XmlReader.Value Properti

Definisi

Ruang nama:
System.Xml
Rakitan:
System.Xml.dll, System.Xml.ReaderWriter.dll
Rakitan:
netstandard.dll, System.Xml.ReaderWriter.dll
Rakitan:
System.Xml.ReaderWriter.dll
Rakitan:
System.Xml.dll
Rakitan:
netstandard.dll
Sumber:
XmlReader.cs
Sumber:
XmlReader.cs
Sumber:
XmlReader.cs
Sumber:
XmlReader.cs
Sumber:
XmlReader.cs

Saat ditimpa di kelas turunan, mendapatkan nilai teks simpul saat ini.

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

Nilai Properti

String

Nilai yang dikembalikan tergantung pada NodeType simpul. Tabel berikut mencantumkan tipe simpul yang memiliki nilai untuk dikembalikan. Semua jenis node lainnya mengembalikan String.Empty.

Jenis node Nilai
Attribute Nilai dari atribut.
CDATA Konten bagian CDATA.
Comment Isi komentar.
DocumentType Subset internal.
ProcessingInstruction Seluruh konten, tidak termasuk target.
SignificantWhitespace Spasi kosong antara markup dalam model konten campuran.
Text Konten simpul teks.
Whitespace Spasi kosong di antara markup.
XmlDeclaration Isi deklarasi.

Pengecualian

InvalidOperationException

Metode XmlReader dipanggil sebelum operasi asinkron sebelumnya selesai. Dalam hal ini, InvalidOperationException dilemparkan dengan pesan "Operasi asinkron sudah berlangsung."

Contoh

Contoh berikut membaca file XML dan menampilkan setiap simpul.

XmlReaderSettings settings = new XmlReaderSettings();
settings.DtdProcessing = DtdProcessing.Parse;
XmlReader reader = XmlReader.Create("items.xml", settings);

reader.MoveToContent();
  // Parse the file and display each of the nodes.
  while (reader.Read()) {
    switch (reader.NodeType) {
      case XmlNodeType.Element:
          Console.Write("<{0}>", reader.Name);
          break;
      case XmlNodeType.Text:
          Console.Write(reader.Value);
          break;
       case XmlNodeType.CDATA:
           Console.Write("<![CDATA[{0}]]>", reader.Value);
           break;
       case XmlNodeType.ProcessingInstruction:
           Console.Write("<?{0} {1}?>", reader.Name, reader.Value);
           break;
       case XmlNodeType.Comment:
           Console.Write("<!--{0}-->", reader.Value);
           break;
       case XmlNodeType.XmlDeclaration:
           Console.Write("<?xml version='1.0'?>");
           break;
       case XmlNodeType.Document:
           break;
       case XmlNodeType.DocumentType:
           Console.Write("<!DOCTYPE {0} [{1}]", reader.Name, reader.Value);
           break;
       case XmlNodeType.EntityReference:
           Console.Write(reader.Name);
           break;
       case XmlNodeType.EndElement:
           Console.Write("</{0}>", reader.Name);
           break;
   }
}

/*
    The example displays the following output:

    <Item>Test with an entity: 123</Item><Item>Test with a child element <more> stuff</Item>
    <Item>Test with a CDATA section <![CDATA[<456>]]> def</Item><Item>Test with a char entity: A</Item>
    <!-- Fourteen chars in this element.--><Item>1234567890ABCD</Item></Items>
*/

Dim settings As New XmlReaderSettings()
settings.DtdProcessing = DtdProcessing.Parse
Dim reader As XmlReader = XmlReader.Create("items.xml", settings)
reader.MoveToContent()
' Parse the file and display each of the nodes.
While reader.Read()
  Select Case reader.NodeType
    Case XmlNodeType.Element
      Console.Write("<{0}>", reader.Name)
    Case XmlNodeType.Text
      Console.Write(reader.Value)
    Case XmlNodeType.CDATA
      Console.Write("<![CDATA[{0}]]>", reader.Value)
    Case XmlNodeType.ProcessingInstruction
      Console.Write("<?{0} {1}?>", reader.Name, reader.Value)
    Case XmlNodeType.Comment
      Console.Write("<!--{0}-->", reader.Value)
    Case XmlNodeType.XmlDeclaration
      Console.Write("<?xml version='1.0'?>")
    Case XmlNodeType.Document
    Case XmlNodeType.DocumentType
      Console.Write("<!DOCTYPE {0} [{1}]", reader.Name, reader.Value)
    Case XmlNodeType.EntityReference
      Console.Write(reader.Name)
    Case XmlNodeType.EndElement
      Console.Write("</{0}>", reader.Name)
  End Select
End While

' The example displays the following output:
'
' <Item>Test with an entity: 123</Item><Item>Test with a child element <more> stuff</Item>
' <Item>Test with a CDATA section <![CDATA[<456>]]> def</Item><Item>Test with a char entity: A</Item>
' <!-- Fourteen chars in this element.--><Item>1234567890ABCD</Item></Items>

Sampel menggunakan items.xml file .

<?xml version="1.0"?>
<!-- This is a sample XML document -->
<!DOCTYPE Items [<!ENTITY number "123">]>
<Items>
  <Item>Test with an entity: &number;</Item>
  <Item>Test with a child element <more/> stuff</Item>
  <Item>Test with a CDATA section <![CDATA[<456>]]> def</Item>
  <Item>Test with a char entity: A</Item>
  <!-- Fourteen chars in this element.-->
  <Item>1234567890ABCD</Item>
</Items>

Keterangan

Untuk versi asinkron properti ini, lihat GetValueAsync metode .

Berlaku untuk