• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 365
  • Last Modified:

Lists and DataGridView

I'm trying to use a DataGridView to display the contents of a list.

When I run the program the DataGridView is blank - so I'm doing something wrong.
My understanding (or misunderstanding) was that I could bind a list to a datagridview and that would be all there was to it.  For example:

Dim Inventory As New Collections.Generic.List(Of itemstochange)
'Loaded Inventory in the next few lines, left out to keep the question shorter
'I've looped through Inventory and it does fill correctly
'Inventory has three properties, sku, description & price

Dim source As New BindingSource
source.DataSource = Inventory

DataGridView1.DataSource = source

Open in new window

Do I have to loop through each item in the list to add it to the DataGridView?  I thought (hoped) that "binding" would pretty much take care of all of that for me.

I'm new to Lists and DataGridViews,  so please excuse this question if it's really simple.  :)

Thanks for your help!
  • 3
  • 2
1 Solution
Shaun KlineLead Software EngineerCommented:
Have you set up your columns to use those properties?
slightlyoffAuthor Commented:
No, I suppose that's the problem.  Is that done programmatically or on the design side?
Thanks for the quick reply!
Shaun KlineLead Software EngineerCommented:
That may not necessarily be the problem. It just happened to be a DUH moment for me a few days back. You should consider using a BindingList instead of a BindingSource.

This blog provides an example of both: http://blogs.msdn.com/b/dchandnani/archive/2005/03/12/394438.aspx?Redirected=true
Train for your Pen Testing Engineer Certification

Enroll today in this bundle of courses to gain experience in the logistics of pen testing, Linux fundamentals, vulnerability assessments, detecting live systems, and more! This series, valued at $3,000, is free for Premium members, Team Accounts, and Qualified Experts.

slightlyoffAuthor Commented:
Thanks again for your quick reply.  I tried following the examples in the link you sent, although I'm using VB.NET not C#.  

Here's the majority of my code.  It's still blank when I run it:

       'Originally used Generic List
       'Dim Inventory As New Collections.Generic.List(Of itemstochange)
       'using BindingList instead of Generic List...
       Dim Inventory As New BindingList(Of itemstochange)

        'To add something to your list will be
        Dim t As Integer
        Dim theSku As String = ""
        Dim theDesc As String = ""
        Dim thePrice As Double = 0
        Dim f1 As Integer = 0
        ProgressBar1.Maximum = lastSku
        ProgressBar1.Value = x
        For t = x To lastSku

        'Grab Items from excel worksheet, put into BindingList    
            If Len(xlWorkSheet.Cells(t, y).value) > 0 Then
                theSku = xlWorkSheet.Cells(t, y).Value.ToString
                f1 = 1
            End If

            If Len(xlWorkSheet.Cells(t, (y + 1)).value) > 0 Then
                theDesc = xlWorkSheet.Cells(t, (y + 1)).Value.ToString
                f1 = 1
            End If

            If Len(xlWorkSheet.Cells(t, (y + 6)).value) > 0 Then
                thePrice = CDbl(xlWorkSheet.Cells(t, (y + 6)).Value.ToString)
                f1 = 1
            End If

            If f1 <> 1 Then
                'Add to Binding List
                Inventory.Add(New itemstochange(theSku, theDesc, thePrice))
                f1 = 0
            End If
            ProgressBar1.Value = t

        'Connect BindingSource to Binding list
        BindingSource1.DataSource = Inventory

        'Connect DataGridView to Binding Source
        DataGridView1.DataSource = BindingSource1

Open in new window

I set up BindingSource1 and DataGridView in the Form View (dragging them from the toolbox).  DataGridView1's datasource shows up as BindingSource1 in the Properties panel, so I might not need to do that last step - but I've tried it with and without and no luck.

Any ideas?
Jacques Bourgeois (James Burger)PresidentCommented:
The DataSource property requires an object based on a class that implements IList. List already implements IList, so there is no need to define a BindingSource for most situations. The following should suffice:

DataGridView1.DataSource = Inventory
slightlyoffAuthor Commented:
Thank you!  I think the fact I chose a BindingSource as my datasource when I dragged in the DatagridView threw me off.
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

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

  • 3
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now