XmlNodeReader.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 如果目前節點是 (NodeType 等於 XmlNodeType.Element) 且結尾 /> 為 的專案，則為 ，否則 false 為 。

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()
{
   XmlNodeReader^ reader = nullptr;
   try
   {
      
      //Create and load the XML document.
      XmlDocument^ doc = gcnew XmlDocument;
      doc->LoadXml( "<book>"
      "<title>Pride And Prejudice</title>"
      "<price>19.95</price>"
      "<misc/>"
      "</book>" );
      
      //Load the XmlNodeReader 
      reader = gcnew XmlNodeReader( doc );
      
      //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()
  {
    XmlNodeReader reader = null;

    try
    {
       //Create and load the XML document.
       XmlDocument doc = new XmlDocument();
       doc.LoadXml("<book>" +
                   "<title>Pride And Prejudice</title>" +
                   "<price>19.95</price>" +
                   "<misc/>" +
                   "</book>");

       //Load the XmlNodeReader
       reader = new XmlNodeReader(doc);

       //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 XmlNodeReader = Nothing
        
        Try
            'Create and load the XML document.
            Dim doc As New XmlDocument()
            doc.LoadXml("<book>" & _
                        "<title>Pride And Prejudice</title>" & _
                        "<price>19.95</price>" & _
                        "<misc/>" & _
                        "</book>")
            
            'Load the XmlNodeReader 
            reader = New XmlNodeReader(doc)
            
            '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

備註

注意

在 .NET Framework 2.0 中，建議的做法是使用 XmlReaderSettings 類別和 Create 方法建立 XmlReader 實例。 這可讓您充分利用.NET Framework中引進的所有新功能。 如需詳細資訊，請參閱參考頁面中的 XmlReader 一節。

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) 。

不會為空白元素產生對應的 EndElement 節點。