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How do I sum data by month/YYYY in VB code in VS2010?

Posted on 2011-03-01
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Last Modified: 2012-05-11
Hello:

I would like to sum the total of several columns by each month based upon a user selected date range.  

This is what I have so far:

HERE I GRAB ALL THE DATES AVAILABLE IN THE DATE RANGE
----------------------------------------------------------------------------------
Dim dateList = From id In wellData.tblBWgallons _
                         Where id.InputDate >= CDate(pckrStartDate.Text) _
                         AndAlso id.InputDate <= CDate(pckrEndDate.Text) _
                         AndAlso id.Cumulative > 0 _
                         Order By id.InputDate Ascending _
                         Select id.InputDate

HERE I MAKE A LIST  BY M/YYYY
--------------------------------------------------------------
        Dim MonthList As New List(Of String)

        For Each m As Date In dateList
            Dim mon As String = CStr(m.Month)
            Dim YY As String = CStr(m.Year)
            Dim DateName As String = mon & "/" & YY

            If Not MonthList.Contains(DateName) Then
                MonthList.Add(DateName)
            Else
                'do nothing
            End If
        Next

PROBLEM AREA - I CAN'T FIGURE OUT HOW TO GRAB THE DATA BY THE LIST
-------------------------------------------------------------------------------------------------

        For Each rec In MonthList
            Dim mmyy As String = rec  (EXAMPLE mmyy would be 3/2010)

            Dim getRecords = Aggregate id In wellData.tblBWgallons _
                             Where CDate(id.InputDate.Value.ToString("m/yyyy")) = mmyy _
                             Into Sum(id.Cumulative)

        Next

Any help would be most appreciated!  
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Question by:Karen Wilson
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Accepted Solution

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Karen Wilson earned 0 total points
ID: 35008924
I got it...  Had to flip each record in the MonthList back to a date.

For Each rec In MonthList

            Dim mmyy As Date = rec
            Dim m As String = mmyy.Month
            Dim y As String = mmyy.Year


            Dim getRecords = Aggregate id In wellData.tblBWgallons _
                             Where CDate(id.InputDate.Value).Month = m _
                             And CDate(id.InputDate.Value).Year = y _
                             Into Sum(id.Cumulative)

        Next

0
 

Author Closing Comment

by:Karen Wilson
ID: 35008935
I figured it out myself....  after reading my own question!!
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