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ILookup<TKey, TElement>.Contains Method

Determines whether a specified key exists in the ILookup<TKey, TElement>.

Namespace:  System.Linq
Assembly:  System.Core (in System.Core.dll)

bool Contains(
	TKey key


Type: TKey
The key to search for in the ILookup<TKey, TElement>.

Return Value

Type: System.Boolean
true if key is in the ILookup<TKey, TElement>; otherwise, false.

.NET Framework

Supported in: 4, 3.5

.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 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.