DataGridViewButtonColumn

[Keyth]

Hi.

I have a DataGridView that I add the columns to at runtime.

The datasource has a boolean type column and I want to be able to change the button text according to the boolean value.

For example:

If the boolean value is true then the button text should be "Unallocate" but if the boolean value is false, the button text should be "Allocate"

Dim btnColumn As New DataGridViewButtonColumn
btnColumn.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter
btnColumn.UseColumnTextForButtonValue = True
btnColumn.HeaderText = "Allocate"
btnColumn.Width = 75
btnColumn.Name = "Allocate"
btnColumn.DataPropertyName = "Allocate"
btnColumn.Visible = True
btnColumn.ReadOnly = False
.Columns.Add(btnColumn)

Does anybody know how I can change the value when the datagridviewcheckboxcolumn value changes from true to false and visa-versa?

Thanks for any help you can offer

 

[earthandfire]

This seems to do what you need:


A crude (no error checking) pretend strongly typed collection

Public Class Class1

	Private FBool As Boolean

	Public Property Bool() As Boolean
		Get
			Return FBool
		End Get
		Set(ByVal value As Boolean)
			FBool = value
		End Set
	End Property

	Public ReadOnly Property BoolText() As String
		Get
			Return IIf(FBool, "Unallocate", "Allocate").ToString
		End Get
	End Property

End Class


Public Class Class1Collection
	Inherits System.Collections.CollectionBase

	Public Sub Add(ByVal item As Class1)

		List.Add(item)

	End Sub

	Public Function Item(ByVal index As Integer) As Class1

		Return CType(List(index), Class1)

	End Function
End Class

Populate the collection and set up and populate the datagridview

	Private c1coll As New Class1Collection

	Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click

		For a As Integer = 1 To 10
			Dim c1 As New Class1
			c1.Bool = a Mod 2 = 0
			c1coll.Add(c1)
		Next

		With DataGridView2
			.Columns.Add(New DataGridViewButtonColumn)
			.Columns(0).HeaderText = "Button"
			.Columns.Add(New DataGridViewCheckBoxColumn)
			.Columns(1).HeaderText = "CheckBox"
			For Each c1 As Class1 In c1coll
				.Rows.Add(c1.BoolText, c1.Bool)
			Next
		End With

	End Sub

Handle the "check-changed" event on the datagridview checkbox column via the "backdoor"

	Private Sub DataGridView2_CellContentClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView2.CellContentClick

		If e.ColumnIndex = 1 Then
			Dim c1 As Class1 = c1coll.Item(e.RowIndex)
			c1.Bool = Not c1.Bool
			DataGridView2.Rows(e.RowIndex).Cells(0).Value = c1.BoolText
		End If

	End Sub

Not what I would call the most professional of solutions but at 0100 on a Sunday morning that's the best you're going to get - and it works!!

Hope this helps.

 

[Keyth]

Thanks for your help with this EarthAndFire... I will give it a go and see what happens in my app.

Hope you got a good nights sleep after that!

Keyth

 

[Keyth]

Hi again.

I tried what EarchAndFire has suggested and it may work well toggling boolean values on unbound data, but I cannot see how it would work when the button column is not bound to data but the remaining columns are. It would have helped if I had explained this in the first place! Thanks anyway EarthAndFire.

Within the same row, if the button currently reads "Allocate", the user can click it and change a boolean value on the same row, at this point when the boolean value changes to True, I would like the button text to become "Un-Allocate"

Any more ideas anybody?

Many thanks.