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how to maintain order in datagridview in vb.net

Posted on 2009-05-07
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Last Modified: 2012-05-06
Hi
I have a simple datagridview that is cleared with

DGV1.Rows.Clear()

and then updated on a timer with

For Each LC As DataStore In Update.APV.Values
DGV1.Rows.Add(New String() {DGVID, DGVWhen, DGVToGo})
Next

This works fine but If the user has changed the cell order in the columns, this is altered when the update takes place, as the order reverts back to the original.  Also the datagridview reverts back to cell 1,1

Is there a way of maintaining the cell order and cell position required by the user as the update takes place?

Thanks
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Comment
Question by:PNRT
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13 Comments
 
LVL 15

Expert Comment

by:JackOfPH
ID: 24332476
I always used this method, to in sure that even the user change the order of the column, the code still inserting on the right cell.

'So instead of this...

For Each LC As DataStore In Update.APV.Values
    DGV1.Rows.Add(New String() {DGVID, DGVWhen, DGVToGo})
Next

I use:

For Each LC As DataStore In Update.APV.Values
Dim rowIndex as integer = DGV1.Rows.Add

DGV1(colDGVID.index, rowindex).value = DGVID
DGV1(colDGVWhen.index, rowindex).value = DGVWhen
DGV1(colDGVToGo.index, rowindex).value = DGVToGo

Next

Although this is longer compared to the code you are using right now, I am sure that even the user change the order of the column, the code still inserting on the right cell.

I hope I could help you,

Jack
'Suggested code:
 
For Each LC As DataStore In Update.APV.Values
Dim rowIndex as integer = DGV1.Rows.Add
 
DGV1(colDGVID.index, rowindex).value = DGVID
DGV1(colDGVWhen.index, rowindex).value = DGVWhen
DGV1(colDGVToGo.index, rowindex).value = DGVToGo
 
Next

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Author Comment

by:PNRT
ID: 24333608
Thank you for your quick reply
I have tried the code as shown above, but it still does the same thing.   The column order still
reverts back to what it was before the user changed it, and also the highlighted row reverts
back to row 1.  This is the code I used.  I cant really see how this would maintain the order
required by the user.  Did I make my question clear that it is not incorrect cells that is the
problem, but keeping the same order of the cells in the column and also the
highlighted row kept in the same position and not moved back to row 1.  Many Thanks for
your help.

Private Sub UpdateDGV(ByVal DGVID As String, ByVal DGVWhen As String, ByVal DGVToGo As String)
        Dim rowIndex As Integer = DGV1.Rows.Add
        DGV1(Column1.Index, rowIndex).Value = DGVID
        DGV1(Column2.Index, rowIndex).Value = DGVWhen
        DGV1(Column3.Index, rowIndex).Value = DGVToGo
    End Sub
0
 
LVL 15

Expert Comment

by:JackOfPH
ID: 24333825
Does AllowColumnReorder is set to true?
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LVL 15

Expert Comment

by:JackOfPH
ID: 24333845
Did you set the datagridview property AllowColumnReorder = True?

Try also this code snippet...
Private Sub UpdateDGV(ByVal DGVID As String, ByVal DGVWhen As String, ByVal DGVToGo As String)
        Dim selectedRowIndex as integer = 0
        Dim rowIndex As Integer = DGV1.Rows.Add
        If DGV1.SelectedRows.Count <> 0 thne
              SelectedRowIndex = DGV1.SelectedRows(0).index
        End If
 
        DGV1(Column1.Index, rowIndex).Value = DGVID
        DGV1(Column2.Index, rowIndex).Value = DGVWhen
        DGV1(Column3.Index, rowIndex).Value = DGVToGo
 
        DGV1.Rows(SelectedRowIndex).Selected  = True
    End Sub

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Author Comment

by:PNRT
ID: 24334323
Thank you very much for replying so quickly, unfortuantely still the same problem.

Is the problem perhaps in the way I am clearing DGV1 in the first place ie
 DGV1.Rows.Clear()
Could that be the problem?

AllowUserToOrderColumns is set to True
This is the code so far

Private Sub UpdateDGV(ByVal DGVID As String, ByVal DGVWhen As String, ByVal DGVToGo As String)
        Dim selectedRowIndex As Integer = 0
        Dim rowIndex As Integer = DGV1.Rows.Add
        If DGV1.SelectedRows.Count <> 0 Then
            selectedRowIndex = DGV1.SelectedRows(0).Index
        End If
        DGV1(Column1.Index, rowIndex).Value = DGVID
        DGV1(Column2.Index, rowIndex).Value = DGVWhen
        DGV1(Column3.Index, rowIndex).Value = DGVToGo
        DGV1.Rows(selectedRowIndex).Selected = True
End Sub
0
 
LVL 15

Expert Comment

by:JackOfPH
ID: 24334340
Put this code after you clear the contents of the Datagridview.

  Dim selectedRowIndex As Integer = 0
        If DGV1.SelectedRows.Count <> 0 Then
            selectedRowIndex = DGV1.SelectedRows(0).Index
  End If


Then put this after you update all the contents of the datagridview...


DGV1.Rows(selectedRowIndex).Selected = True
0
 
LVL 2

Author Comment

by:PNRT
ID: 24334588
Still the same unfortunately.

Just to experiment,  I started a new project just with a timer and a Datagridview, the code is below.
This has the same problem.  Ist column goes back to original order and highlighted row moves to 1

Imports System.Data.OleDb

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

        Timer1.Interval = 5000
        DGV1.Rows.Clear()
        Dim selectedRowIndex As Integer = 0
        If DGV1.SelectedRows.Count <> 0 Then
            selectedRowIndex = DGV1.SelectedRows(0).Index
        End If

        Dim i As Integer
        For i = 1 To 20

            dgvid = i
            dgvwhen = ""
            dgvtogo = ""
           
            DGV1.AllowUserToOrderColumns = True
            Dim rowIndex As Integer = DGV1.Rows.Add
            If DGV1.SelectedRows.Count <> 0 Then
                selectedRowIndex = DGV1.SelectedRows(0).Index
            End If
            DGV1(Column1.Index, rowIndex).Value = dgvid
            DGV1(Column2.Index, rowIndex).Value = dgvwhen
            DGV1(Column3.Index, rowIndex).Value = dgvtogo
            DGV1.Rows(selectedRowIndex).Selected = True
        Next
    End Sub
0
 
LVL 15

Expert Comment

by:JackOfPH
ID: 24341471
Try this one...
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
 
        Timer1.Interval = 5000
 
Dim selectedRowIndex As Integer = 0
        If DGV1.SelectedRows.Count <> 0 Then
            selectedRowIndex = DGV1.SelectedRows(0).Index
        End If
        DGV1.Rows.Clear()
        
 
        Dim i As Integer
        For i = 1 To 20
 
            dgvid = i
            dgvwhen = ""
            dgvtogo = ""
           
            DGV1.AllowUserToOrderColumns = True
            Dim rowIndex As Integer = DGV1.Rows.Add
            If DGV1.SelectedRows.Count <> 0 Then
                selectedRowIndex = DGV1.SelectedRows(0).Index
            End If
            DGV1(Column1.Index, rowIndex).Value = dgvid
            DGV1(Column2.Index, rowIndex).Value = dgvwhen
            DGV1(Column3.Index, rowIndex).Value = dgvtogo
            
        Next
DGV1.Rows(selectedRowIndex).Selected = True
    End Sub

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LVL 2

Author Comment

by:PNRT
ID: 24343596
Hi again
Sorry but still the same thing.
Are we understanding the same problem in this question?
With the program at present, column 1 is populated  1 to 20.  
When I click on the column header the order changes to 20 to 1.  
When I click on say cell 5, that cell becomes highlighted.  
This is all corect.  
However, when the next update takes place, the order reverts back to 1 to 20 and the highlighted
cell becomes 1 again.  
Im trying to get it so that the column order remailns the same and the highlighted cell and position remain the same.

Is that OK?

Many Thanks
0
 
LVL 3

Expert Comment

by:Kevin Robinson
ID: 24358933
"Is there a way of maintaining the cell order and cell position required by the user as the update takes place?"

Yes of course.  I am working on this at the minute and is not as hard as i sounds.  My code is not quite finished but you could set a property of my control to a user setting of your application. This would alllow you user to select the columns they want to see, the width and the positions of the columns This would be loaded back every time the app is started.
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LVL 2

Author Comment

by:PNRT
ID: 24472617

I didnt hear back from anyone as yet?   Perhaps this is not possible?

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LVL 3

Accepted Solution

by:
Kevin Robinson earned 250 total points
ID: 24472701

I am using a custom collection to hold the info about the columns.  There is a datagrid view column collection but certain properties are readonly (for good reason), I just found it easier to make my own.  You can create a setting in your applcaiton for each of your  datagrids.  This means that each user can setup each the grisds the way they want.
 
 
Public Class Kevs_Column
 
#Region "Properties"
    Private M_ColumnName As String = ""
    Public Property ColumnName() As String
        Get
            Return Me.M_ColumnName
        End Get
        Set(ByVal value As String)
            Me.M_ColumnName = value
        End Set
    End Property
 
    Private M_ColumnWidth As Integer = 0
    Public Property ColumnWidth() As Integer
        Get
            Return Me.M_ColumnWidth
        End Get
        Set(ByVal value As Integer)
            Me.M_ColumnWidth = value
        End Set
    End Property
 
    Private M_ColumnPosition As Integer = 0
    Public Property ColumnPosition() As Integer
        Get
            Return Me.M_ColumnPosition
        End Get
        Set(ByVal value As Integer)
            Me.M_ColumnPosition = value
        End Set
    End Property
 
    Private M_Visible As Boolean = True
    Public Property Visible() As Boolean
        Get
            Return Me.M_Visible
        End Get
        Set(ByVal value As Boolean)
            Me.M_Visible = value
        End Set
    End Property
#End Region
 
#Region "Constructors"
    Public Sub New(ByVal ColumnName As String, ByVal ColumnPosition As Integer, ByVal ColumnWidth As Integer, ByVal Visible As Boolean)
        Me.M_ColumnName = ColumnName
        Me.M_ColumnPosition = ColumnPosition
        Me.M_ColumnWidth = ColumnWidth
        Me.Visible = Visible
    End Sub
#End Region
 
End Class
 
Public Class Kevs_ColumnCollection
    Private M_Columns As New List(Of Kevs_Column)
    Public Property Columns() As List(Of Kevs_Column)
        Get
            Return Me.M_Columns
        End Get
        Set(ByVal value As List(Of Kevs_Column))
            Me.M_Columns = value
        End Set
    End Property
 
    Public ReadOnly Property Count() As Integer
        Get
            Return Me.M_Columns.Count
        End Get
    End Property
 
 
    Public Sub Add(ByVal Column As Kevs_Column)
        Me.M_Columns.Add(Column)
    End Sub
 
    Public Sub Add(ByVal ColumnName As String, ByVal ColumnPosition As Integer, ByVal ColumnWidth As Integer, ByVal Visible As Boolean)
        Dim col As New Kevs_Column(ColumnName, ColumnPosition, ColumnWidth, Visible)
        Me.M_Columns.Add(col)
    End Sub
 
 
    Public Sub Clear()
        Me.Columns.Clear()
    End Sub
 
End Class
 
 
 
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Create a new custom control and inherit the datagrid view then add the following code.
 
 
 Private cols As New Kevs_ColumnCollection
 
    Public Sub SaveColumns(Setting as As New Kevs_ColumnCollection)
        Dim ColumnCount As Integer = 0
        ColumnCount = Me.dg_Contacts.ColumnCount
 
        For i As Integer = 0 To ColumnCount - 1
            cols.Clear()
            cols.Add(Me.dg_Contacts.Columns(i).Name, Me.dg_Contacts.Columns(i).Index, Me.dg_Contacts.Columns(i).Width, Me.dg_Contacts.Columns(i).Visible)
        Next
 
        Try
               My.Settings(Setting) = cols
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
 
    End Sub
 
    Public Sub RestoreColumns(Setting as String)
        Try
            Dim Restorecols As New Kevs_ColumnCollection
                    Restorecols = My.Settings(Setting)
                    Restorecols = CType(Restorecols, Kevs_ColumnCollection)
                    If Restorecols.Count <> 0 Then
                        For i As Integer = 0 To cols.Count - 1
                            Me.dg_Contacts.MoveColumn(cols.Columns(i).ColumnName, cols.Columns(i).ColumnPosition)
                            Me.dg_Contacts.SetColumnWidth(cols.Columns(i).ColumnName, cols.Columns(i).ColumnWidth)
                            Me.dg_Contacts.Columns(i).Visible = Restorecols.Columns(i).Visible
                        Next
                    End If
          Catch ex As Exception
            MsgBox(ex.Message)
        End Try
    End Sub

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Expert Comment

by:Kevin Robinson
ID: 24480989
Did that work ok for you?
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