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Collection<T>.IList.IndexOf Method

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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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