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Lookup<TKey, TElement>.Contains Method

Determines whether a specified key is in the Lookup<TKey, TElement>.

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

public bool Contains(
	TKey key
)

Parameters

key
Type: TKey
The key to find in the Lookup<TKey, TElement>.

Return Value

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

Implements

ILookup<TKey, TElement>.Contains(TKey)

The following example demonstrates how to use Contains to determine whether a Lookup<TKey, TElement> contains a specified key. This code example is part of a larger example provided for the Lookup<TKey, TElement> class.


// Determine if there is a key with the value 'G' in the Lookup.
bool hasG = lookup.Contains('G');


.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.

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