XmlTextWriter.WriteQualifiedName(String, String) Methode

Referenz

Definition

Namespace:: System.Xml

Assembly:: System.Xml.ReaderWriter.dll

Assembly:: System.Xml.dll

Assembly:: netstandard.dll

Wichtig

Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.

Schreibt den durch den Namespace angegebenen Namen. Diese Methode sucht das Präfix im Gültigkeitsbereich des Namespaces.

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

public override void WriteQualifiedName (string localName, 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

Der zu schreibende lokale Name.

ns: String

Der Namespace-URI, der dem Namen zugeordnet werden soll.

Ausnahmen

ArgumentException

localName ist entweder null oder String.Empty.

localName ist kein entsprechend der W3C-Spezifikation für Namespaces gültiger Name.

Beispiele

Im folgenden Beispiel wird ein Teil eines XSD-Schemas geschrieben.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   XmlTextWriter^ writer = nullptr;
   String^ filename = "sampledata.xml";
   writer = gcnew XmlTextWriter( filename, nullptr );
   
   // Use indenting for readability.
   writer->Formatting = Formatting::Indented;
   
   // Write the root element.
   writer->WriteStartElement( "schema" );
   
   // Write the namespace declarations.
   writer->WriteAttributeString( "xmlns", nullptr, "http://www.w3.org/2001/XMLSchema" );
   writer->WriteAttributeString( "xmlns", "po", nullptr, "http://contoso.com/po" );
   writer->WriteStartElement( "element" );
   writer->WriteAttributeString( "name", "purchaseOrder" );
   
   // Write the type attribute.
   writer->WriteStartAttribute( nullptr, "type", nullptr );
   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 = gcnew 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 );
}

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

Hinweise

Hinweis

Ab dem .NET Framework 2.0 empfehlen wir, Instanzen mithilfe der Methode und der XmlWriter.Create XmlWriterSettings Klasse zu erstellenXmlWriter, um neue Funktionen zu nutzen.

Beispiel: Der folgende Microsoft Visual C#-Code:

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();

Generiert folgende Ausgabe:

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

Wenn ns der aktuelle Standardnamespace zugeordnet ist, wird kein Präfix generiert.

Beim Schreiben von Attributwerten generiert diese Methode ein Präfix, wenn ns nicht gefunden wird. Beim Schreiben von Elementinhalten wird eine Ausnahme ausgelöst, wenn ns sie nicht gefunden wird.

Wenn dieser Writer Namespaces unterstützt (Namespaces ist auf true), überprüft diese Methode auch, dass der Name gemäß der W3C-Namespaces in XML-Empfehlung gültig ist.

Gilt für

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