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);
Function IndexOf (item As Object) As Integer Implements IList.IndexOf

Parameters

item
Object

The object to locate in the IList.

Returns

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