Is it possible to have a property that is IEnumerable<T>?

Question

I have a class that's IEnumerable<T> where I want to have different properties that provides a filtered IEnumerable<T> access.

So for instance:

class Shape
   ShapeType = Box/Sphere/Pyramid

class ShapeCollection : IEnumerable<Shape>
{
   public IEnumerable<Shape> OnlyBox
   {
       foreach(var s in this)
       {
           if (s.ShapeType == Box)
               yield return s;
       }
   }
}

Is this how it should be? Just not sure, about it completely.

Thanks.

Answer 1

Sure, but you might want to rewrite it as

public IEnumerable<Shape> OnlyBox
{
    get { return this.Where(x => x.ShapeType == ShapeType.Box); }
}

which does the exact same thing.

Answer 2

class ShapeCollection : IEnumerable<Shape>
{
   public IEnumerable<Shape> OnlyBoxes
   {
       get { return this.Where(s => s.ShapeType == Box); }
   }
}

You were missing the get/parenthesis to make it a method. Also what is Box, did you mean ShapeType.Box? Also maybe rename it to OnlyBoxes, seems more descriptive.