| IndexOf(T) | 索引 |
| IndexOf(T, Int32) | Searches for the specified object and returns the zero-based index of the first occurrence within the range of elements in the ListT that extends from the specified index to the last element. |
| IndexOf(T, Int32, Int32) | Searches for the specified object and returns the zero-based index of the first occurrence within the range of elements in the ListT that starts at the specified index and contains the specified number of elements. |