XmlWriter.WriteStartElement 方法

參考

定義

命名空間:: System.Xml

組件:: System.Xml.ReaderWriter.dll

組件:: System.Xml.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

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)

Source:: XmlWriter.cs

Source:: XmlWriter.cs

Source:: 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

InvalidOperationException

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。

EncoderFallbackException

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)

Source:: XmlWriter.cs

Source:: XmlWriter.cs

Source:: 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

InvalidOperationException

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。

EncoderFallbackException

備註

呼叫這個方法之後，您可以撰寫屬性，或使用、 WriteString 或 WriteStartElement 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)

Source:: XmlWriter.cs

Source:: XmlWriter.cs

Source:: 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

InvalidOperationException

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。

EncoderFallbackException

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

XmlWriter.WriteStartElement 方法

定義

多載

備註

WriteStartElement(String)

參數

例外狀況

範例

備註

適用於

WriteStartElement(String, String)

參數

例外狀況

備註

適用於

WriteStartElement(String, String, String)

參數

例外狀況

範例

備註

適用於

意見反應

其他資源