DataGridView with CheckBox at Header

Question

Hello,

How to add a Check Box in the header of a check box column? I need to add a check box in the header.

Answer 1

You cannot add a checkbox in a Row Header, 

Please describe next time more exact that you want,  now I see what you want. 

It is simply not possible for that you need 3rd party grids or use WPF (I assume the WPF datagrid will also not fit like, you have to design it completely yourself).

However, you can make of course the rowheader invisible and use the first column

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Success
Cor

Answer 2

Not supported by the DataGridView, but you can add one. I used the code from the below link:

http://www.brianpautsch.com/Blog/2006/10/10/DataGridView/

Private _selectAll As Boolean = False

'Fill your DataGridView then add the CheckBox column:

DataGridView1.Columns.Insert(0, New DataGridViewCheckBoxColumn())


    Private Sub DataGridView1_CellPainting(sender As Object, e As System.Windows.Forms.DataGridViewCellPaintingEventArgs) Handles DataGridView1.CellPainting

        'Is this the checkbox column header?
        If e.RowIndex = -1 AndAlso e.ColumnIndex = 0 Then
            Try
                'Erase the cell
                Using backColorBrush As Brush = New SolidBrush(e.CellStyle.BackColor)
                    e.Graphics.FillRectangle(backColorBrush, e.CellBounds)
                End Using

                'Draw 1 bottom line...
                e.Graphics.DrawLine(Pens.DarkGray, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right, e.CellBounds.Bottom - 1)
                'Draw 2 top lines...
                e.Graphics.DrawLine(Pens.DarkGray, e.CellBounds.Left, e.CellBounds.Top, e.CellBounds.Right, e.CellBounds.Top)
                e.Graphics.DrawLine(Pens.White, e.CellBounds.Left, e.CellBounds.Top + 1, e.CellBounds.Right, e.CellBounds.Top + 1)
                'Draw right line...
                e.Graphics.DrawLine(Pens.DarkGray, e.CellBounds.Right - 1, e.CellBounds.Top, e.CellBounds.Right - 1, e.CellBounds.Bottom)
                'Draw left line...
                e.Graphics.DrawLine(Pens.White, e.CellBounds.Left, e.CellBounds.Top, e.CellBounds.Left, e.CellBounds.Bottom)

                'Get the image from the resource file
                Dim imgChecked As Image = CType(Code_Examples.My.Resources.Resource1.checked, Image)
                Dim imgUnchecked As Image = CType(Code_Examples.My.Resources.Resource1.unchecked, Image)

                'Determine paint coordinates
                Dim X As Integer = e.CellBounds.Left + ((e.CellBounds.Width - imgChecked.Width) / 2) - 1
                Dim Y As Integer = e.CellBounds.Top + ((e.CellBounds.Height - imgChecked.Height) / 2) - 1

                'Draw checkbox in header
                If _selectAll Then
                    e.Graphics.DrawImage(imgChecked, X, Y)
                Else
                    e.Graphics.DrawImage(imgUnchecked, X, Y)
                End If

                'Set event as handled
                e.Handled = True
            Catch
                'Handle exception
            End Try
        End If
    End Sub

Private Sub DataGridView1_ColumnHeaderMouseClick(sender As Object, e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles DataGridView1.ColumnHeaderMouseClick

        If e.ColumnIndex = 0 Then
            _selectAll = Not _selectAll
            For i As Integer = 0 To DataGridView1.Rows.Count - 1
                DataGridView1.Rows(i).Cells(0).Value = _selectAll
            Next i
        End If

End Sub

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Paul ~~~~ Microsoft MVP (Visual Basic)

Answer 3

One good solution can be found here:

CheckBox in Header Cell of DataGridView Control

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Pradeep, Microsoft MVP (Visual Basic)
http://pradeep1210.wordpress.com