Lookup<TKey, TElement>.Contains Method (TKey)


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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


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.

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');

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
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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