> >> public class myclass
> >> {
> >> string Field1;
> >> bool Field2;
> >> }
> >>
> >> However, these are fields, rather than properties.
> >
> > Paul -- what's the difference? Are these like "private fields" for this
> > class to use?
>
>Well, they are private, but only because I made a mistake: :-)
>
>public class myclass
>{
> public string Field1;
> public bool Field2;
>}
>
>Fields are simpler than properties (get; set), and you have less control.
>For example, a property can be read-only, or throw an exception on an
>invalid value.
I'm pretty sure, if I'm remembering my C++ correctly, that you can directly
access a field from outside a class as long as you declare it public in
that language also.
In VFP you can use an _assign method on a class property to implement
read-only or validation. You can, of course, also make the the property
"protected" or "hidden" and write get/set methods on the class to govern
access if you want. VFP's implementation of "hidden" is annoying in certain
contexts, though.
You will sometimes see in programming literature the assertion that get/set
methods should be used with every property to ensure that properties are
used only as intended by the designer. The people who make these assertions
tend to forget that not every project involves creating classes that will
be used in contexts not controlled by the designer. In most cases in
single-developer projects, get/set methods are overkill.
>When databinding you must use properties.
That would seem to be somewhat annoying.
Ken Dibble
www.stic-cil.org
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