Contains Method
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ICollection<T>.Contains Method

Determines whether the ICollection<T> contains a specific value.

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

bool Contains(
	T item
)

Parameters

item
Type: T
The object to locate in the ICollection<T>.

Return Value

Type: System.Boolean
true if item is found in the ICollection<T>; otherwise, false.

Implementations can vary in how they determine equality of objects; for example, List<T> uses Comparer<T>.Default, whereas Dictionary<TKey, TValue> allows the user to specify the IComparer<T> implementation to use for comparing keys.

.NET Framework

Supported in: 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

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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