Casting a generic collection to base type

Question

I\'ve got an IList that I want to cast to ICollection but when I attempt an explicit cast, I get null

Answer 1

If .NET 3.5 is an option, you can use the Cast extension method in System.Core.dll to get a read-only IEnumerable for the collection:

using System.Linq;
...
private void Refresh() {
  PopulateList( cachedCollection.Cast( ) );
}