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Lookup<TKey, TElement>.Item Property

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Gets the collection of values indexed by the specified key.

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

Syntax

'Declaration
Public ReadOnly Property Item ( _
    key As TKey _
) As IEnumerable(Of TElement)

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]

Remarks

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 key is not found in the collection, an empty sequence is returned.

Examples

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.
Dim cgroup As System.Collections.Generic.IEnumerable(Of String) = lookup("C"c)

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

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.