Solved

How to sort Object collection with more than one Property

Posted on 2008-10-16
5
713 Views
Last Modified: 2012-05-05
How to sort Object collection with more than one Property

currently I am able to sort by one property thats is shelflocation but how can I implement sorting like for Shelflocation, OrderID
Means first sort by Shelflocation then OrderID

I really appreciate any code examples

Thanks
'MY CLASS WHICH IS HANDLING SORTING

    Public Class PickListLineCollection

        Inherits CollectionBase
 

        Public Function Add(ByVal NewPickListLine As PickListLine) As Integer
 

            ' If the customer doesn't already exist, add it.        

            Return InnerList.Add(NewPickListLine)

        End Function
 

#Region "Sorting the collection"
 

        Public Sub Sort(ByVal propertyName As String)
 

            If propertyName.ToUpper() = "SHELFLOCATION" Then

                ' Using Pick List Comparer to sort by Shelf Location 

                Dim Comparer As New PickListCompare

                InnerList.Sort(Comparer)

            End If

        End Sub
 

#End Region
 

    End Class
 

#Region "Code to Sort the collection"

    ' This class provides mechanism for comparing SiteRating property

    Public Class PickListCompare

        Implements IComparer
 

        Function Compare(ByVal x As Object, ByVal y As Object) As Integer _

                            Implements IComparer.Compare
 

            Dim PickListLineY As PickListLine

            Dim PickListLineX As PickListLine
 

            ' Converting generic input objects to the objects of Product class

            PickListLineX = CType(x, PickListLine)

            PickListLineY = CType(y, PickListLine)
 

            ' Comparing SiteRating property and returing comparison result

            Return String.Compare(PickListLineX.ShelfLocation, PickListLineY.ShelfLocation)
 

        End Function
 

    End Class
 
 
 
 

'OBJECT WHICH NEED SORTING

Public Class PickListLine
 

        Private m_strShelfLocation As String

        Private m_lngOrderID As Long

        Private m_strCustomer As String

        Private m_strProductName As String
 

        Public Sub New(ByVal ShelfLocation As String, _

                       ByVal OrderID As Long, _

                       ByVal Customer As String, _

                       ByVal ProductName As String, _

                       )
 

            m_strShelfLocation = ShelfLocation

            m_lngOrderID = OrderID

            m_strCustomer = Customer

            m_strProductName = ProductName
 

        End Sub
 

        Public ReadOnly Property ShelfLocation() As String

            Get

                Return m_strShelfLocation

            End Get

        End Property
 
 

        Public ReadOnly Property OrderID() As Long

            Get

                Return m_lngOrderID

            End Get

        End Property
 

        Public ReadOnly Property CustomerName() As String

            Get

                Return m_strCustomer

            End Get

        End Property
 
 

        Public ReadOnly Property ProductName() As String

            Get

                Return m_strProductName

            End Get

        End Property
 

    End Class

Open in new window

0
Comment
Question by:shieldguy
  • 3
  • 2
5 Comments
 
LVL 85

Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 22733594
In your Compare() method, store the result of the first comparsion in a local variable.  If they are equal then do the second comparison and return that instead:

        Function Compare(ByVal x As Object, ByVal y As Object) As Integer _
                            Implements IComparer.Compare
 
            Dim PickListLineY As PickListLine
            Dim PickListLineX As PickListLine
 
            ' Converting generic input objects to the objects of Product class
            PickListLineX = CType(x, PickListLine)
            PickListLineY = CType(y, PickListLine)
 
            ' Comparing SiteRating property and returing comparison result
            Dim result As Integer = PickListLineX.ShelfLocation.CompareTo(PickListLineY.ShelfLocation)
            If result = 0 Then
                result = PickListLineX.OrderID.CompareTo(PickListLineY.OrderID)
            End If
            Return result
        End Function
0
 
LVL 3

Expert Comment

by:JunkMan
ID: 22736097
That was exactly one of the reasons i upgraded most of my projects to 3.5...

Linq is a beauty :)
0
 
LVL 85

Expert Comment

by:Mike Tomlinson
ID: 22736145
@JunkMan,

Yeah, I'm sure Linq can handle it quite nicely in short code that is easy to read and understand.

I'd love to play with it...can you buy me a new laptop so I can get cracking?...  =)
0
 
LVL 3

Expert Comment

by:JunkMan
ID: 22736297
@Idle_Mind,

I'm sure a new laptop wouldn't be required just for an upgrade to vs08! In any case here you go, it looks pretty new to me!..
17laptop-l.jpg
0
 
LVL 85

Expert Comment

by:Mike Tomlinson
ID: 22736404
Thanx!  Unfortunately my replicator is down...maybe I can whip one of those up tomorrow...  ;)
Replicator.jpg
0

Featured Post

How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

Join & Write a Comment

Just a quick little trick I learned recently.  Now that I'm using jQuery with abandon in my asp.net applications, I have grown tired of the following syntax:      (CODE) I suppose it just offends my sense of decency to put inline VBScript on a…
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
Access reports are powerful and flexible. Learn how to create a query and then a grouped report using the wizard. Modify the report design after the wizard is done to make it look better. There will be another video to explain how to put the final p…
You have products, that come in variants and want to set different prices for them? Watch this micro tutorial that describes how to configure prices for Magento super attributes. Assigning simple products to configurable: We assigned simple products…

762 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

Need Help in Real-Time?

Connect with top rated Experts

24 Experts available now in Live!

Get 1:1 Help Now