XmlTextWriter.WriteQualifiedName(String, String) Metode

Definisi

Ruang nama:

System.Xml

Rakitan:

netstandard.dll, System.Xml.ReaderWriter.dll

Sumber:

XmlTextWriter.cs

Menulis nama yang memenuhi syarat namespace layanan. Metode ini mencari awalan yang berada dalam cakupan untuk namespace yang diberikan.

public:
 override void WriteQualifiedName(System::String ^ localName, System::String ^ ns);

public override void WriteQualifiedName(string localName, string? ns);

override this.WriteQualifiedName : string * string -> unit

Public Overrides Sub WriteQualifiedName (localName As String, ns As String)

Parameter

localName

String

Nama lokal untuk ditulis.

ns

String

URI namespace untuk dikaitkan dengan nama.

Pengecualian

ArgumentException

localName adalah baik null maupun String.Empty.

localName bukan nama yang valid sesuai dengan spesifikasi Namespace W3C.

Contoh

Contoh berikut menulis sebagian skema XSD.

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

public class Sample
{
  private const string filename = "sampledata.xml";

  public static void Main()
  {
     XmlTextWriter writer = null;

     writer = new XmlTextWriter (filename, null);
     // Use indenting for readability.
     writer.Formatting = Formatting.Indented;

     // Write the root element.
     writer.WriteStartElement("schema");

     // Write the namespace declarations.
     writer.WriteAttributeString("xmlns", null,"http://www.w3.org/2001/XMLSchema");
     writer.WriteAttributeString("xmlns","po",null,"http://contoso.com/po");

     writer.WriteStartElement("element");

     writer.WriteAttributeString("name", "purchaseOrder");

     // Write the type attribute.
     writer.WriteStartAttribute(null,"type", null);
     writer.WriteQualifiedName("PurchaseOrder", "http://contoso.com/po");
     writer.WriteEndAttribute();

     writer.WriteEndElement();

     // Write the close tag for the root element.
     writer.WriteEndElement();

     // Write the XML to file and close the writer.
     writer.Flush();
     writer.Close();

     // Read the file back in and parse to ensure well formed XML.
     XmlDocument doc = new XmlDocument();
     // Preserve white space for readability.
     doc.PreserveWhitespace = true;
     // Load the file.
     doc.Load(filename);

     // Write the XML content to the console.
     Console.Write(doc.InnerXml);
  }
}

Option Explicit
Option Strict

Imports System.IO
Imports System.Xml

Public Class Sample
    Private Shared filename As String = "sampledata.xml"
    Public Shared Sub Main()
        Dim writer As XmlTextWriter = Nothing
        
        writer = New XmlTextWriter(filename, Nothing)
        ' Use indenting for readability.
        writer.Formatting = Formatting.Indented
        
        ' Write the root element.
        writer.WriteStartElement("schema")
        
        ' Write the namespace declarations.
        writer.WriteAttributeString("xmlns", Nothing, "http://www.w3.org/2001/XMLSchema")
        writer.WriteAttributeString("xmlns", "po", Nothing, "http://contoso.com/po")
        
        writer.WriteStartElement("element")
        
        writer.WriteAttributeString("name", "purchaseOrder")
        
        ' Write the type attribute.
        writer.WriteStartAttribute(Nothing, "type", Nothing)
        writer.WriteQualifiedName("PurchaseOrder", "http://contoso.com/po")
        writer.WriteEndAttribute()
        
        writer.WriteEndElement()
        
        ' Write the close tag for the root element.
        writer.WriteEndElement()
        
        ' Write the XML to file and close the writer.
        writer.Flush()
        writer.Close()
        
        ' Read the file back in and parse to ensure well formed XML.
        Dim doc As New XmlDocument()
        ' Preserve white space for readability.
        doc.PreserveWhitespace = True
        ' Load the file.
        doc.Load(filename)
        
        ' Write the XML content to the console.
        Console.Write(doc.InnerXml)
    End Sub
End Class

Keterangan

Nota

Kami menyarankan agar Anda membuat XmlWriter instans dengan menggunakan XmlWriter.Create metode dan XmlWriterSettings kelas untuk memanfaatkan fungsionalitas baru.

Misalnya, kode Microsoft Visual C# berikut:

writer.Formatting = Formatting.Indented;
writer.WriteStartElement("root");
 writer.WriteAttributeString("xmlns","x",null,"urn:abc");
 writer.WriteStartElement("item");
 writer.WriteStartAttribute("href",null);
 writer.WriteString("#");
 writer.WriteQualifiedName("test","urn:abc");
 writer.WriteEndAttribute();
 writer.WriteEndElement();
 writer.WriteEndElement();
 writer.Close();

Menghasilkan output berikut:

<root xmlns:x="urn:abc">
 <item href="#x:test"/>
 </root>

Jika ns memetakan ke namespace default saat ini, tidak ada awalan yang dihasilkan.

Saat menulis nilai atribut, metode ini menghasilkan awalan jika ns tidak ditemukan. Saat menulis konten elemen, ia melemparkan pengecualian jika ns tidak ditemukan.

Jika penulis ini mendukung namespace layanan (Namespaces diatur ke true), metode ini juga memeriksa apakah nama tersebut valid sesuai dengan Namespace W3C dalam rekomendasi XML.