Question

I’m trying to convert the windows application to wpf application, and everything is fine but i was Struck at this point converting the bellow declaration not working out in code of wpf.

these are windows declarations,

Dim screenwidth As String = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width

Dim screenheight As String = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height

i googled to find the equivalent class properties for these declarations and i got some thing, but those are existing but not working at the point of time i’m trying to use them at

“PointToScreen(New Point(0,0))”
they are:

If i use these in my code:

Dim screenwidth As String = System.Windows.SystemParameters.VirtualScreenWidth
Dim screenheight As String = System.Windows.SystemParameters.VirtualScreenHeight
‘(OR)

Dim screenwidth As String = System.Windows.SystemParameters.PrimaryScreenWidth
Dim screenheight As String = System.Windows.SystemParameters.PrimaryScreenHeight

       With MyPanel
            .PointToScreen(New Point(SystemParameters.VirtualScreenWidth, 0)) ' Getting Exception in this line               
            .Height = (80 / 1080) * screenheight
            .Width = screenwidth                
            .Background = New SolidColorBrush(Colors.Transparent)
        End With

Am getting the exception as Invalid Operation Exception saying that
“The visual is not connected to PresentationSource.”

i alreadt tried this post http://social.msdn.microsoft.com/Forums/en/wpf/thread/f3c982a1-ca16-4821-bf08-f6dd8ff8d829
, but i want to try it out using PointToScreen only.

How can i resolve this ????
Please help me

Answer 1

Hi try this to get the Width and height of screen.

double width=System.Windows.SystemParameters.PrimaryScreenWidth;
double height = System.Windows.SystemParameters.PrimaryScreenHeight;

The exception is because you are pointing Mypanel before it is rendered. Do it like this

if (MyPanel.IsVisible)
        { 
            MyPanel
            .PointToScreen(New Point(SystemParameters.PrimaryScreenWidth, 0)) ' Getting Exception in this line               
            .Height = (80 / 1080) * screenheight
            .Width = screenwidth                
            .Background = New SolidColorBrush(Colors.Transparent)
        }

I hope this will help.