Ross Levis wrote:
I have a question regarding the use of "as" in this statement.
(RadioGroup1.Controls[0] as TRadioButton).SetFocus;
I've always done it like this:
TRadioButton(RadioGroup1.Controls[0]).SetFocus;
Is one more efficient or beneficial than the other?
TRadioButton(RadioGroup1.Controls[0]).SetFocus;
is a direct compile-time typecast with no error checking at all. Very
fast, ie. no time at all, but can be unsafe _if_ you are not 100% sure
that the object you are typecasting is what you think it is.
(RadioGroup1.Controls[0] as TRadioButton).SetFocus;
is a run-time typecast that checks the typecast is valid for that class.
Slower, but safer for those cases where the object may not be what you
think it should be.
--
Sly
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