Is yield useful outside of LINQ?

Question

When ever I think I can use the yield keyword, I take a step back and look at how it will impact my project. I always end up returning a collection instead of yeilding becau

Answer 1

Whenever your function returns IEnumerable you should use "yielding". Not in .Net > 3.0 only.

.Net 2.0 example:

  public static class FuncUtils
  {
      public delegate T Func();
      public delegate T Func(A0 arg0);
      public delegate T Func(A0 arg0, A1 arg1);
      ... 

      public static IEnumerable Filter(IEnumerable e, Func filterFunc)
      {
          foreach (T el in e)
              if (filterFunc(el)) 
                  yield return el;
      }


      public static IEnumerable Map(IEnumerable e, Func mapFunc)
      {
          foreach (T el in e) 
              yield return mapFunc(el);
      }
        ...