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XmlWriter.WriteStartElement 方法

定義

在衍生類別中覆寫時,寫入指定的開頭標記。

多載

WriteStartElement(String)

在衍生類別中覆寫時,寫出具有指定之區域名稱的開頭標記。

WriteStartElement(String, String)

在衍生類別中覆寫時,寫入指定的開頭標記並與指定的命名空間產生關聯。

WriteStartElement(String, String, String)

在衍生類別中覆寫時,寫入指定的開頭標記,並與指定的命名空間與前置詞產生關聯。

備註

如需這個方法的非同步版本,請參閱 WriteStartElementAsync

WriteStartElement(String)

來源:
XmlWriter.cs
來源:
XmlWriter.cs
來源:
XmlWriter.cs

在衍生類別中覆寫時,寫出具有指定之區域名稱的開頭標記。

public:
 void WriteStartElement(System::String ^ localName);
public void WriteStartElement (string localName);
member this.WriteStartElement : string -> unit
Public Sub WriteStartElement (localName As String)

參數

localName
String

項目的本機名稱。

例外狀況

寫入器已關閉。

-或-

在先前的非同步作業完成前呼叫了 XmlWriter 方法。 在此情況下,會擲回 InvalidOperationException 與「非同步作業已經在進行中」的訊息。

緩衝區中有一個字元,其為有效的 XML 字元,但對輸出編碼而言無效。 比方說如果輸出的編碼方式為 ASCII,您應該在項目與屬性名稱中只使用範圍從 0 至 127 的字元。 無效的字元可能是在這個方法的引數中,或在先前已寫入至緩衝區的方法的引數中。 字元實體參考會盡可能逸出這類字元 (比方說在文字節點或屬性值中)。 不過,在項目與屬性名稱、註解、處理指示或 CDATA 區段中不允許字元實體參考。

範例

下列範例會寫入 XML 節點。

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   
   // Create a writer to write XML to the console.
   XmlWriterSettings^ settings = gcnew XmlWriterSettings;
   settings->Indent = true;
   settings->OmitXmlDeclaration = true;
   XmlWriter^ writer = XmlWriter::Create( Console::Out, settings );
   
   // Write the book element.
   writer->WriteStartElement( L"book" );
   
   // Write the title element.
   writer->WriteStartElement( L"title" );
   writer->WriteString( L"Pride And Prejudice" );
   writer->WriteEndElement();
   
   // Write the close tag for the root element.
   writer->WriteEndElement();
   
   // Write the XML and close the writer.
   writer->Close();
   return 1;
}
using System;
using System.IO;
using System.Xml;

public class Sample {

  public static void Main() {

     // Create a writer to write XML to the console.
     XmlWriterSettings settings = new XmlWriterSettings();
     settings.Indent = true;
     settings.OmitXmlDeclaration = true;
     XmlWriter writer = XmlWriter.Create(Console.Out, settings);

     // Write the book element.
     writer.WriteStartElement("book");

     // Write the title element.
     writer.WriteStartElement("title");
     writer.WriteString("Pride And Prejudice");
     writer.WriteEndElement();

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

     // Write the XML and close the writer.
     writer.Close();
  }
}
Option Explicit
Option Strict

Imports System.IO
Imports System.Xml

Public Class Sample
    
  Public Shared Sub Main()

     ' Create a writer to write XML to the console.
     Dim settings As XmlWriterSettings = new XmlWriterSettings()
     settings.Indent = true
     settings.OmitXmlDeclaration = true
     Dim writer As XmlWriter = XmlWriter.Create(Console.Out, settings)

     ' Write the book element.
     writer.WriteStartElement("book")
        
     ' Write the title element.
     writer.WriteStartElement("title")
     writer.WriteString("Pride And Prejudice")
     writer.WriteEndElement()
        
     ' Write the close tag for the root element.
     writer.WriteEndElement()
        
     ' Write the XML and close the writer.
     writer.Close()

  End Sub
End Class

備註

如需這個方法的非同步版本,請參閱 WriteStartElementAsync

適用於

WriteStartElement(String, String)

來源:
XmlWriter.cs
來源:
XmlWriter.cs
來源:
XmlWriter.cs

在衍生類別中覆寫時,寫入指定的開頭標記並與指定的命名空間產生關聯。

public:
 void WriteStartElement(System::String ^ localName, System::String ^ ns);
public void WriteStartElement (string localName, string ns);
public void WriteStartElement (string localName, string? ns);
member this.WriteStartElement : string * string -> unit
Public Sub WriteStartElement (localName As String, ns As String)

參數

localName
String

項目的本機名稱。

ns
String

與項目相關聯的命名空間 URI。 如果這個命名空間已經在範圍中並具有相關聯的前置詞,則寫入器也會自動寫入前置詞。

例外狀況

寫入器已關閉。

-或-

在先前的非同步作業完成前呼叫了 XmlWriter 方法。 在此情況下,會擲回 InvalidOperationException 與「非同步作業已經在進行中」的訊息。

緩衝區中有一個字元,其為有效的 XML 字元,但對輸出編碼而言無效。 比方說如果輸出的編碼方式為 ASCII,您應該在項目與屬性名稱中只使用範圍從 0 至 127 的字元。 無效的字元可能是在這個方法的引數中,或在先前已寫入至緩衝區的方法的引數中。 字元實體參考會盡可能逸出這類字元 (比方說在文字節點或屬性值中)。 不過,在項目與屬性名稱、註解、處理指示或 CDATA 區段中不允許字元實體參考。

備註

呼叫這個方法之後,您可以撰寫屬性,或使用 、 WriteStringWriteStartElement 針對子專案建立內容 WriteComment 。 您可以使用 或 WriteFullEndElement 來關閉 專案 WriteEndElement 。 例如,下列 C# 程式碼:

writer.WriteStartElement("item",null);
writer.WriteString("some text");
writer.WriteEndElement();

它會產生下列輸出:

<item>some text</item>

如需這個方法的非同步版本,請參閱 WriteStartElementAsync

適用於

WriteStartElement(String, String, String)

來源:
XmlWriter.cs
來源:
XmlWriter.cs
來源:
XmlWriter.cs

在衍生類別中覆寫時,寫入指定的開頭標記,並與指定的命名空間與前置詞產生關聯。

public:
 abstract void WriteStartElement(System::String ^ prefix, System::String ^ localName, System::String ^ ns);
public abstract void WriteStartElement (string prefix, string localName, string ns);
public abstract void WriteStartElement (string? prefix, string localName, string? ns);
abstract member WriteStartElement : string * string * string -> unit
Public MustOverride Sub WriteStartElement (prefix As String, localName As String, ns As String)

參數

prefix
String

項目的命名空間前置詞。

localName
String

項目的本機名稱。

ns
String

與項目相關聯的命名空間 URI。

例外狀況

寫入器已關閉。

-或-

在先前的非同步作業完成前呼叫了 XmlWriter 方法。 在此情況下,會擲回 InvalidOperationException 與「非同步作業已經在進行中」的訊息。

緩衝區中有一個字元,其為有效的 XML 字元,但對輸出編碼而言無效。 比方說如果輸出的編碼方式為 ASCII,您應該在項目與屬性名稱中只使用範圍從 0 至 127 的字元。 無效的字元可能是在這個方法的引數中,或在先前已寫入至緩衝區的方法的引數中。 字元實體參考會盡可能逸出這類字元 (比方說在文字節點或屬性值中)。 不過,在項目與屬性名稱、註解、處理指示或 CDATA 區段中不允許字元實體參考。

範例

下列範例會寫出 XML 片段。

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
public ref class Sample
{
private:
   static String^ m_Document = L"sampledata.xml";

public:
   static void Main()
   {
      XmlWriter^ writer = nullptr;
      try
      {
         XmlWriterSettings^ settings = gcnew XmlWriterSettings;
         settings->Indent = true;
         writer = XmlWriter::Create( m_Document,settings );
         writer->WriteComment( L"sample XML fragment" );
         
         // Write an element (this one is the root).
         writer->WriteStartElement( L"book" );
         
         // Write the namespace declaration.
         writer->WriteAttributeString( L"xmlns", L"bk", nullptr, L"urn:samples" );
         
         // Write the genre attribute.
         writer->WriteAttributeString( L"genre", L"novel" );
         
         // Write the title.
         writer->WriteStartElement( L"title" );
         writer->WriteString( L"The Handmaid's Tale" );
         writer->WriteEndElement();
         
         // Write the price.
         writer->WriteElementString( L"price", L"19.95" );
         
         // Lookup the prefix and write the ISBN element.
         String^ prefix = writer->LookupPrefix( L"urn:samples" );
         writer->WriteStartElement( prefix, L"ISBN", L"urn:samples" );
         writer->WriteString( L"1-861003-78" );
         writer->WriteEndElement();
         
         // Write the style element (shows a different way to handle prefixes).
         writer->WriteElementString( L"style", L"urn:samples", L"hardcover" );
         
         // Write the close tag for the root element.
         writer->WriteEndElement();
         
         // Write the XML to file and close the writer.
         writer->Flush();
         writer->Close();
      }
      finally
      {
         if ( writer != nullptr )
                  writer->Close();
      }

   }

};

void main()
{
   Sample::Main();
}
using System;
using System.IO;
using System.Xml;

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

   public static void Main() {

      XmlWriter writer = null;

      try {

        XmlWriterSettings settings = new XmlWriterSettings();
        settings.Indent = true;
        writer = XmlWriter.Create (m_Document, settings);

        writer.WriteComment("sample XML fragment");

        // Write an element (this one is the root).
        writer.WriteStartElement("book");

        // Write the namespace declaration.
        writer.WriteAttributeString("xmlns", "bk", null, "urn:samples");

        // Write the genre attribute.
        writer.WriteAttributeString("genre", "novel");

        // Write the title.
        writer.WriteStartElement("title");
        writer.WriteString("The Handmaid's Tale");
        writer.WriteEndElement();

        // Write the price.
        writer.WriteElementString("price", "19.95");

        // Lookup the prefix and write the ISBN element.
        string prefix = writer.LookupPrefix("urn:samples");
        writer.WriteStartElement(prefix, "ISBN", "urn:samples");
        writer.WriteString("1-861003-78");
        writer.WriteEndElement();

        // Write the style element (shows a different way to handle prefixes).
        writer.WriteElementString("style", "urn:samples", "hardcover");

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

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

      finally {
        if (writer != null)
           writer.Close();
     }
   }
 }
Option Strict
Option Explicit

Imports System.IO
Imports System.Xml

Public Class Sample
    Private Shared m_Document As String = "sampledata.xml"
    
    Public Shared Sub Main()
        Dim writer As XmlWriter = Nothing
        
      Try

        Dim settings As XmlWriterSettings = new XmlWriterSettings()
        settings.Indent = true
        writer = XmlWriter.Create (m_Document, settings)
            
        writer.WriteComment("sample XML fragment")
            
        ' Write an element (this one is the root).
        writer.WriteStartElement("book")
            
        ' Write the namespace declaration.
        writer.WriteAttributeString("xmlns", "bk", Nothing, "urn:samples")
            
        ' Write the genre attribute.
        writer.WriteAttributeString("genre", "novel")
            
        ' Write the title.
        writer.WriteStartElement("title")
        writer.WriteString("The Handmaid's Tale")
        writer.WriteEndElement()
            
        ' Write the price.
        writer.WriteElementString("price", "19.95")
            
        ' Lookup the prefix and write the ISBN element.
        Dim prefix As String = writer.LookupPrefix("urn:samples")
        writer.WriteStartElement(prefix, "ISBN", "urn:samples")
        writer.WriteString("1-861003-78")
        writer.WriteEndElement()
            
        ' Write the style element (shows a different way to handle prefixes).
        writer.WriteElementString("style", "urn:samples", "hardcover")
            
        ' Write the close tag for the root element.
        writer.WriteEndElement()
            
        ' Write the XML to file and close the writer.
        writer.Flush()
        writer.Close()
        
        Finally
            If Not (writer Is Nothing) Then
                writer.Close()
            End If
        End Try

    End Sub
End Class

備註

如需這個方法的非同步版本,請參閱 WriteStartElementAsync

適用於