Late Binding?

Hello all,

I tried making my application with Option Strict On. Arg!! I understand the implicit conversion errors and functions that have to have their return type declared, but what is it with late binding? I can't declare a variable of type [some object type] and then assign an object to it? That seems really stupid.

Lets say I try to do this:

VB Code:

Dim item As ListViewItem
            item = sender.GetItemAt(e.X, e.Y)

I tried making it work like this:

VB Code:

Dim item As ListViewItem = sender.GetItemAt(e.X, e.Y)

How could I do what I am trying to do with Option Strict On?

Thanks.

Presumably you're executing this code in an Event, so Sender is of type Object.
To support Option Strict you need to cast the sender variable to a ListView, i.e.

VB Code:

Dim item As ListViewItem = CType(sender, ListView).GetItemAt(e.X, e.Y)

Regards,

- Aaron.

Once again. Thank you Aaron!

Hi,

FYI DirectCast is substantially faster than CType. Convert. is slightly faster again but is not applicable to your requirement.

Quote:

---

FYI DirectCast is substantially faster than CType. Convert. is slightly faster again but is not applicable to your requirement

---

I was under the impression that CType was faster than Convert because CType is compliled inline whereas Convert requires a function call.

I would be very interested in seeing which is faster. Any body want to run some tests?

Hi,

Tests have been posted in at least one other thread. DirectCast is 4 or 5 times faster than CType. Convert, when you can use it, is 5% faster than DirectCast.

have a look at

http://www.vbforums.com/showthread.p...ght=DirectCast

It really is a question of horses for courses.