List<T>.IList.IndexOf(Object) Method

Definition

Determines the index of a specific item in the IList.

 virtual int System.Collections.IList.IndexOf(System::Object ^ item) = System::Collections::IList::IndexOf;
int IList.IndexOf (object item);
abstract member System.Collections.IList.IndexOf : obj -> int
override this.System.Collections.IList.IndexOf : obj -> int
Function IndexOf (item As Object) As Integer Implements IList.IndexOf

Parameters

item
Object

The object to locate in the IList.

Returns

Int32

The index of item if found in the list; otherwise, -1.

Implements

Exceptions

item is of a type that is not assignable to the IList.

Remarks

This method determines equality using the default equality comparer EqualityComparer<T>.Default for T, the type of values in the list.

This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.

Applies to