XmlTextReader.WhitespaceHandling 属性

定义

命名空间:

System.Xml

程序集:

System.Xml.ReaderWriter.dll

Source:

XmlTextReader.cs

获取或设置一个值，该值指定如何处理空白区域。

public:
 property System::Xml::WhitespaceHandling WhitespaceHandling { System::Xml::WhitespaceHandling get(); void set(System::Xml::WhitespaceHandling value); };

public System.Xml.WhitespaceHandling WhitespaceHandling { get; set; }

member this.WhitespaceHandling : System.Xml.WhitespaceHandling with get, set

Public Property WhitespaceHandling As WhitespaceHandling

属性值

WhitespaceHandling

WhitespaceHandling 值之一。 默认值为 WhitespaceHandling.All（返回 Whitespace 和 SignificantWhitespace 节点）。

例外

ArgumentOutOfRangeException

指定了无效的值。

InvalidOperationException

当读取器关闭（ReadState 为 ReadState.Closed）时，设置此属性。

示例

以下示例读取 XML 片段。

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
void ReadXML( XmlParserContext^ context, String^ xmlFrag, WhitespaceHandling ws )
{
   
   //Create the reader and specify the WhitespaceHandling setting.
   XmlTextReader^ reader = gcnew XmlTextReader( xmlFrag,XmlNodeType::Element,context );
   reader->WhitespaceHandling = ws;
   
   //Parse the XML and display each of the nodes.
   while ( reader->Read() )
   {
      switch ( reader->NodeType )
      {
         case XmlNodeType::Element:
            Console::WriteLine( "{0}: <{1}>", reader->NodeType, reader->Name );
            break;

         case XmlNodeType::Text:
            Console::WriteLine( "{0}: {1}", reader->NodeType, reader->Value );
            break;

         case XmlNodeType::EndElement:
            Console::WriteLine( "{0}: </{1}>", reader->NodeType, reader->Name );
            break;

         case XmlNodeType::Whitespace:
            Console::WriteLine( "{0}:", reader->NodeType );
            break;

         case XmlNodeType::SignificantWhitespace:
            Console::WriteLine( "{0}:", reader->NodeType );
            break;
      }
   }

   
   //Close the reader.
   reader->Close();
}

int main()
{
   
   //Create the XML fragment to be parsed.
   String^ xmlFrag = "<book> "
   "  <title>Pride And Prejudice</title>"
   "  <genre>novel</genre>"
   "</book>";
   
   //Create the XmlNamespaceManager.
   NameTable^ nt = gcnew NameTable;
   XmlNamespaceManager^ nsmgr = gcnew XmlNamespaceManager( nt );
   
   //Create the XmlParserContext.
   XmlParserContext^ context = gcnew XmlParserContext( nullptr,nsmgr,nullptr,XmlSpace::Default );
   Console::WriteLine( "Read the XML and ignore all white space..." );
   ReadXML( context, xmlFrag, WhitespaceHandling::None );
   Console::WriteLine( "\r\nRead the XML including white space nodes..." );
   ReadXML( context, xmlFrag, WhitespaceHandling::All );
}

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

public class Sample
{
  public static void Main(){

    //Create the XML fragment to be parsed.
    string xmlFrag ="<book> " +
                    "  <title>Pride And Prejudice</title>" +
                    "  <genre>novel</genre>" +
                    "</book>";

    //Create the XmlNamespaceManager.
    NameTable nt = new NameTable();
    XmlNamespaceManager nsmgr = new XmlNamespaceManager(nt);

    //Create the XmlParserContext.
    XmlParserContext context = new XmlParserContext(null, nsmgr, null, XmlSpace.Default);

    Console.WriteLine("Read the XML and ignore all white space...");
    ReadXML(context, xmlFrag, WhitespaceHandling.None);

    Console.WriteLine("\r\nRead the XML including white space nodes...");
    ReadXML(context, xmlFrag, WhitespaceHandling.All);
  }

  public static void ReadXML(XmlParserContext context, string xmlFrag, WhitespaceHandling ws){

    //Create the reader and specify the WhitespaceHandling setting.
    XmlTextReader reader = new XmlTextReader(xmlFrag, XmlNodeType.Element, context);
    reader.WhitespaceHandling = ws;

      //Parse the XML and display each of the nodes.
      while (reader.Read())
      {
         switch (reader.NodeType)
         {
           case XmlNodeType.Element:
             Console.WriteLine("{0}: <{1}>", reader.NodeType, reader.Name);
             break;
           case XmlNodeType.Text:
             Console.WriteLine("{0}: {1}", reader.NodeType, reader.Value);
             break;
           case XmlNodeType.EndElement:
             Console.WriteLine("{0}: </{1}>", reader.NodeType, reader.Name);
             break;
           case XmlNodeType.Whitespace:
             Console.WriteLine("{0}:", reader.NodeType);
             break;
           case XmlNodeType.SignificantWhitespace:
             Console.WriteLine("{0}:", reader.NodeType);
             break;
         }
      }

    //Close the reader.
    reader.Close();
  }
} // End class

Imports System.IO
Imports System.Xml

public class Sample 

  public shared sub Main()

    'Create the XML fragment to be parsed.
    Dim xmlFrag as string ="<book> " & _
                           "  <title>Pride And Prejudice</title>" & _
                           "  <genre>novel</genre>" & _
                           "</book>" 

    'Create the XmlNamespaceManager.
    Dim nt as NameTable = new NameTable()
    Dim nsmgr as XmlNamespaceManager = new XmlNamespaceManager(nt)

    'Create the XmlParserContext.
    Dim context as XmlParserContext = new XmlParserContext(nothing, nsmgr, nothing, XmlSpace.Default)

    Console.WriteLine("Read the XML and ignore all white space...")
    ReadXML(context, xmlFrag, WhitespaceHandling.None)

    Console.WriteLine()
    Console.WriteLine("Read the XML including white space nodes...")
    ReadXML(context, xmlFrag, WhitespaceHandling.All)
  end sub
  
  public shared sub ReadXML(context as XmlParserContext, xmlFrag as string, ws as WhitespaceHandling)

    'Create the reader and specify the WhitespaceHandling setting.
    Dim reader as XmlTextReader = new XmlTextReader(xmlFrag, XmlNodeType.Element, context)
    reader.WhitespaceHandling = ws

      'Parse the XML and display each of the nodes.
      while (reader.Read())
         select case reader.NodeType
           case XmlNodeType.Element:
             Console.WriteLine("{0}: <{1}>", reader.NodeType, reader.Name)
           case XmlNodeType.Text:
             Console.WriteLine("{0}: {1}", reader.NodeType, reader.Value)
           case XmlNodeType.EndElement:
             Console.WriteLine("{0}: </{1}>", reader.NodeType, reader.Name)
           case XmlNodeType.Whitespace:
             Console.WriteLine("{0}:", reader.NodeType)
           case XmlNodeType.SignificantWhitespace:
             Console.WriteLine("{0}:", reader.NodeType)
         end select       
      end while           
  
    'Close the reader.
    reader.Close()     
  
  end sub
end class

注解

注意

从 .NET Framework 2.0 开始，建议使用 XmlReader.Create 方法创建XmlReader实例，以利用新功能。

此属性可以随时更改，并在下一个读取操作中生效。

XmlTextReader由于 没有可用的 DTD 信息，SignificantWhitespace因此仅在范围内xml:space='preserve'返回节点。

另请参阅

• XmlReader