HOW TO：變更整個 XML 樹狀結構的命名空間
更新： November 2007
您有時候必須以程式設計的方式，變更項目或屬性的命名空間。LINQ to XML 可以簡化這個程序。您可以設定 XElement.Name 屬性。您無法設定 XAttribute.Name 屬性 (Property)，但是您可以輕易地將屬性 (Attribute) 複製到 System.Collections.Generic.List<T>、移除現有的屬性 (Attribute)，然後加入所需之新命名空間中的新屬性 (Attribute)。
如需詳細資訊，請參閱使用 XML 命名空間。
範例
下列程式碼會在沒有命名空間中建立兩個 XML 樹狀結構。接著，它會變更每個樹狀結構的命名空間，然後將這些命名空間結合成單一樹狀結構。
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)
此範例會產生下列輸出：
<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>