Question

While programming over an existent class, I’ve noticed that someone has written something like this:

using(DisposableObject disp = new DisposableObject())
{
    ...
    ...

    disp.Dispose()
}

And then I wonder: isn’t the using block enough to dispose an object? Could be there any way Dispose() can be useful in such case?

Cause it doesn’t make any sense to me…

Answer 1

In your case it is useless to use dispose inside using because when using statement’s scope ends it automatically calls dispose. That’s why you can only write objects which implements IDisposable Interface inside using brackets.

using(.......)

Moreover if there was any statement using disp object after disp.Dispose() it would give an error, because by then object would have been disposed, i.e. its memory has been released.

But beware

If dispose is last line before using scope ends then it is useless.

But it is not useless when there are more lines after dispose.