| find_index(PredicateT) | Searches for an element that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the entire inference results. |
| find_index(Int32, PredicateT) | Searches for an element that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the range of elements in the inference results that extends from the specified index to the last element. |
| find_index(Int32, Int32, PredicateT) | Searches for an element that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the range of elements in the inference results that starts at the specified index and contains the specified number of elements. |