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.NET Forum / Languages / VB.NET / March 2008What's wrong with this site.DesignMode code
Can you see what is wrong with the code below. Or suggest a better way. Sometimes when I know I'm in the Designer I hit the bottom MessageBox I think it might be because Site has not been set yet Because I think it might happen while InitializeComponent is setting properties and/or when OnLoad is running. Thanks for any help Public Shared Function IsDesign(ByVal c As Control) As Boolean If c Is Nothing Then MessageBox.Show("C is Nothing"... End If Dim nextControl As Control = c Dim site As ISite While nextControl IsNot Nothing site = nextControl.Site If site IsNot Nothing Then If site.DesignMode Then Return True End If nextControl = nextControl.Parent End While MessageBox.Show(" Return False " ... Return False End Function Where are you running this? It won't work in the constructor (and there's no workaround for that). /claes > Can you see what is wrong with the code below. > [quoted text clipped - 40 lines] > > End Function In a constructor but not the first one executed. The main window is already open and I'm opening another form when I do the check. Seems like Site for the main window would be set since the window is completely opened before the other form is instantiated. Is it the problem that Parent property is not set yet? Or maybe the Main form is not the Parent of the other form even though it opened it? Can you suggest an alternative. Maybe get a reference to the main form to the other form so it can check that? Thanks > Where are you running this? It won't work in the constructor (and there's > no workaround for that). [quoted text clipped - 45 lines] >> >> End Function The main form is not the parent of the new form. If you use the version of ShowDialog/Show that take a IWin32Window argument and pass the Mainform to it, it will be the owner though. In that case you can use the Owner property in the other form to get a reference to the main form. Still, that property won't be available in the constructor. You would need to pass a reference to the constructor if you want to get access to the main form in there. Sounds unlikely that your main form will be in design mode in this situation though... Can you describe what you're trying to accomplish? /claes > In a constructor but not the first one executed. > The main window is already open and I'm opening another form when I do [quoted text clipped - 64 lines] >>> >>> End Function Thanks for the interest. Is Owner and Parent the same thing? > The main form is not the parent of the new form. If you use the version of > ShowDialog/Show that take a IWin32Window argument and pass the Mainform to > it, it will be the owner though. In that case you can use the Owner > property in the other form to get a reference to the main form. Still, > that property won't be available in the constructor. The Site and Owner property gets set after the constructor is run? Is there documentation saying which properties are or are not set before the constructor is run? >You would need to pass a reference to the constructor if you want to get >access to the main form in there. > > Sounds unlikely that your main form will be in design mode in this > situation though... As I think about it now - I don't think this relates. The problem relates to the Designer displaying the form and I believe it will use a parameterless constructor. Also, I have no control of how it shows it. So I have to be sure not to check Site uintil I know it has been set. Knowing which events the Designer might raise would also help. (For a form and also for a usercontrol on a form) I may be checking when I do not have to. Is that documented? > Can you describe what you're trying to accomplish? One example is that I save a forms position in the registry and restore the position next time it is open. I don't want to do these things in DesignMode. There are other similar things. Thanks again > /claes > [quoted text clipped - 66 lines] >>>> >>>> End Function > Thanks for the interest. > > Is Owner and Parent the same thing? No, not in this case >> The main form is not the parent of the new form. If you use the version >> of ShowDialog/Show that take a IWin32Window argument and pass the [quoted text clipped - 5 lines] > Is there documentation saying which properties are or are not set before > the constructor is run? Basically nothing is set in the constructor so you should avoid doing much in there. >>You would need to pass a reference to the constructor if you want to get >>access to the main form in there. [quoted text clipped - 6 lines] > parameterless constructor. Also, I have no control of how it shows it. > So I have to be sure not to check Site uintil I know it has been set. Correct, you won't be able to control the constructor that the designer uses. > Knowing which events the Designer might raise would also help. (For a form > and also for a usercontrol on a form) I may be checking when I do not have > to. Is that documented? Not that I know of. >> Can you describe what you're trying to accomplish? > > One example is that I save a forms position in the registry and restore > the position next time it is open. > > I don't want to do these things in DesignMode. In this particular situation you should be able to move your code to the Load and Closed events. In there you can check the design mode. /claes Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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