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IReadOnlyDictionary<TKey, TValue>.Item Property

.NET Framework 4.5

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

Namespace:  System.Collections.Generic
Assemblies:   mscorlib (in mscorlib.dll)
  System.Runtime (in System.Runtime.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.

.NET Framework

Supported in: 4.5.3

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8

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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