VB.Net, Really dumb question about As

Really dumb question about As

Author	Message
Tom Woma #1 / 5	Really dumb question about As Hi. Despite speaking no VB, I was asked last week to produce a VB.NET example of the use of an ActiveX control that a friend of mine built. This has been a surprisingly pleasant experience -- I was expecting the impossible part to be embedding the ActiveX control, whilst all I had to do was drag-and-drop -- until I came to a Menu Problem. I've got a menu zoomMenu with entries zoom50, zoom100, zoom150, zoom200. At the moment, I have handlers looking like ... handles zoom50.Click zoom50.Checked=true; zoom100.Checked=false; zoom150.Checked=false; zoom200.Checked=false; In C#, I could just do foreach Menuitem t in zoomMenu.MenuItems {t.Checked = false;} ((MenuItem)sender).Checked = true; I thought the second line translated into VB as (sender As MenuItem).Checked = true; but this gave weird syntax errors when compiled. I couldn't find a suitable example in the documentation -- any query I tried gave back five hundred answers, and when I looked through them most of them seemed irrelevant. I realise this is a fundamental VB question; I apologise for not knowing the language and hoping that I could pick it up as I went along.
Fri, 13 May 2005 19:43:28 GMT

Bill McCarth #2 / 5	Really dumb question about As Hi Tom, Quote: > foreach Menuitem t in zoomMenu.MenuItems {t.Checked = false;} > ((MenuItem)sender).Checked = true; Dim t as MenuItem ' note: in 1.1 you can inline this in the for each For each t in zoomMenu.MenuItems t.Checked = false Next CType(sender, MenuItem).Checked = true Quote: > Hi. Despite speaking no VB, I was asked last week to produce a VB.NET > example of the use of an ActiveX control that a friend of mine built. > This has been a surprisingly pleasant experience -- I was expecting > the impossible part to be embedding the ActiveX control, whilst all I > had to do was drag-and-drop -- until I came to a Menu Problem. > I've got a menu zoomMenu with entries zoom50, zoom100, zoom150, > zoom200. At the moment, I have handlers looking like > ... handles zoom50.Click > zoom50.Checked=true; > zoom100.Checked=false; > zoom150.Checked=false; > zoom200.Checked=false; > In C#, I could just do > foreach Menuitem t in zoomMenu.MenuItems {t.Checked = false;} > ((MenuItem)sender).Checked = true; > I thought the second line translated into VB as > (sender As MenuItem).Checked = true; > but this gave weird syntax errors when compiled. > I couldn't find a suitable example in the documentation -- any query I > tried gave back five hundred answers, and when I looked through them > most of them seemed irrelevant. I realise this is a fundamental VB > question; I apologise for not knowing the language and hoping that I > could pick it up as I went along.
Fri, 13 May 2005 19:53:13 GMT

Jason Sobell - iGadge #3 / 5	Really dumb question about As Us the CType command for casting. CType(sender,MenuItem).Checked = True Cheers, Jason Quote: > Hi. Despite speaking no VB, I was asked last week to produce a VB.NET > example of the use of an ActiveX control that a friend of mine built. > This has been a surprisingly pleasant experience -- I was expecting > the impossible part to be embedding the ActiveX control, whilst all I > had to do was drag-and-drop -- until I came to a Menu Problem. > I've got a menu zoomMenu with entries zoom50, zoom100, zoom150, > zoom200. At the moment, I have handlers looking like > ... handles zoom50.Click > zoom50.Checked=true; > zoom100.Checked=false; > zoom150.Checked=false; > zoom200.Checked=false; > In C#, I could just do > foreach Menuitem t in zoomMenu.MenuItems {t.Checked = false;} > ((MenuItem)sender).Checked = true; > I thought the second line translated into VB as > (sender As MenuItem).Checked = true; > but this gave weird syntax errors when compiled. > I couldn't find a suitable example in the documentation -- any query I > tried gave back five hundred answers, and when I looked through them > most of them seemed irrelevant. I realise this is a fundamental VB > question; I apologise for not knowing the language and hoping that I > could pick it up as I went along.
Fri, 13 May 2005 19:58:43 GMT

Tom Woma #4 / 5	Really dumb question about As Quote: > Hi Tom, > > foreach Menuitem t in zoomMenu.MenuItems {t.Checked = false;} > > ((MenuItem)sender).Checked = true; > Dim t as MenuItem ' note: in 1.1 you can inline this in the for each > For each t in zoomMenu.MenuItems > t.Checked = false > Next > CType(sender, MenuItem).Checked = true Thanks very much! That's tidied up the program immensely. I can't help thinking there ought to be some way of telling a menu that it should have at most one of [some group of entries] ticked; I'm sure there was one in MFC. But RadioCheck only changes the ticks into blobs, rather than requiring that there be precisely one blob, and I can't see anything which looks like a property I could group on.
Sat, 14 May 2005 18:02:13 GMT

Bill McCarth #5 / 5	Really dumb question about As Hi Tom, Well it depends on the circumstance , but if you are coding all of it, you could create a store or set of stores. For example, let's say the condition was only one checked menu item for a group then you could store a variable for that group. In your example code, that could be done as : 'code in the click event : CheckMenuExclusive(Ctype(sender,MenuItem)) Then have the following code: Private m_MenuGroups as New HashTable() Public Function CheckMenuExclusive(ByVal menu as MenuItem) Dim mi as MenuItem mi = m_MenuGroups(menu.Parent) If not mi Is Nothing Then mi.Checked = False End If menu.Checked = True m_MenuGroups(menu.Parent) = menu End Function Alternatively, you could use string keys for the groups instead of using the menu.Parent. That would probably be preferable as it would allow multipel groups on the one menu. Quote: > > Hi Tom, > > > foreach Menuitem t in zoomMenu.MenuItems {t.Checked = false;} > > > ((MenuItem)sender).Checked = true; > > Dim t as MenuItem ' note: in 1.1 you can inline this in the for each > > For each t in zoomMenu.MenuItems > > t.Checked = false > > Next > > CType(sender, MenuItem).Checked = true > Thanks very much! That's tidied up the program immensely. > I can't help thinking there ought to be some way of telling a menu > that it should have at most one of [some group of entries] ticked; I'm > sure there was one in MFC. But RadioCheck only changes the ticks into > blobs, rather than requiring that there be precisely one blob, and I > can't see anything which looks like a property I could group on.
Sat, 14 May 2005 18:22:04 GMT

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