create a dictionary in csharp

In C#, a dictionary is a common data structure used to store key-value pairs. To create a dictionary in C#, follow these steps:

Import the System.Collections.Generic namespace, which contains the Dictionary class.


main.cs
using System.Collections.Generic;
34 chars
2 lines

Declare a Dictionary variable, specifying the data types for the keys and values.


main.cs
Dictionary<string, int> myDictionary;
38 chars
2 lines

In this example, the keys are strings and the values are integers.

Instantiate the dictionary using the constructor.


main.cs
myDictionary = new Dictionary<string, int>();
46 chars
2 lines

Add key-value pairs to the dictionary using the Add() method.


main.cs
myDictionary.Add("apple", 5);
myDictionary.Add("banana", 2);
myDictionary.Add("pear", 3);
90 chars
4 lines

Access a value in the dictionary by specifying its key using the indexer.


main.cs
int appleCount = myDictionary["apple"];
40 chars
2 lines

In this example, the appleCount variable will have the value of 5.

Here's the full code:


main.cs
using System.Collections.Generic;

Dictionary<string, int> myDictionary;
myDictionary = new Dictionary<string, int>();

myDictionary.Add("apple", 5);
myDictionary.Add("banana", 2);
myDictionary.Add("pear", 3);

int appleCount = myDictionary["apple"]; // appleCount is 5
270 chars
11 lines

similar csharp code snippets

find the value associated with a key in a map in csharp

add a key-value pair to a map in csharp

insert an element into an array at a specific index in csharp

remove an element from the middle of an array in csharp

remove an element from an array at a specific index in csharp

find the index of an element in an array in csharp

remove an element from the beginning of an array in csharp

sort an array in csharp

add an element to the beginning of an array in csharp

add an element to the end of an array in csharp

related categories