XmlElement.GetAttribute 方法

定义

命名空间:
System.Xml
程序集:
System.Xml.dll, System.Xml.XmlDocument.dll
程序集:
System.Xml.ReaderWriter.dll
程序集:
System.Xml.XmlDocument.dll
程序集:
System.Xml.dll
程序集:
netstandard.dll

返回指定特性的特性值。Returns the attribute value for the specified attribute.

重载

GetAttribute(String)

返回具有指定名称的属性的值。Returns the value for the attribute with the specified name.
GetAttribute(String, String)

返回具有指定本地名称和命名空间 URI 的特性的值。Returns the value for the attribute with the specified local name and namespace URI.

GetAttribute(String)

返回具有指定名称的属性的值。Returns the value for the attribute with the specified name.

public:
 virtual System::String ^ GetAttribute(System::String ^ name);
public virtual string GetAttribute (string name);
abstract member GetAttribute : string -> string
override this.GetAttribute : string -> string
Public Overridable Function GetAttribute (name As String) As String

参数

name
String

要检索的属性的名称。The name of the attribute to retrieve. 这是限定名。This is a qualified name. 它针对匹配节点的 Name 属性进行匹配。It is matched against the Name property of the matching node.

返回

String

指定的属性的值。The value of the specified attribute. 如果未找到匹配属性，或者如果此属性没有指定值或默认值，则返回空字符串。An empty string is returned if a matching attribute is not found or if the attribute does not have a specified or default value.

示例

下面的示例检查元素是否具有指定的属性。The following example checks to see if the element has the specified attribute.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   XmlDocument^ doc = gcnew XmlDocument;
   doc->LoadXml( "<book genre='novel' ISBN='1-861001-57-5'><title>Pride And Prejudice</title></book>" );
   XmlElement^ root = doc->DocumentElement;
   
   // Check to see if the element has a genre attribute.
   if ( root->HasAttribute( "genre" ) )
   {
      String^ genre = root->GetAttribute( "genre" );
      Console::WriteLine( genre );
   }
}


using System;
using System.IO;
using System.Xml;

public class Sample
{
  public static void Main()
  {

    XmlDocument doc = new XmlDocument();
    doc.LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" +
                "<title>Pride And Prejudice</title>" +
                "</book>");

    XmlElement root = doc.DocumentElement;

    // Check to see if the element has a genre attribute.
    if (root.HasAttribute("genre")){
      String genre = root.GetAttribute("genre");
      Console.WriteLine(genre);
   }
  }
}

Imports System.IO
Imports System.Xml

public class Sample

  public shared sub Main()

    Dim doc as XmlDocument = new XmlDocument()
    doc.LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" & _
                "<title>Pride And Prejudice</title>" & _
                "</book>")      

    Dim root as XmlElement = doc.DocumentElement

    ' Check to see if the element has a genre attribute.
    if (root.HasAttribute("genre"))
     Dim genre as String = root.GetAttribute("genre")
     Console.WriteLine(genre)
    end if
       
    Console.WriteLine("Display the modified XML...")
    Console.WriteLine(doc.InnerXml)

  end sub
end class

适用于

GetAttribute(String, String)

返回具有指定本地名称和命名空间 URI 的特性的值。Returns the value for the attribute with the specified local name and namespace URI.

public:
 virtual System::String ^ GetAttribute(System::String ^ localName, System::String ^ namespaceURI);
public virtual string GetAttribute (string localName, string namespaceURI);
public virtual string GetAttribute (string localName, string? namespaceURI);
abstract member GetAttribute : string * string -> string
override this.GetAttribute : string * string -> string
Public Overridable Function GetAttribute (localName As String, namespaceURI As String) As String

参数

localName
String

要检索的特性的本地名称。The local name of the attribute to retrieve.

namespaceURI
String

要检索的特性的命名空间 URI。The namespace URI of the attribute to retrieve.

返回

String

指定的属性的值。The value of the specified attribute. 如果未找到匹配属性，或者如果此属性没有指定值或默认值，则返回空字符串。An empty string is returned if a matching attribute is not found or if the attribute does not have a specified or default value.

适用于