Dictionary In C#

· A C# dictionary is a generic collection of key-value pairs.

· The keys must be unique, but the values can be duplicated.

· Dictionaries are implemented as hash tables so their keys can quickly access them.

· If you want create a dictionaries in C#, you must have to use  the Dictionary<TKey, TValue> class , where TKey is the type of the keys, and TValue is the type of the values.

· Here are some of the advantages of using dictionaries in C#:

· They are very efficient for accessing values by their keys.

· They can be used to store a large number of key-value pairs.

· They are easy to use and manage.

· Here are some of the disadvantages of using dictionaries in C#:

· They can be slow for iterating over all the key-value pairs.

· They can be memory-intensive if they store a large number of key-value pairs.

· Here are some examples of when you might use a dictionary in C#:

· To store a mapping of names to phone numbers.

· To store a mapping of countries to capital cities.

· To store a mapping of words to their definitions.

· To store a mapping of user IDs to user profiles.

· To store a mapping of product IDs to product prices.

· C# Dictionary class is a generic collection of keys and values pair of data.

· The Dictionary class is defined in the System.Collections.

· A generic namespace is a class that can store any data type in keys and values. Each key must be unique in the collection.

· Before you use the Dictionary class in your code, you must import the System.Collections.Generic namespace using the following line.

· using System.Collections.Generic;