XmlReader.HasValue Property

Definition

Namespace:

System.Xml

Assembly:

System.Xml.ReaderWriter.dll

Source:

XmlReader.cs

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 virtual bool HasValue { get; }

member this.HasValue : bool

Public Overridable 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.