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


Determines the index of a specific item in the IList.

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

int IList.IndexOf(
	object 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.

Exception Condition

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.

This member is an explicit interface member implementation. It can be used only when the ReadOnlyCollection<T> instance is cast to an IList interface.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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