IReadOnlyDictionary<TKey,TValue>.Item[TKey] Property

Definition

Namespace:

System.Collections.Generic

Assembly:

System.Runtime.dll

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

public:
 property TValue default[TKey] { TValue get(TKey key); };

public TValue this[TKey key] { get; }

member this.Item('Key) : 'Value

Default Public ReadOnly Property Item(key As TKey) As TValue

Parameters

key

TKey

The key to locate.

Property Value

TValue

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

Exceptions

ArgumentNullException

key is null.

KeyNotFoundException

The property is retrieved and key is not found.

Remarks

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.