How can i cast into a ObservableCollection<object>

Question

How can i cast

from ObservableCollection<TabItem> into ObservableCollection<object>

this doesnt work for me

(ObservableCollection<object>)myTabItemObservableCollection

Answer 1

You can't. ObservableCollection<TabItem> does not derive from ObservableCollection<object>.

If you explain why you would want to perhaps we can point out an alternative interface you can use.

Answer 2

you can't in .net 3.5, .net 4 solve this problem in more elegant way. in .net 3.5 you should copy like this

return new ObservableCollection<object>(myTabItemObservableCollection);

Answer 3

Basically, you can't. Not now, and not in .NET 4.0.

What is the context here? What do you need? LINQ has Cast<T> which can get you the data as a sequence, or there are some tricks with generic methods (i.e. Foo<T>(ObservalbleCollection<T> col) etc).

Or you can just use the non-generic IList?

IList untyped = myTypedCollection;
untyped.Add(someRandomObject); // hope it works...

Answer 4

you could use IEnumerable.Cast<T>()

Answer 5

thanx for all answers, but I think I have solve this problem self with a "helpermethode".

Perhaps has any a better method or a linq statement for this.

private void ConvertTabItemObservableCollection()
{
  Manager manager = this.container.Resolve<Manager>();
  foreach (var tabItem in manager.ObjectCollection)
  {
    TabItemObservableCollection.Add((TabItem)tabItem);
  }
}