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: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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