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Need help dynamically adding columns to a dataset's datatable, for export to xml

Posted on 2008-10-01
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Last Modified: 2008-10-01
I am pulling data from the company database.  The addresses are then geo-coded via the google geocoding service.
Since my dataset does not contain lat and long columns, i am trying to add them through code.  I am also removing rows where the LatLong could not be returned.

HOWEVER I find that the XML file does not contain the fields i have added. Please help!
Public Function DataSetToXML(ByVal oDS As DataSet) As DataSet
 
 
 
        '*Add columns to the datatable if they do not already exist
        If Not ColumnExists(oDS.Tables(0), "ProjectLat") Then
            'Doesnt exist, add the column
            oDS.Tables(0).Columns.Add(New Data.DataColumn("ProjectLat", Type.GetType("System.Decimal")))
            oDS.Tables(0).AcceptChanges()
        End If
 
        If Not ColumnExists(oDS.Tables(0), "ProjectLong") Then
            'Doesnt exist, add the column
            oDS.Tables(0).Columns.Add(New Data.DataColumn("ProjectLong", Type.GetType("System.Decimal")))
            oDS.Tables(0).AcceptChanges()
        End If
 
 
        'For Each orow As DataRow In oDS.Tables(0).Rows
        Dim i As Integer
        For i = oDS.Tables(0).Rows.Count - 1 To 0 Step -1
 
 
            Dim oitem As New GoogleSkunkWorksData.PCLSite
            Dim strPointCoOrd As String = ""
 
            With oitem
                .ProjectAddress1 = objDALHelper.NothingIfNull(oDS.Tables(0).Rows(i).Item("Address 1"))
                .ProjectAddress2 = objDALHelper.NothingIfNull(oDS.Tables(0).Rows(i).Item("Address 2"))
                .ProjectAddress3 = objDALHelper.NothingIfNull(oDS.Tables(0).Rows(i).Item("Address 3"))
                .ProjectCity = objDALHelper.NothingIfNull(oDS.Tables(0).Rows(i).Item("City"))
                .ProjectCountry = objDALHelper.NothingIfNull(oDS.Tables(0).Rows(i).Item("Country"))
                'Grab the geocoded address
                strPointCoOrd = GeoCode(oDS.Tables(0).Rows(i))
 
 
                Dim arrNewSplit As String() = Nothing
                arrNewSplit = strPointCoOrd.Split(",")
                Dim bSuccess As Boolean = True
                For Each s As String In arrNewSplit
                    If Not s <> "" Then
                        'Next iteration, the address cant be geo-coded!
                        'remove the row from the Dataset
                        oDS.Tables(0).Rows.RemoveAt(i)
                        oDS.Tables(0).AcceptChanges()
                        
                        bSuccess = False
                    Else
                        .ProjectLat = CDbl(arrNewSplit(0))
                        .ProjectLong = CDbl(arrNewSplit(1))
                    End If
                Next
 
              
            End With
        Next
        oDS.Tables(0).AcceptChanges()
        oDS.Tables(0).WriteXml(XMLDataPath, XmlWriteMode.IgnoreSchema)
        
        Return oDS

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Question by:peterdidow
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2 Comments
 
LVL 47

Accepted Solution

by:
Wayne Taylor (webtubbs) earned 500 total points
ID: 22619132
When writing a Dataset to XML, any columns which contain no data are ignored. When you are looping through the rows, you will need to add something (possibly an empty string) to the columns for them to be exported to the XML file.

Wayne
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Author Comment

by:peterdidow
ID: 22619410
Thanks webtubbs!

it turned out that I DID have null values....for ALL of the co-ords.
In case your curious, here is what I had:

For Each s As String In arrNewSplit
                    If Not s <> "" Then
                        'Next iteration, the address cant be geo-coded!
                        'remove the row from the Dataset
                        oDS.Tables(0).Rows.RemoveAt(i)
                        oDS.Tables(0).AcceptChanges()
                       
                        bSuccess = False
                    Else
                        .ProjectLat = CDbl(arrNewSplit(0))
                        .ProjectLong = CDbl(arrNewSplit(1))
                    End If
                Next
I CHANGED TO:
For Each s As String In arrNewSplit
                    If Not s <> "" Then
                        'Next iteration, the address cant be geo-coded!
                        'remove the row from the Dataset
                        oDS.Tables(0).Rows.RemoveAt(i)
                        oDS.Tables(0).AcceptChanges()
                       
                        bSuccess = False
                    Else

                        oDS.Tables(0).Rows(i).Item("ProjectLat") = CType(arrNewSplit(0), Double)
                        .ProjectLat = objDALHelper.NothingIfNull(oDS.Tables(0).Rows(i).Item("ProjectLat"))

                        oDS.Tables(0).Rows(i).Item("ProjectLong") = CType(arrNewSplit(1), Double)
                        .ProjectLong = CType(arrNewSplit(1), Double)

                    End If
                Next

So thanks, i found the solution shortly after your comment!
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