Unable to cast object of type 'item here' to type 'item here'

Question

When I do something like:

For Each item As HScrollBar In Me.Controls 'ERROR: Unable to cast object of type 'System.Windows.Forms.TextBox' to type 'System.Windows.Forms.HScrollBar'.
item.Visible = False
Next

I get an error because I have a control on a windows forms that is not the item which is a hscrollbar.

Did you expect a different result? Which result did you expect? — John Saunders, Nov 16 '13 at 17:21
Read this http://stackoverflow.com/questions/253937/recursive-control-search-with-linq — Uzair Khan, Nov 16 '13 at 17:31

score 2 · Accepted Answer · answered Nov 16 '13 at 17:24

Yeah, that's not correct code. Me.Controls contains controls, not just scrollbars. Fix:

    For Each item As Control In Me.Controls
        If TypeOf item Is HScrollBar Then
            '' etc..
        End If
    Next

Or the cleaner Linq version:

    For Each item As HScrollBar In Me.Controls.OfType(Of HScrollBar)()
        '' etc..
    Next

Unable to cast object of type 'item here' to type 'item here'

1 Answers1