IList.IndexOf Method

ReadOnlyCollection<T>.IList.IndexOf Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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 not of the type specified for the generic type parameter T.

This method determines equality using the default comparer EqualityComparer<T>.Default.

This method performs a linear search; therefore, 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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