IList or ICollection

[Anonymous]

Hi Every Buddy:

I m a new here. When I learn Filtering section of Revit API Guide I found that sometimes IList was used such as:

IList<Element> walls = collector.WherePasses(filter).OfClass(typeof(Wall)).ToElements(); and sometimes ICollection was used such as: ICollection<Element> allLoads = collector.WherePasses(filter).ToElements(); to do the filtering. My question is when we should use which and what is the diffrence between them.

Thx for any help.

[ollikat · Accepted solution]

Hi

Your question is more related to .NET than Revit API. You can find documentation of those interfaces from MSDN. Furthermore you can find discussion about the subject from here:

http://stackoverflow.com/questions/9855693/ilist-vs-icollection-vs-collection

...and probably plenty of more using google.

[Anonymous]

Thx Olikat. 

[Joe.Ye]

ollikat answered the difference of ICollection and IList.

Here is the answer of this question

>>>My question is when we should use which?

In the RevitAPI.chm file, all methods or properties signature are listed. It displays the  collection type to that is used to  store the returned values.

Regards,