Question

Possible Duplicate:
c#: how do I remove an Item inside IEnumerable

I have an Inumerable of Objects foo.

 public IEnumerable<foo> listOfFoo{ get; set; }

Foo has Id and name lets say.

I want to pass an ID to a method and the method should remove the object with that ID from the IEnumerable and return it.

Whats the best way of doing it?

Answer 1

That’s not possible for any collection that implements IEnumerable<foo>. If it is for example a List<foo>, then it’s possible to remove items for it, but if it is for example a foo[] it’s not possible to remove items.

If you use a List<foo> instead:

public foo Extract(int id) {
  int index = listOfFoo.FindIndex(x => x.Id == id);
  foo result = listOfFoo[index];
  listOfFoo.removeAt(index);
  return result;
}