Mastering C# and .NET/

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Dictionary

Dictionary

Learn to store key-value pairs.

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Overview

Dictionaries are key-value stores. These are mappings between keys and associated values. We can imagine a dictionary as a book where we have words and associated translations. Words are keys and translations are values:

%0 node_2 White node_1639590737864 Blanco node_2->node_1639590737864 node_1 House node_1_1 La Casa node_1->node_1_1 node_0 Hello node_0_1 Hola node_0->node_0_1
An example of a dictionary

Keys in .NET dictionaries must be unique. It’s impossible to have two identical keys. Values aren’t unique, though.

Syntax

Dictionaries in .NET are created by instantiating the Dictionary<K, V> class. We can use any type as a key and any type as a value:

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