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

Definition

Namespace:
System.Collections.Generic
Assemblies:
mscorlib.dll, System.Runtime.dll
Assemblies:
netstandard.dll, System.Runtime.dll
Assembly:
System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll
Source:
IReadOnlyDictionary.cs
Source:
IReadOnlyDictionary.cs
Source:
UnhandledExceptionEventArgs.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

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

key is null.

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.

Applies to

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