VB.NET Group and Sum Custom List(of T) LINQ

Posted on 2014-11-21
Medium Priority
Last Modified: 2016-02-16

i have a class 'CustomerSales' below and two lists...

Private _customerSalesList As List(Of CustomerSales)
Private _priorYearSalesList As List(Of PriorSales)

Public Class CustomerSales
    Implements IComparable(Of CustomerSales)
    Public Sub New(ByVal customerNumber As Int32,
                   ByVal groupCode As String,
                   ByVal mtdSales As Integer,
                   ByVal mtdBudget As Integer,
                   ByVal qtdSales As Integer,
                   ByVal qtdBudget As Integer,
                   ByVal ytdSales As Integer,
                   ByVal ytdBudget As Integer)
        Me.CustomerNumber = customerNumber
        Me.GroupCode = groupCode
        Me.MtdSales = mtdSales
        Me.MtdBudget = mtdBudget
        Me.QtdSales = qtdSales
        Me.QtdBudget = qtdBudget
        Me.YtdSales = ytdSales
        Me.YtdBudget = ytdBudget
    End Sub

    Public Property CustomerNumber As Int32
    Public Property GroupCode As String
    Public Property MtdSales As Int32
    Public Property MtdBudget As Int32
    Public Property QtdSales As Int32
    Public Property QtdBudget As Int32
    Public Property YtdSales As Int32
    Public Property YtdBudget As Int32

    Public Function CompareTo(ByVal other As CustomerSales) As Integer Implements IComparable(Of CustomerSales).CompareTo
        Return -YtdSales.CompareTo(other.YtdSales)
    End Function
End Class

Open in new window

Basically I need to group by GroupCode (discarding CustomerNumber of course) and Sum the rest of the fields.  Then I need to join another list on GroupCode and add the PriorMTD/QTD/YTDSales as properties to the new object.

Public Class PriorSales
    Public Sub New(ByVal organizationalCode As String, ByVal priorMtdSales As Integer, ByVal priorQtdSales As Integer, ByVal priorYtdSales As Integer)
        Me.GroupCode = organizationalCode
        Me.PriorMtdSales = priorMtdSales
        Me.PriorQtdSales = priorQtdSales
        Me.PriorYtdSales = priorYtdSales
    End Sub

    Public Property GroupCode As String
    Public Property PriorMtdSales As Int32
    Public Property PriorQtdSales As Int32
    Public Property PriorYtdSales As Int32
End Class

Open in new window

Question by:FamousMortimer
  • 2
LVL 75

Accepted Solution

käµfm³d   👽 earned 2000 total points
ID: 40458125
I always forget the exact syntax for grouping in VB.NET, but I believe it should be along the lines of:

Dim query = From customerSale In customerSalesCollection
            Group customerSale By customerSale.GroupCode Into Group
            Join priorSale In priorSalesCollection On GroupCode Equals priorSale.GroupCode
            Select New With
                .MtdSalesTotal = Group.Sum(Function (item) item.MtdSales),
                .MtdBudgetTotal = Group.Sum(Function (item) item.MtdBudget),
                .QtdSalesTotal = Group.Sum(Function (item) item.QtdSales),
                .QtdBudgetTotal = Group.Sum(Function (item) item.QtdBudget),
                .YtdSalesTotal = Group.Sum(Function (item) item.YtdSales),
                .YtdBudgetTotal = Group.Sum(Function (item) item.YtdBudget),
                .PriorMtdSales = priorSale.PriorMtdSales,
                .PriorQtdSales = priorSale.PriorQtdSales,
                .PriorYtdSales = priorSale.PriorYtdSales

Open in new window

** edited to correct a few bugs
LVL 64

Expert Comment

by:Fernando Soto
ID: 40458274
Hi FamousMortimer;

See if this is what you are looking for.

Dim custSalesList = (From cl As CustomerSales In _customerSalesList
                     Group By Code = cl.GroupCode Into clGroup = Group
                     Select New PriorSales(
                         priorMtdSales:=clGroup.Sum(Function(mtd) mtd.MtdSales),
                         priorQtdSales:=clGroup.Sum(Function(qtd) qtd.QtdSales),
                         priorYtdSales:=clGroup.Sum(Function(ytd) ytd.YtdSales)

''  priorYearList contains those values that have the same GroupCode in both list with the new values for them
Dim priorYearList = (From pl As PriorSales In _priorYearSalesList
                     Join code In custSalesList On pl.GroupCode Equals code.GroupCode
                     Select New PriorSales(
                         priorMtdSales:=pl.PriorMtdSales + code.PriorMtdSales,
                         priorQtdSales:=pl.PriorQtdSales + code.PriorQtdSales,
                         priorYtdSales:=pl.PriorYtdSales + code.PriorYtdSales

Open in new window

LVL 10

Author Closing Comment

ID: 40458284
Brilliant sir.
LVL 10

Author Comment

ID: 40458291
Sorry Fernando... i didn't get a chance to see your comment until after i verified that kaufmed's worked for me and assigned the points.

Featured Post

Upgrade your Question Security!

Your question, your audience. Choose who sees your identity—and your question—with question security.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
Hello there! As a developer I have modified and refactored the unit tests which was written by fellow developers in the past. On the course, I have gone through various misconceptions and technical challenges when it comes to implementation. I would…
This video tutorial shows you the steps to go through to set up what I believe to be the best email app on the android platform to read Exchange mail.  Get the app on your phone: The first step is to make sure you have the Samsung Email app on your …
Did you know PowerShell can save you time with SaaS platforms? Simply leverage RESTfulAPIs to build your own PowerShell modules. These will kill repetitive tickets and tabs, using the command Invoke-RestMethod. Tune into this webinar to learn how…

619 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question