Hello,
I got the following scenario :
ComboBox in UI where the user chooses one of the options and according
to his/her choise - I create new object (or sub form). What is the best
way doing it? (I can do switch with cases but it seems not good enough)
Thanks!


*** Sent via Developersdex http://www.developersdex.com ***

If this is four options that are known at compile-time, then switch
should be fine. If you need the same code repeatedly, and the 4
options share some commonality (base-class or interface) then perhaps
make a factory method that accepts an enum and returns the common-
factor, i.e.

static IFoo CreateFoo(FooType type) // an enum
{
switch(type) {
case type.SimpleFoo: return new SimpleFoo();
...
default: throw new ArgumentException("type");
}
}

If the types aren't known in advance (i.e. it comes from a database),
then you'd need a factory approach, perhaps with reflection
(Type.GetType(name) and/or Activator.CreateInstance()) - but this is
slower and more complex.

But keep it simple if you can - it will be easier to debug, which is
worth a lot.

In this case, I would recommend a class factory pattern:

http://en.wikipedia.org/wiki/Factory_method_pattern


--
- Nicholas Paldino [.NET/C# MVP]
- (E-Mail Removed)

"csharpula csharp" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>
> Hello,
> I got the following scenario :
> ComboBox in UI where the user chooses one of the options and according
> to his/her choise - I create new object (or sub form). What is the best
> way doing it? (I can do switch with cases but it seems not good enough)
> Thanks!
>
>
> *** Sent via Developersdex http://www.developersdex.com ***

"csharpula csharp" <(E-Mail Removed)> schrieb im Newsbeitrag
news:(E-Mail Removed)...
>
> Hello,
> I got the following scenario :
> ComboBox in UI where the user chooses one of the options and according
> to his/her choise - I create new object (or sub form). What is the best
> way doing it? (I can do switch with cases but it seems not good enough)
> Thanks!
>
It depends on the rules wich etnries should be shown in the DropDown and
wich form should be opend when.
In the easy case of a fixed (not to large) set of entries and each opens a
certain form I'd say switch is OK.

In other cases: It depends

But it should also be considered how the list/rules my change in future.
(Maintainability)

Christof