中的新属性 (Attribute)。
有关更多信息，请参见使用 XML 命名空间。
示例
下面的代码创建两个不在命名空间中的 XML 树。 然后更改每个树的命名空间，再将它们合并到一个树中。
XElement tree1 = new XElement("Data",
new XElement("Child", "content",
new XAttribute("MyAttr", "content")
)
);
XElement tree2 = new XElement("Data",
new XElement("Child", "content",
new XAttribute("MyAttr", "content")
)
);
XNamespace aw = "https://www.adventure-works.com";
XNamespace ad = "http://www.adatum.com";
// change the namespace of every element and attribute in the first tree
foreach (XElement el in tree1.DescendantsAndSelf())
{
el.Name = aw.GetName(el.Name.LocalName);
List<XAttribute> atList = el.Attributes().ToList();
el.Attributes().Remove();
foreach (XAttribute at in atList)
el.Add(new XAttribute(aw.GetName(at.Name.LocalName), at.Value));
}
// change the namespace of every element and attribute in the second tree
foreach (XElement el in tree2.DescendantsAndSelf())
{
el.Name = ad.GetName(el.Name.LocalName);
List<XAttribute> atList = el.Attributes().ToList();
el.Attributes().Remove();
foreach (XAttribute at in atList)
el.Add(new XAttribute(ad.GetName(at.Name.LocalName), at.Value));
}
// add attribute namespaces so that the tree will be serialized with
// the aw and ad namespace prefixes
tree1.Add(
new XAttribute(XNamespace.Xmlns + "aw", "https://www.adventure-works.com")
);
tree2.Add(
new XAttribute(XNamespace.Xmlns + "ad", "http://www.adatum.com")
);
// create a new composite tree
XElement root = new XElement("Root",
tree1,
tree2
);
Console.WriteLine(root);
Dim tree1 As XElement = _
<Data>
<Child MyAttr="content">content</Child>
</Data>
Dim tree2 As XElement = _
<Data>
<Child MyAttr="content">content</Child>
</Data>
Dim aw As XNamespace = "https://www.adventure-works.com"
Dim ad As XNamespace = "http://www.adatum.com"
' change the namespace of every element and attribute in the first tree
For Each el As XElement In tree1.DescendantsAndSelf
el.Name = aw.GetName(el.Name.LocalName)
Dim atList As List(Of XAttribute) = el.Attributes().ToList()
el.Attributes().Remove()
For Each at As XAttribute In atList
el.Add(New XAttribute(aw.GetName(at.Name.LocalName), at.Value))
Next
Next
' change the namespace of every element and attribute in the second tree
For Each el As XElement In tree2.DescendantsAndSelf()
el.Name = ad.GetName(el.Name.LocalName)
Dim atList As List(Of XAttribute) = el.Attributes().ToList()
el.Attributes().Remove()
For Each at As XAttribute In atList
el.Add(New XAttribute(ad.GetName(at.Name.LocalName), at.Value))
Next
Next
' add attribute namespaces so that the tree will be serialized with
' the aw and ad namespace prefixes
tree1.Add( _
New XAttribute(XNamespace.Xmlns + "aw", "https://www.adventure-works.com") _
)
tree2.Add( _
New XAttribute(XNamespace.Xmlns + "ad", "http://www.adatum.com") _
)
' create a new composite tree
Dim root As XElement = _
<Root>
<%= tree1 %>
<%= tree2 %>
</Root>
Console.WriteLine(root)
本示例生成以下输出：
<Root>
<aw:Data xmlns:aw="https://www.adventure-works.com">
<aw:Child aw:MyAttr="content">content</aw:Child>
</aw:Data>
<ad:Data xmlns:ad="http://www.adatum.com">
<ad:Child ad:MyAttr="content">content</ad:Child>
</ad:Data>
</Root>