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Thread: Distinct Values in XML with .Net

  1. #1
    Join Date
    Jul 2004

    Distinct Values in XML with .Net


    I am developing an application on .Net and wish to use XML for drop down list. I do not want the drop down list to have repetitive data. For e.g If my drop down list has Countries and their States as L1 and L2 table respectively, I do not want L1 to repeat name of the country (e.g India) 30+ times as those many states of India get listed on L2.

    Sub fillLevel2(ByVal level1 As String, ByVal dd As DropDownList)
    Dim strXML As String = Server.MapPath("~") & "\xmlFiles\LOV.xml"
    Dim xdoc1 As New XPathDocument(strXML)
    Dim xNav1 As XPathNavigator = xdoc1.CreateNavigator()
    Dim xNodeIterator1 As XPathNodeIterator
    Dim xPathExpr1 As XPathExpression = xNav1.Compile("(//Table[LOVLevel1 ='" & level1 & "'])/LOVLevel2")
    xPathExpr1.AddSort(".", XmlSortOrder.Ascending, XmlCaseOrder.None, "", XmlDataType.Text)
    xNodeIterator1 = xNav1.Select(xPathExpr1)
    While xNodeIterator1.MoveNext()
    End While
    dd.Items.Insert(0, New ListItem("Select Level2", ""))
    End Sub

    Thanks in advance for the assistance

  2. #2
    Join Date
    May 2009
    United Kingdom
    I have not come across anything in .NET that will allow a distinct select nodes. You're already using the XPathNavigator for the sort, which the XmlNode.SelectNodes() does not provide.

    However, you could modify your XPath to prevent duplicates, I think that this would work for you:
    //Table[LOVLevel1 ='" & level1 & "']/LOVLevel2[not(.=preceding-sibling::LOVLevel2)]
    Alternatively, it would required a second pass of the dd.Items collection to remove the duplicates.

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