XmlReader.HasValue Property

Reference

Definition

Namespace:: System.Xml

Assemblies:: System.Xml.dll, System.Xml.ReaderWriter.dll

Assemblies:: netstandard.dll, System.Xml.ReaderWriter.dll

Assembly:: System.Xml.ReaderWriter.dll

Assembly:: System.Xml.dll

Assembly:: netstandard.dll

Source:: XmlReader.cs

Source:: XmlReader.cs

Source:: XmlReader.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

When overridden in a derived class, gets a value indicating whether the current node can have a Value.

public:
 virtual property bool HasValue { bool get(); };

public:
 abstract property bool HasValue { bool get(); };

public virtual bool HasValue { get; }

public abstract bool HasValue { get; }

member this.HasValue : bool

Public Overridable ReadOnly Property HasValue As Boolean

Public MustOverride ReadOnly Property HasValue As Boolean

Property Value

Boolean

true if the node on which the reader is currently positioned can have a Value; otherwise, false. If false, the node has a value of String.Empty.

Exceptions

InvalidOperationException

An XmlReader method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

Examples

See HasValue (in the XmlTextReader class) for a sample using this method.

Remarks

The following table lists node types that have a value to return.

Node Type	Value
`Attribute`	The value of the attribute.
`CDATA`	The content of the CDATA section.
`Comment`	The content of the comment.
`DocumentType`	The internal subset.
`ProcessingInstruction`	The entire content, excluding the target.
`SignificantWhitespace`	The white space between markup in a mixed content model.
`Text`	The content of the text node.
`Whitespace`	The white space between markup.
`XmlDeclaration`	The content of the declaration.

Applies to

Product	Versions
.NET	Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1
UWP	10.0

Share via