Using DrawString in ComboBox onDrawItem

[JuggaloBrotha]

I'm confused on this because this works fine in VS 2008 on winXP sp2/sp3 but in VS 2008 on Vista sp1/sp2 I'm getting an Invalid Parameter exception on this line:

e.Graphics.DrawString(aColor.Name, Me.Font, br, e.Bounds.Height + 5I, ((e.Bounds.Height - Me.Font.Height) \ 2I) + e.Bounds.Top)

Here' the whole sub:

    Protected Overrides Sub onDrawItem(ByVal e As System.Windows.Forms.DrawItemEventArgs)
        e.DrawBackground()
        e.DrawFocusRectangle()
        If e.Index >= 0I Then
            ' Get the Color object from the Items list
            Dim aColor As Color = CType(Me.Items(e.Index), Color)
            ' get a square using the bounds height
            Dim rect As Rectangle = New Rectangle(5I, e.Bounds.Top + 2I, e.Bounds.Height - 3I, e.Bounds.Height - 5I)
            Dim br As Brush = If((e.State And DrawItemState.Selected) = DrawItemState.Selected, Brushes.White, Brushes.Black)
            ' draw a rectangle and fill it
            Using pn As New Pen(aColor)
                e.Graphics.DrawRectangle(pn, rect)
            End Using
            Using b As New SolidBrush(aColor)
                e.Graphics.FillRectangle(b, rect)
            End Using
            ' draw a border
            rect.Inflate(1I, 1I)
            e.Graphics.DrawRectangle(Pens.Black, rect)
            ' draw the Color name
            e.Graphics.DrawString(aColor.Name, Me.Font, br, e.Bounds.Height + 5I, ((e.Bounds.Height - Me.Font.Height) \ 2I) + e.Bounds.Top)
            br.Dispose()
        End If
    End Sub

The combobox is filled with the names of colors from the colors enum.

Anyone know why?

[JuggaloBrotha]

I forgot to post the stack trace:

System.ArgumentException was unhandled
  Message="Parameter is not valid."
  Source="System.Drawing"
  StackTrace:
       at System.Drawing.Graphics.CheckErrorStatus(Int32 status)
       at System.Drawing.Graphics.DrawString(String s, Font font, Brush brush, RectangleF layoutRectangle, StringFormat format)
       at System.Drawing.Graphics.DrawString(String s, Font font, Brush brush, Single x, Single y)
       at Controls.ColorComboBox.OnDrawItem(DrawItemEventArgs e) in C:\Users\JeffLT\Programming\Controls\Controls\ColorComboBox.vb:line 260
       at System.Windows.Forms.ComboBox.WmReflectDrawItem(Message& m)
       at System.Windows.Forms.ComboBox.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.Control.ReflectMessageInternal(IntPtr hWnd, Message& m)
       at System.Windows.Forms.Control.WmOwnerDraw(Message& m)
       at System.Windows.Forms.Control.WmDrawItem(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
       at System.Windows.Forms.ContainerControl.WndProc(Message& m)
       at System.Windows.Forms.Form.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
       at System.Windows.Forms.Control.DefWndProc(Message& m)
       at System.Windows.Forms.Control.WmOwnerDraw(Message& m)
       at System.Windows.Forms.Control.WmDrawItem(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ComboBox.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
       at System.Windows.Forms.Control.DefWndProc(Message& m)
       at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ComboBox.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(ApplicationContext context)
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
       at Controls.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
  InnerException:

[jmcilhinney]

I just tested your code on Vista x64 SP2 and I can confirm that behaviour, although I can't offer an explanation at this point.

[JuggaloBrotha]

What about Win7 (x86 and x64) ?