LinqToXml; query where attribute does not exist

Question

Is there syntax to state where attribute does not exist?

    Dim xe As XElement = _
    <xml>
        <el att1="ABC" att2="XYZ"/>
        <el att1="ABC"/>
        <el/>
    </xml>

    Dim xe2 As IEnumerable(Of XElement)
    xe2 = From c In xe.<el> Where c.@att1 = "ABC" And DoesNotExist(c.@att2)

    'Return: <el att1="ABC"/>

score 1 · Accepted Answer · answered Oct 12 '11 at 13:11

1

xe2 = From c In xe.<el> Where c.@att1 = "ABC" And c.@att2 Is Nothing

answered Oct 12 '11 at 13:11

NoAlias

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score 1 · Answer 2 · answered Oct 12 '11 at 13:14

1

Try String.IsNullOrEmpty(c.@att2).

answered Oct 12 '11 at 13:14

tom redfern

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Thanks, this works, but gave the correct answer to NoAlias as it feels closer to implementation. – baileyswalk Oct 12 '11 at 14:25

LinqToXml; query where attribute does not exist

2 Answers2