Parses the attribute value into one or more Text, EntityReference, or EndEntity nodes.
Namespace:
System.Xml
Assembly:
System.Xml (in System.Xml.dll)
Visual Basic (Declaration)
Public Overrides Function ReadAttributeValue As Boolean
Dim instance As XmlTextReader
Dim returnValue As Boolean
returnValue = instance.ReadAttributeValue()
public override bool ReadAttributeValue()
public:
virtual bool ReadAttributeValue() override
public override function ReadAttributeValue() : boolean
Return Value
Type:
System..::.Boolean
true if there are nodes to return.
false if the reader is not positioned on an attribute node when the initial call is made or if all the attribute values have been read.
An empty attribute, such as, misc="", returns true with a single node with a value of String.Empty.
Note: |
|---|
In the .NET Framework version 2.0 release, the recommended practice is to create XmlReader instances using the XmlReader..::.Create method. This allows you to take full advantage of the new features introduced in this release. For more information, see Creating XML Readers. |
Use this method after calling MoveToAttribute to read through the text or entity reference nodes that make up the attribute value. The Depth of the attribute value nodes is one plus the depth of the attribute node; it increments and decrements by one when you step into and out of general entity references.
The following example reads an attribute with text and entity nodes.
Imports System
Imports System.IO
Imports System.Xml
public class Sample
public shared sub Main()
Dim reader as XmlTextReader = nothing
try
'Create the XML fragment to be parsed.
Dim xmlFrag as string ="<book genre='novel' misc='sale-item &h; 1987'></book>"
'Create the XmlParserContext.
Dim context as XmlParserContext
Dim subset as string = "<!ENTITY h 'hardcover'>"
context = new XmlParserContext(nothing, nothing, "book", nothing, nothing, subset, "", "", XmlSpace.None)
'Create the reader.
reader = new XmlTextReader(xmlFrag, XmlNodeType.Element, context)
'Read the misc attribute. The attribute is parsed
'into multiple text and entity reference nodes.
reader.MoveToContent()
reader.MoveToAttribute("misc")
while (reader.ReadAttributeValue())
if (reader.NodeType = XmlNodeType.EntityReference)
Console.WriteLine("{0} {1}", reader.NodeType, reader.Name)
else
Console.WriteLine("{0} {1}", reader.NodeType, reader.Value)
end if
end while
finally
if Not reader Is Nothing
reader.Close()
End if
end try
end sub
end class
using System;
using System.IO;
using System.Xml;
public class Sample
{
public static void Main()
{
XmlTextReader reader = null;
try
{
//Create the XML fragment to be parsed.
string xmlFrag ="<book genre='novel' misc='sale-item &h; 1987'></book>";
//Create the XmlParserContext.
XmlParserContext context;
string subset = "<!ENTITY h 'hardcover'>";
context = new XmlParserContext(null, null, "book", null, null, subset, "", "", XmlSpace.None);
//Create the reader.
reader = new XmlTextReader(xmlFrag, XmlNodeType.Element, context);
//Read the misc attribute. The attribute is parsed
//into multiple text and entity reference nodes.
reader.MoveToContent();
reader.MoveToAttribute("misc");
while (reader.ReadAttributeValue()){
if (reader.NodeType==XmlNodeType.EntityReference)
Console.WriteLine("{0} {1}", reader.NodeType, reader.Name);
else
Console.WriteLine("{0} {1}", reader.NodeType, reader.Value);
}
}
finally
{
if (reader != null)
reader.Close();
}
}
} // End class
#using <System.Xml.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
XmlTextReader^ reader = nullptr;
__try
{
// Create the XML fragment to be parsed.
String^ xmlFrag = "<book genre='novel' misc='sale-item &h; 1987'></book>";
// Create the XmlParserContext.
XmlParserContext^ context;
String^ subset = "<!ENTITY h 'hardcover'>";
context = gcnew XmlParserContext( nullptr,nullptr,"book",nullptr,nullptr,subset,"","",XmlSpace::None );
// Create the reader.
reader = gcnew XmlTextReader( xmlFrag,XmlNodeType::Element,context );
// Read the misc attribute. The attribute is parsed
// into multiple text and entity reference nodes.
reader->MoveToContent();
reader->MoveToAttribute( "misc" );
while ( reader->ReadAttributeValue() )
{
if ( reader->NodeType == XmlNodeType::EntityReference )
Console::WriteLine( " {0} {1}", reader->NodeType, reader->Name );
else
Console::WriteLine( " {0} {1}", reader->NodeType, reader->Value );
}
}
__finally
{
if ( reader != nullptr )
reader->Close();
}
}
#using <mscorlib.dll>
#using <System.Xml.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
XmlTextReader* reader = 0;
__try
{
// Create the XML fragment to be parsed.
String* xmlFrag =S"<book genre='novel' misc='sale-item &h; 1987'></book>";
// Create the XmlParserContext.
XmlParserContext * context;
String* subset = S"<!ENTITY h 'hardcover'>";
context = new XmlParserContext(0, 0, S"book", 0, 0, subset, S"", S"", XmlSpace::None);
// Create the reader.
reader = new XmlTextReader(xmlFrag, XmlNodeType::Element, context);
// Read the misc attribute. The attribute is parsed
// into multiple text and entity reference nodes.
reader -> MoveToContent();
reader -> MoveToAttribute(S"misc");
while (reader -> ReadAttributeValue())
{
if (reader -> NodeType == XmlNodeType::EntityReference)
Console::WriteLine(S" {0} {1}", __box(reader -> NodeType), reader -> Name);
else
Console::WriteLine(S" {0} {1}", __box(reader -> NodeType), reader -> Value);
}
}
__finally
{
if (reader != 0)
reader -> Close();
}
}
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
.NET Compact Framework
Supported in: 3.5, 2.0, 1.0
XNA Framework
Supported in: 3.0, 2.0, 1.0
Reference
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