FindIndexOf(PredicateAction) | Searches for an Action that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the collection. |
FindIndexOf(Int32, Int32, PredicateAction) | Searches for an Action that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the collection that starts at the specified index and contains the specified number of elements. |