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ReadOnlyCollection<T>.IList.Contains Method

.NET Framework 4.5

Determines whether the IList contains a specific value.

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

bool IList.Contains(
	Object value
)

Parameters

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

Return Value

Type: System.Boolean
true if the Object is found in the IList; otherwise, false.

Implements

IList.Contains(Object)

Exceptions

Exception	Condition
ArgumentException	value is not of the type specified for the generic type parameter T.

Remarks

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.

Version Information

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

ReadOnlyCollection<T> Class

System.Collections.ObjectModel Namespace

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