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Datatable not populating correctly

Posted on 2010-08-31
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Last Modified: 2012-05-10
Hello,

Below is code I modified from code I had used to to create a graph. I have modified to work with other code that I developed to export a graph and it's underlying dataset to an excel dataset.  as part of my testing, I added a datagridview to the calling form in order to verify that I was getting the correct values.  After executing the code, I see, that the same I am getting duplicate values.  For example for two graph object, I am getting the same results.  I'm not sure what the problem is.
Private Function CreateGraphTable(ByVal intDatasetGroupId) As DataTable

        Dim graphs As New List(Of GraphReport)

        Dim dset As New DataSet("MyDataSet")

        Dim strTitleName As String = ""

        Dim strUnits As String = ""

        Dim dpl As New List(Of DatasetPair)

        Try

            dpl = DatasetPairDB.GetExportDatasetGroupDetail(intDatasetGroupId)

            Dim objgraph As New GraphReport

            For Each dp As DatasetPair In dpl



                objgraph.DataVersionIdOne = dp.DataVersionIdOne.ToString

                objgraph.DataVersionIdTwo = dp.DataVersionIdTwo.ToString

                objgraph.MetricName = dp.MetricName.ToString

                objgraph.GraphTitle = "TEST"

                graphs.Add(objgraph)

            Next



            For Each g As GraphReport In graphs



                If MatchingMetricUnits(g) = Nothing Then

                    MessageBox.Show(g.DataVersionIdOne.ToString & " and " & g.DataVersionIdTwo.ToString & " do not have corresponding units!", "Erro")

                    Return Nothing

                    Exit Function

                Else

                    strUnits = MatchingMetricUnits(g)

                    Units = strUnits

                End If



                Dim ds As New DataTable

                ds = ReportDB.GetDeltaSeriesData(g.DataVersionIdOne, g.DataVersionIdTwo, g.MetricName)



                Dim dtgv As New DataTable

                dtgv = ReportDB.GetDeltaReportData(g.DataVersionIdOne, g.DataVersionIdTwo, g.MetricName)



                If dtgv.Rows.Count < 1 Then

                    MessageBox.Show("No Data")

                    Return Nothing

                    Exit Function

                End If



                Dim newtable As New DataTable



                dset.Tables.Add(dtgv)

                For Each table As DataTable In dset.Tables

                    newtable.Merge(table)

                Next

                dgvGraphResults.DataSource = newtable

                Me.DgvTable = newtable



                Dim strSeriesName As String = g.DataVersionIdOne.ToString & " - " & g.DataVersionIdTwo.ToString

                MySeriesName = strSeriesName



                strTitleName = g.GraphTitle.ToString

                MyMetricName = g.GraphTitle.ToString



            Next

            Return DgvTable



        Catch ex As Exception

            MessageBox.Show(ex.Message.ToString & Err.Number.ToString)

            Return Nothing

        End Try



    End Function

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Question by:chtullu135
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2 Comments
 

Author Comment

by:chtullu135
ID: 33568560
Further troubleshooting revealed that the following loop is not populating objgraph properly
 dpl = DatasetPairDB.GetExportDatasetGroupDetail(intDatasetGroupId)
            Dim objgraph As New GraphReport
            For Each dp As DatasetPair In dpl

                objgraph.DataVersionIdOne = dp.DataVersionIdOne.ToString
                objgraph.DataVersionIdTwo = dp.DataVersionIdTwo.ToString
                objgraph.MetricName = dp.MetricName.ToString
                objgraph.GraphTitle = "TEST"
                graphs.Add(objgraph)
            Next
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Accepted Solution

by:
chtullu135 earned 0 total points
ID: 33568658
I found the problem.  It was pretty basic.  I needed to instantiate objgraph in the first line of the for loop instead of before the start of the for loop, otherwise it would be overwritten with the latest data
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