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Lookup<TKey, TElement>.Item Property

Gets the collection of values indexed by the specified key.

Namespace:  System.Linq
Assembly:  System.Core (in System.Core.dll)
public IEnumerable<TElement> this[
	TKey key
] { get; }

Parameters

key
Type: TKey
The key of the desired collection of values.

Property Value

Type: System.Collections.Generic.IEnumerable<TElement>
The collection of values indexed by the specified key.

Implements

ILookup<TKey, TElement>.Item[TKey]

This indexed property provides the ability to index a specific collection of values in the Lookup<TKey, TElement> by using the following syntax: myLookup[key] in Visual C# or myLookup(key) in Visual Basic. If the key is not found in the collection, an empty sequence is returned.

The following example demonstrates how to use Item to index directly into a Lookup<TKey, TElement>. This code example is part of a larger example provided for the Lookup<TKey, TElement> class.


// Select a collection of Packages by indexing directly into the Lookup.
IEnumerable<string> cgroup = lookup['C'];


.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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