C#

class MyArray : System.Array
{
   public Object GetXXX(int myKey)
   {
      foreach (Object obj in this)
      {
         // Find your object.
      }
      return null; // Object not found.
   }
}

Robert Rohde wrote:

you just have to add some typesafe versions of Add, Remove, this[int index] etc.

public class MyCollection : CollectionBase {
//functions like Count, RemoveAt, GetEnumerator are already implemented

//now some typesafe function...
public void Add(MyItem item){
base.InnerList.Add(item);
}
public void Remove(MyItem item){
base.InnerList.Remove(item);
}
public MyItem this[int index]{
get { (MyItem)return base.InnerList[index]; }
}

//other functions...
}

GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();