Article
11/17/2011

IXmlLineInfo.HasLineInfo Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Gets a value indicating whether the class can return line information.

Namespace: System.Xml
Assembly: System.Xml (in System.Xml.dll)

Syntax

'Declaration
Function HasLineInfo As Boolean

bool HasLineInfo()

Return Value

Type: System.Boolean
true if LineNumber and LinePosition can be provided; otherwise, false.

Examples

' Create the XML fragment to be parsed.
Dim xmlFrag As String = _
    "<book>" & _
         "<misc>" & _
             "<style>paperback</style>" & _
             "<pages>240</pages>" & _
         "</misc>" & _
     "</book>"

' Create the XmlNamespaceManager.
Dim nsmgr As XmlNamespaceManager = New XmlNamespaceManager(New NameTable())

' Create the XmlParserContext.
Dim context As New XmlParserContext(Nothing, nsmgr, Nothing, XmlSpace.None)

Dim output As New StringBuilder()
' Create the reader.
Using reader As XmlReader = XmlReader.Create(New StringReader(xmlFrag), Nothing, context)

    Dim lineInfo As IXmlLineInfo = CType(reader, IXmlLineInfo)
    If lineInfo.HasLineInfo() Then

        ' Parse the XML and display each node.
        While reader.Read()
            Select Case reader.NodeType
                Case XmlNodeType.Element
                    output.Append(reader.Depth.ToString() + " " + _
                        lineInfo.LineNumber.ToString() + ", " + _
                        lineInfo.LinePosition.ToString())
                    output.AppendLine("<" + reader.Name + ">")
                Case XmlNodeType.Text
                    output.Append(reader.Depth.ToString() + " " + _
                        lineInfo.LineNumber.ToString() + ", " + _
                        lineInfo.LinePosition.ToString())
                    output.AppendLine("  " + reader.Value)
                Case XmlNodeType.EndElement
                    output.Append(reader.Depth.ToString() + " " + _
                        lineInfo.LineNumber.ToString() + ", " + _
                        lineInfo.LinePosition.ToString())
                    output.AppendLine("</" + reader.Name + ">")
            End Select
        End While
    End If
End Using

' Display the output to the TextBlock control
OutputTextBlock.Text = output.ToString()

// Create the XML fragment to be parsed.
string xmlFrag =
    @"<book>
             <misc>
                 <style>paperback</style>
                 <pages>240</pages>
             </misc>
         </book>";

// Create the XmlNamespaceManager.
XmlNamespaceManager nsmgr = new XmlNamespaceManager(new NameTable());

// Create the XmlParserContext.
XmlParserContext context = new XmlParserContext(null, nsmgr, null, XmlSpace.None);

StringBuilder output = new StringBuilder();

// Create the reader.
using (XmlReader reader = XmlReader.Create(new StringReader(xmlFrag), null, context))
{

    IXmlLineInfo lineInfo = ((IXmlLineInfo)reader);
    if (lineInfo.HasLineInfo())
    {

        // Parse the XML and display each node.
        while (reader.Read())
        {
            switch (reader.NodeType)
            {
                case XmlNodeType.Element:
                    output.Append(reader.Depth + " " +
                        lineInfo.LineNumber + ", " +
                        lineInfo.LinePosition);
                    output.AppendLine("<" + reader.Name + ">");
                    break;
                case XmlNodeType.Text:
                    output.Append(reader.Depth + " " +
                        lineInfo.LineNumber + ", " +
                        lineInfo.LinePosition);
                    output.AppendLine("  " + reader.Value);
                    break;
                case XmlNodeType.EndElement:
                    output.Append(reader.Depth + " " +
                        lineInfo.LineNumber + ", " +
                        lineInfo.LinePosition);
                    output.AppendLine("</" + reader.Name + ">");
                    break;
            }
        }
    }

    // Close the reader.
}

// Display the output to the TextBlock control
OutputTextBlock.Text = output.ToString();

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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