XmlTextReader.IsEmptyElement 屬性

定義

命名空間:

System.Xml

組件:

System.Xml.ReaderWriter.dll

組件:

System.Xml.dll

組件:

netstandard.dll

取得值，指出目前的節點是否為空項目 (例如 <MyElement/>)。

public:
 virtual property bool IsEmptyElement { bool get(); };

public override bool IsEmptyElement { get; }

member this.IsEmptyElement : bool

Public Overrides ReadOnly Property IsEmptyElement As Boolean

屬性值

Boolean

true 如果目前的節點是專案 (NodeType 等於 XmlNodeType.Element 結尾 />) 則為 ，否則為 false 。

範例

下列範例會顯示每個專案的文字內容。

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   XmlTextReader^ reader = nullptr;
   try
   {
      
      //Load the reader with the XML file.
      reader = gcnew XmlTextReader( "elems.xml" );
      
      //Parse the XML and display the text content of each of the elements.
      while ( reader->Read() )
      {
         if ( reader->IsStartElement() )
         {
            if ( reader->IsEmptyElement )
                        Console::WriteLine( "<{0}/>", reader->Name );
            else
            {
               Console::Write( "<{0}> ", reader->Name );
               reader->Read(); //Read the start tag.
               if ( reader->IsStartElement() )
                              
               //Handle nested elements.
               Console::Write( "\r\n<{0}>", reader->Name );
               Console::WriteLine( reader->ReadString() ); //Read the text content of the element.
            }
         }
      }
   }
   finally
   {
      if ( reader != nullptr )
            reader->Close();
   }

}

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

public class Sample
{
  public static void Main()
  {
    XmlTextReader reader = null;

    try
    {
       //Load the reader with the XML file.
       reader = new XmlTextReader("elems.xml");

       //Parse the XML and display the text content of each of the elements.
       while (reader.Read()){
         if (reader.IsStartElement()){
           if (reader.IsEmptyElement)
                    {
                        Console.WriteLine("<{0}/>", reader.Name);
                    }
                    else
                    {
               Console.Write("<{0}> ", reader.Name);
               reader.Read(); //Read the start tag.
               if (reader.IsStartElement())  //Handle nested elements.
                 Console.Write("\r\n<{0}>", reader.Name);
               Console.WriteLine(reader.ReadString());  //Read the text content of the element.
           }
         }
       }
     }

     finally
     {
        if (reader != null)
          reader.Close();
      }
  }
} // End class

Option Strict
Option Explicit

Imports System.IO
Imports System.Xml

Public Class Sample
    
    Public Shared Sub Main()
        Dim reader As XmlTextReader = Nothing
        
        Try
            'Load the reader with the XML file.
            reader = New XmlTextReader("elems.xml")
            
            'Parse the XML and display the text content of each of the elements.
            While reader.Read()
                If reader.IsStartElement() Then
                    If reader.IsEmptyElement Then
                        Console.WriteLine("<{0}/>", reader.Name)
                    Else
                        Console.Write("<{0}>" + " ", reader.Name)
                        reader.Read() 'Read the start tag.
                        If (reader.IsStartElement())  'Handle nested elements.
                          Console.WriteLine()
                          Console.Write("<{0}>", reader.Name)
                        End If
                        Console.WriteLine(reader.ReadString()) 'Read the text content of the element.
                    End If
                End If
            End While
        
        
        Finally
            If Not (reader Is Nothing) Then
                reader.Close()
            End If
        End Try
    End Sub
End Class

此範例會使用 檔案 elems.xml ，作為輸入。

<book>
  <title>Pride And Prejudice</title>
  <price>19.95</price>
  <misc/>
</book>

備註

注意

從 .NET Framework 2.0 開始，建議您使用 XmlReader.Create 方法來建立 XmlReader 實例，以利用新功能。

此屬性可讓您判斷下列各項目之間的差異：

<item num="123"/>``IsEmptyElement () true 。

<item num="123">``IsEmptyElement (為 false ，雖然元素內容是空的) 。

不會為空專案產生對應的 EndElement 節點。

IsEmptyElement 只要報告原始檔案中的專案是否有結束專案標記。

另請參閱

• XmlReader