Changing back color of ALL web controls on a form.

[Wokawidget]

In VB6 I would do something like:

	Private Sub DoColors()
		Dim FormControl As Control
		For Each FormControl In Me.Controls
			CType(FormControl, WebControl).BackColor = (New Color).FromArgb(RGB(CType(Rnd() * 255, Integer), CType(Rnd() * 255, Integer), CType(Rnd() * 255, Integer)))
		Next
	End Sub

But this doesn't work.
It errors on:

CType(FormControl, WebControl).BackColor

Saying it's an invalid typecast

Woka

[Magiaus]

Try Casting to the GetType() and then doing a test for the Property.

If CType(o,o.GetType()).BackColor Then
    CType(o,o.GetType()).BackColor = System.Drawing.Color.White
End If

I haven't tried that, but it should work. The problem is the collection is of type Control and doesn't have to be of type WebControl.

[Wokawidget]

o.GetType not defined

Woka

[Magiaus]

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim i As Int32 = 0
        Dim ctl As System.Web.UI.Control
 
        While (i < Page.Controls.Count)
            ctl = Page.Controls(i)
            SetBackColor(ctl, System.Drawing.Color.Green)
            i += 1
        End While
    End Sub
 
    Public Sub SetBackColor(ByRef ctl As System.Web.UI.Control, ByVal c As System.Drawing.Color)
        Try
            ctl.GetType().GetProperty("BackColor").SetValue(ctl, c, Nothing)
        Catch
            'beep
        End Try
        If ctl.Controls.Count > 0 Then
            Dim i As Int32 = 0
            While (i < ctl.Controls.Count)
                SetBackColor(ctl.Controls(i), c)
                i += 1
            End While
        End If
    End Sub

tested/works (skips the page it's self but if you start from the page it will get everything)

[Magiaus]

Just a tip too. Your not suposed to be able to use For Each to modify a value on an object just read. Thus why use it.....