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

Reference

Definition

Namespace:: System.Linq

Assemblies:: System.Core.dll, System.Linq.dll

Assemblies:: netstandard.dll, System.Linq.dll

Assembly:: System.Linq.dll

Assembly:: System.Core.dll

Assembly:: netstandard.dll

Source:: Lookup.cs

Source:: Lookup.cs

Source:: Lookup.cs

Important

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

public:
 virtual bool Contains(TKey key);

public bool Contains(TKey key);

abstract member Contains : 'Key -> bool
override this.Contains : 'Key -> bool

Public Function Contains (key As TKey) As Boolean

Parameters

key: TKey

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

Returns

Boolean

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

Implements

Contains(TKey)

Examples

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');

' Determine if there is a key with the value 'G' in the Lookup.
Dim hasG As Boolean = lookup.Contains("G"c)

Applies to

Termék	Verziók
.NET	Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1
UWP	10.0

Megosztás a következőn keresztül: