XmlReader.Prefix 属性

定义

当在派生类中被重写时,获取与当前节点关联的命名空间前缀。When overridden in a derived class, gets the namespace prefix associated with the current node.

public:
 abstract property System::String ^ Prefix { System::String ^ get(); };
public abstract string Prefix { get; }
member this.Prefix : string
Public MustOverride ReadOnly Property Prefix As String

属性值

String

与当前节点关联的命名空间前缀。The namespace prefix associated with the current node.

例外

在上一次异步操作完成之前调用了 XmlReader 方法。An XmlReader method was called before a previous asynchronous operation finished. 在此情况下,会引发 InvalidOperationException 并显示消息“异步操作已在进行中。”In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

示例

下面的示例显示每个节点的本地名称,并显示前缀和命名空间 URI (如果存在)。The following example displays the local name of each node, and, if they exist, the prefix and namespace URI.

XmlReader reader = XmlReader.Create("book2.xml");

// Parse the file.  If they exist, display the prefix and
// namespace URI of each node.
while (reader.Read()) {
  if (reader.IsStartElement()) {
    if (reader.Prefix==String.Empty)
                {
                    Console.WriteLine("<{0}>", reader.LocalName);
                }
                else {
      Console.Write("<{0}:{1}>", reader.Prefix, reader.LocalName);
      Console.WriteLine(" The namespace URI is " + reader.NamespaceURI);
    }
  }
}
reader.Close();
Dim reader As XmlReader = XmlReader.Create("book2.xml")
        
' Parse the file.  If they exist, display the prefix and 
' namespace URI of each node.
While reader.Read()
  If reader.IsStartElement() Then
    If reader.Prefix = String.Empty Then
      Console.WriteLine("<{0}>", reader.LocalName)
    Else
      Console.Write("<{0}:{1}>", reader.Prefix, reader.LocalName)
      Console.WriteLine(" The namespace URI is " + reader.NamespaceURI)
    End If
  End If
End While
reader.Close()

该示例使用文件(book2.xml)作为输入。The example uses the file, book2.xml, as input.

<book xmlns:bk='urn:samples'>
  <title>Pride And Prejudice</title>
  <bk:genre>novel</bk:genre>
</book>

适用于