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

Definition

Determines the index of a specific item in the IList.

 virtual int System.Collections.IList.IndexOf(System::Object ^ value) = System::Collections::IList::IndexOf;
int IList.IndexOf (object value);
Function IndexOf (value As Object) As Integer Implements IList.IndexOf

Parameters

value
Object

The Object to locate in the IList.

Returns

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

Implements

Exceptions

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

Remarks

This method determines equality using the default comparer Comparer<T>.Default. Comparer<T>.Default checks whether type T implements System.IComparable<T> and uses that implementation, if available. If not, Comparer<T>.Default checks whether type T implements System.IComparable. If type T does not implement either interface, this method uses Object.Equals.

This method is an O(n) operation, where n is Count.

Applies to