Functions

[oddball]

Can you call a Function (rather than a sub) from the OnIndexChanged event of a dropdownlist control. If you can why do i get this error:

BC30408: Method 'Public Function ProdDefList() As System.Collections.ICollection' does not have the same signature as delegate 'Delegate Sub EventHandler(sender As Object, e As System.EventArgs)'.

 

[jfrost10]

Could you post your code up for us to have a look at?


Jack

 

[link9]

You could call a function, but why? Where will your return value go? If you want it to be a function, then just give it the same signature:

Public Function ProdDefList(o as object, e as eventArgs)

but to my point, when using a function, this function should return a value, so:

Public Function ProdDefList(o as object, e as eventArgs) as integer

or whatever just doesn't make sense, since you'd be sending the return value off into deep space. Typically, just make it a sub with the handles keyword after the sub:

Protected Sub ProdDefList(o as object, e as eventArgs) handles myListBox.selectedIndexChanged

Maybe I'm missing your point. What's the reasoning behind wanting to use a function instead of a sub?

paul

 

[jfrost10]

Paul: could be that he doesn't know the ins/outs of vb.net
(thats not a slag oddball, just noticed you listed yourself as a Technical User instead of a Programmer).

Oddball: If Paul is bang on about what you're trying to do (i.e. return some value), you're better off assigning whatever value you're looking for to either a session variable, adding it to the viewstate, or even just dealing with the data inside the event.

A function needs to be called from something that can use the return value. If your ddl index changes, thats really an event; another bit of code isn't calling it.

If we're on the same wavelength, and you need further tips on the Session/Viewstate, etc. just let us know


Jack