Collection<T>.IList.IndexOf Method

July 28, 2014

Determines the index of a specific item in the IList.

Namespace:  System.Collections.ObjectModel
Assembly:  mscorlib (in mscorlib.dll)

int IList.IndexOf(
	Object value
)

Parameters

value
Type: System.Object
The Object to locate in the IList.

Return Value

Type: System.Int32
The index of value if found in the list; otherwise, -1.

Implements

IList.IndexOf(Object)

ExceptionCondition
ArgumentException

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

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.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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