Dialogs
Dialog is a special window that pops up to give and/or get info from the user
It is MODAL meaning you cannot interact with other windows while it is shown
Showdialog() method allows you to show a form as modal
The rest of your app stops running until you close this form
Show() method creates a modeless window
Modeless- does not stop code from executing in the rest of your app
Messagebox
Messagebox is simplest dialog
Simple Example:
Messagebox.show(“Message here”)
The method is overloaded so you can call it a number of ways
Messagebox.show([message],[dialog caption],[buttons],[icons])
- Message is a string- message to display
- Dialog caption-text displayed in title bar
- Buttons parameter accepts an Enum with following values
- Messageboxbuttons.abortretryignore
- Messageboxbuttons.ok
- Messageboxbuttons.okcancel
- Messageboxbuttons.retrycancel
- Messageboxbuttons.yesno
- Messageboxbuttons.yesnocancel
- Icon also has an enum value
- Messageboxicon.asterisk
- Messageboxicon.error
- Messageboxicon.exclamation
- Messageboxicon.hand
- Messageboxicon.information
- Messageboxicon.none
- Messageboxicon._question
- Messageboxicon.stop
- Messageboxicon.warning
It will return an enumerated value in dialogResult telling you the button they clicked
- dialogResult.ok
- dialogResult.retry
- dialogResult.cancel
Example of messagebox
- Create a new windows project
- Go into formclosing event handler
Dim result as dialogresult
- Then add this line(all in one line)
Result=messagebox.show(“Close form?”,”quit?”,messageboxbuttons.yesno,messageboxicon.question)
- Then add the following code:
If result=windows.forms.dialogresult.no then
e.cancel=true
end if
This code displays a messagebox when you close a form, and if you click No then it cancels the closing of the form.