XmlWriter.WriteAttributeString 方法
定義
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,寫入具有指定值的屬性。
多載
WriteAttributeString(String, String, String, String) |
在衍生類別中覆寫時,寫出具有指定的前置詞、區域名稱、命名空間 URI 及其值的屬性。 |
WriteAttributeString(String, String, String) |
在衍生類別中覆寫時,寫入具有指定區域名稱、命名空間 URI 和值的屬性。 |
WriteAttributeString(String, String) |
在衍生類別中覆寫時,寫出具有指定的區域名稱與數值的屬性。 |
備註
如需這個方法的非同步版本,請參閱 WriteElementStringAsync 。
WriteAttributeString(String, String, String, String)
- 來源:
- XmlWriter.cs
- 來源:
- XmlWriter.cs
- 來源:
- XmlWriter.cs
在衍生類別中覆寫時,寫出具有指定的前置詞、區域名稱、命名空間 URI 及其值的屬性。
public:
void WriteAttributeString(System::String ^ prefix, System::String ^ localName, System::String ^ ns, System::String ^ value);
public void WriteAttributeString (string prefix, string localName, string ns, string value);
public void WriteAttributeString (string? prefix, string localName, string? ns, string? value);
member this.WriteAttributeString : string * string * string * string -> unit
Public Sub WriteAttributeString (prefix As String, localName As String, ns As String, value As String)
參數
- prefix
- String
屬性的命名空間前置詞。
- localName
- String
屬性的本機名稱。
- ns
- String
屬性的命名空間 URI。
- value
- String
屬性的值。
例外狀況
寫入器的狀態不是 WriteState.Element
,或寫入器已關閉。
-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。
xml:space
或 xml:lang
屬性值無效。
localName
或 ns
為 null
範例
下列範例會 WriteAttributeString 使用 方法來寫入命名空間宣告。
#using <System.Xml.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;
void main()
{
XmlWriter^ writer = nullptr;
writer = XmlWriter::Create( L"sampledata.xml" );
// Write the root element.
writer->WriteStartElement( L"book" );
// Write the xmlns:bk="urn:book" namespace declaration.
writer->WriteAttributeString( L"xmlns", L"bk", nullptr, L"urn:book" );
// Write the bk:ISBN="1-800-925" attribute.
writer->WriteAttributeString( L"ISBN", L"urn:book", L"1-800-925" );
writer->WriteElementString( L"price", L"19.95" );
// Write the close tag for the root element.
writer->WriteEndElement();
// Write the XML to file and close the writer.
writer->Flush();
writer->Close();
}
using System;
using System.IO;
using System.Xml;
public class Sample {
public static void Main() {
XmlWriter writer = null;
writer = XmlWriter.Create("sampledata.xml");
// Write the root element.
writer.WriteStartElement("book");
// Write the xmlns:bk="urn:book" namespace declaration.
writer.WriteAttributeString("xmlns","bk", null,"urn:book");
// Write the bk:ISBN="1-800-925" attribute.
writer.WriteAttributeString("ISBN", "urn:book", "1-800-925");
writer.WriteElementString("price", "19.95");
// Write the close tag for the root element.
writer.WriteEndElement();
// Write the XML to file and close the writer.
writer.Flush();
writer.Close();
}
}
Imports System.IO
Imports System.Xml
Public Class Sample
Public Shared Sub Main()
Dim writer As XmlWriter = Nothing
writer = XmlWriter.Create("sampledata.xml")
' Write the root element.
writer.WriteStartElement("book")
' Write the xmlns:bk="urn:book" namespace declaration.
writer.WriteAttributeString("xmlns","bk", Nothing,"urn:book")
' Write the bk:ISBN="1-800-925" attribute.
writer.WriteAttributeString("ISBN", "urn:book", "1-800-925")
writer.WriteElementString("price", "19.95")
' Write the close tag for the root element.
writer.WriteEndElement()
' Write the XML to file and close the writer.
writer.Flush()
writer.Close()
End Sub
End Class
備註
這個方法會寫出具有使用者定義命名空間前置詞的屬性,並將它與指定的命名空間產生關聯。 如果前置詞為 「xmlns」,則此方法也會將此視為命名空間宣告,並將宣告的前置詞與指定屬性值中提供的命名空間 URI 產生關聯。 在此情況下,自 ns
變數可以是 null
。
WriteAttributeString
會執行下列動作:
如果屬性值包含雙引號或單引號,則會分別取代為
"
和'
。如果寫入
xml:space
屬性,寫入器會驗證屬性值有效。 (有效值為preserve
或default
.)如果寫入
xml:lang
屬性,寫入器不會根據 W3C XML 1.0 建議來驗證屬性值是否有效。
如需這個方法的非同步版本,請參閱 WriteAttributeStringAsync 。
適用於
WriteAttributeString(String, String, String)
- 來源:
- XmlWriter.cs
- 來源:
- XmlWriter.cs
- 來源:
- XmlWriter.cs
在衍生類別中覆寫時,寫入具有指定區域名稱、命名空間 URI 和值的屬性。
public:
void WriteAttributeString(System::String ^ localName, System::String ^ ns, System::String ^ value);
public void WriteAttributeString (string localName, string ns, string value);
public void WriteAttributeString (string localName, string? ns, string? value);
member this.WriteAttributeString : string * string * string -> unit
Public Sub WriteAttributeString (localName As String, ns As String, value As String)
參數
- localName
- String
屬性的本機名稱。
- ns
- String
與屬性相關聯的命名空間 URI。
- value
- String
屬性的值。
例外狀況
寫入器的狀態不是 WriteState.Element
,或寫入器已關閉。
-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。
xml:space
或 xml:lang
屬性值無效。
範例
下列範例會 WriteAttributeString 使用 方法來寫入命名空間宣告。
#using <System.Xml.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;
void main()
{
XmlWriter^ writer = nullptr;
writer = XmlWriter::Create( L"sampledata.xml" );
// Write the root element.
writer->WriteStartElement( L"book" );
// Write the xmlns:bk="urn:book" namespace declaration.
writer->WriteAttributeString( L"xmlns", L"bk", nullptr, L"urn:book" );
// Write the bk:ISBN="1-800-925" attribute.
writer->WriteAttributeString( L"ISBN", L"urn:book", L"1-800-925" );
writer->WriteElementString( L"price", L"19.95" );
// Write the close tag for the root element.
writer->WriteEndElement();
// Write the XML to file and close the writer.
writer->Flush();
writer->Close();
}
using System;
using System.IO;
using System.Xml;
public class Sample {
public static void Main() {
XmlWriter writer = null;
writer = XmlWriter.Create("sampledata.xml");
// Write the root element.
writer.WriteStartElement("book");
// Write the xmlns:bk="urn:book" namespace declaration.
writer.WriteAttributeString("xmlns","bk", null,"urn:book");
// Write the bk:ISBN="1-800-925" attribute.
writer.WriteAttributeString("ISBN", "urn:book", "1-800-925");
writer.WriteElementString("price", "19.95");
// Write the close tag for the root element.
writer.WriteEndElement();
// Write the XML to file and close the writer.
writer.Flush();
writer.Close();
}
}
Imports System.IO
Imports System.Xml
Public Class Sample
Public Shared Sub Main()
Dim writer As XmlWriter = Nothing
writer = XmlWriter.Create("sampledata.xml")
' Write the root element.
writer.WriteStartElement("book")
' Write the xmlns:bk="urn:book" namespace declaration.
writer.WriteAttributeString("xmlns","bk", Nothing,"urn:book")
' Write the bk:ISBN="1-800-925" attribute.
writer.WriteAttributeString("ISBN", "urn:book", "1-800-925")
writer.WriteElementString("price", "19.95")
' Write the close tag for the root element.
writer.WriteEndElement()
' Write the XML to file and close the writer.
writer.Flush()
writer.Close()
End Sub
End Class
備註
這個方法會寫出具有使用者定義命名空間前置詞的屬性,並將它與指定的命名空間產生關聯。 如果 localName
為 「xmlns」,則這個方法也會將此視為命名空間宣告。 在此情況下,自 ns
變數可以是 null
。
WriteAttributeString
會執行下列動作:
如果屬性值包含雙引號或單引號,則會分別取代為
"
和'
。如果寫入
xml:space
屬性,寫入器會驗證屬性值有效。 (有效值為preserve
或default
.)如果寫入
xml:lang
屬性,寫入器不會根據 W3C XML 1.0 建議來驗證屬性值是否有效。
如需這個方法的非同步版本,請參閱 WriteAttributeStringAsync 。
適用於
WriteAttributeString(String, String)
- 來源:
- XmlWriter.cs
- 來源:
- XmlWriter.cs
- 來源:
- XmlWriter.cs
在衍生類別中覆寫時,寫出具有指定的區域名稱與數值的屬性。
public:
void WriteAttributeString(System::String ^ localName, System::String ^ value);
public void WriteAttributeString (string localName, string value);
public void WriteAttributeString (string localName, string? value);
member this.WriteAttributeString : string * string -> unit
Public Sub WriteAttributeString (localName As String, value As String)
參數
- localName
- String
屬性的本機名稱。
- value
- String
屬性的值。
例外狀況
寫入器的狀態不是 WriteState.Element
,或寫入器已關閉。
-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。
xml:space
或 xml:lang
屬性值無效。
範例
下列範例會寫出書籍。
#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
WriteAttributeString
會執行下列動作:
如果屬性值包含雙引號或單引號,則會分別取代為
"
和'
。如果寫入
xml:space
屬性,寫入器會驗證屬性值有效。 (有效值為preserve
或default
.)如果寫入
xml:lang
屬性,寫入器不會根據 W3C XML 1.0 建議來驗證屬性值是否有效。
如需這個方法的非同步版本,請參閱 WriteAttributeStringAsync 。