Item Property
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IReadOnlyDictionary<TKey, TValue>.Item Property

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Gets the element that has the specified key in the read-only dictionary.

Namespace:  System.Collections.Generic
Assembly:  mscorlib (in mscorlib.dll)

TValue this[
	TKey key
] { get; }

Parameters

key
Type: TKey
The key to locate.

Property Value

Type: TValue
The element that has the specified key in the read-only dictionary.

ExceptionCondition
ArgumentNullException

key is null.

KeyNotFoundException

The property is retrieved and key is not found.

This property lets you access a specific element in the collection by using the following syntax: myCollection[key] (myCollection(key) in Visual Basic).

Implementations can vary in how they determine the equality of objects: for example, the class that implements IReadOnlyDictionary<TKey, TValue> might use the Comparer<T>.Default property, or it might implement the IComparer<T> method.

Implementations can vary in whether they allow key to be null.

Windows Phone OS

Supported in: 8.1, 8.0

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