[RESOLVED] [2005] KeyDown - KeyPress - Delete Cell Value

[DroopyPawn]

When the delete key is pressed, I want to set the value of the current cell's text to "".

I tried this in the KeyDown and KeyPress events. Neither worked. (I expected it to work for any key, not just Delete.) It does nothing visible.

Private Sub grdG1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles grdG1.KeyPress
        Dim grd As DataGridView = DirectCast(sender, DataGridView)
        grd.CurrentCell.Value = ""
    End Sub

By the way, is Nothing the same as ""? Or could the first one cause Null error when the 2nd doesn't?

[jmcilhinney]

Nothing is not the same as an empty string, but in many circumstances they have the same effect. If a string is a piece of paper then an empty string is an empty piece of paper while Nothing is no paper at all. Regardless, if you want to specify an empty string you should use the String.Empty property.

[DroopyPawn]

Ok that's cleared up now. But what about setting the grid's cell.value to String.Empty when the Delete Key is pressed?

[jmcilhinney]

The Delete key doesn't raise a KeyPress event, as many keys do not. You say you tried the keyDown event but this just worked fine for me:

Private Sub DataGridView1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles DataGridView1.KeyDown
    If e.KeyCode = Keys.Delete Then
        Me.DataGridView1.CurrentCell.Value = String.Empty
    End If
End Sub

[DroopyPawn]

I tried identical code in my app just now. I know my Delete key works but not in this code.

Private Sub grdG1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles grdG1.KeyDown
        If e.KeyCode = Keys.Delete Then
            grdG1.CurrentCell.Value = String.Empty
        End If
    End Sub

[jmcilhinney]

What type of data is in the cell? Is it a string or some other type? If it's some other type then setting its value to an empty string wouldn't make sense.

[DroopyPawn]

Yep. It's a string.

[jmcilhinney]

Is your cell in edit mode? If so then the grid probably isn't raising any KeyDown event because it's the editing control that does.

[DroopyPawn]

I'm not editing the cell, just pressing Delete when I enter the cell. The Grid's EditMode is set to EditOnKeystrokeOrF2.

I tried this code in the KeyDown even and it didn't bring up anything.

EditOnKeystrokeOrF2

[DroopyPawn]

I must have had an error somewhere else. It's working now after I edited some other stuff.

[DroopyPawn]

How would I then fire the CellEndEdit from the KeyDown even? The sender paramaters would be the same but the 2nd paramaters are different.