Re: generic List<>

Thanks all for those additional comments.  I looked at the 'RemoveAll'
method - interesting but I think Peter Ritchie's comment about just not
enumerating using the collected object type will be most useful for my
situation.

Peter

> -----Original Message-----
> From: Discussion relating to the specifics of the C# and
> Managed C++ languages [mailto:[email protected]]
> On Behalf Of Peter Ritchie
> Sent: Wednesday, August 30, 2006 10:38 AM
> To: [email protected]
> Subject: Re: [DOTNET-CX] generic List<>
>
> Only removal of collection items while using the IEnumerator
> interface is not supported.  You can enumerate a collection
> in other ways, without creating a new collection and copying
> a bunch of references.
>
> For example:
>  for (int i = (myObjects.Count - 1); i >= 0; --i)  {
>   myObjects mo = myObjects[i];
>   if (mo.CanBeRemoved)
>   {
>    myObjects.Remove(mo);
>   }
>  }
>
> On Wed, 30 Aug 2006 16:06:31 +0200, Efran Cobisi <[email protected]>
> wrote:
>
> >Nope. By design you are not allowed to make any changes to the
> >collection you are iterating.
> >The workaround for this depends on the situation. For most
> scenarios,
> >you could just copy the references of the objects you wish to be
> >deleted in another collection and then, while iterating the latter,
> >delete these objects from the former.
> >
> >List<myObject> myTemp = new List<myObject>();
> >
> >foreach (MyObject mo in myObjects)
> >{
> >    if (mo.CanBeRemoved==true)
> >        myTemp.Add(mo);
> >}
> >
> >foreach (MyObject mo in myTemp)
> >        myObjects.Remove(mo);
> >
> >
> >HTH
> >
> >Efran Cobisi, cobisi.com
> >
> >Peter Osucha wrote:
> >> I have a generic List<myObject> collection 'myObjects'.  MyObject
> instances
> >> have a bool property 'CanBeRemoved'.
> >>
> >> But apparently, it is invalid to
> >>
> >> foreach (MyObject mo in myObjects)
> >> {
> >>     if (mo.CanBeRemoved==true) myObjects.Remove(mo); }
> >>
> >> Is there a way to remove items from such collection while looping
> through
> >> the collection?
> >>
> >> Peter

===================================
This list is hosted by DevelopMentor®  http://www.develop.com

View archives and manage your subscription(s) at http://discuss.develop.com