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c# dictionary

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SubZero answered on January 26, 2021 Popularity 10/10 Helpfulness 1/10

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c# dictionary

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A dictionary is a collection that contains key-value pairs where each key is associated with a value. In C#, the dictionary is implemented by the Dictionary class.

// Create a new dictionary that maps strings to integers
Dictionary<string, int> myDictionary = new Dictionary<string, int>();

// Add some key-value pairs to the dictionary
myDictionary.Add("apple", 1);
myDictionary.Add("banana", 2);
myDictionary.Add("orange", 3);

// Access a value by its key
int bananaValue = myDictionary["banana"];  // returns 2

// Modify a value by its key
myDictionary["orange"] = 4;

// Remove a key-value pair
myDictionary.Remove("apple");

// Check if a key exists in the dictionary
bool containsKey = myDictionary.ContainsKey("apple");  // returns false

// Iterate over the key-value pairs in the dictionary
foreach (KeyValuePair<string, int> pair in myDictionary)
{
    string key = pair.Key;
    int value = pair.Value;
    Console.WriteLine("{0}: {1}", key, value);
}

This code creates a dictionary that maps strings to integers, adds some key-value pairs to the dictionary, accesses and modifies values by their keys, removes a key-value pair, checks if a key exists in the dictionary, and iterates over the key-value pairs in the dictionary.

Popularity 10/10 Helpfulness 1/10 Language csharp

Source: Grepper

Tags: c# dictionary

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Contributed on Mar 05 2023

SubZero

0 Answers Avg Quality 2/10

Closely Related Answers

dictionary c#

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// Create a dictionary with 2 string values
Dictionary<string, string> capitalOf = new Dictionary<string, string>();

// Add items to the dictionary
capitalOf.Add("Japan", "Tokio");
capitalOf.Add("Portugal", "Lissabon");

// Loop over the dictionary and output the results to the console
foreach (KeyValuePair<string, string> combi in capitalOf)
{
  Console.WriteLine("The capital of " + combi.Key + " is " + combi.Value);
}

Popularity 10/10 Helpfulness 6/10 Language csharp

Source: Grepper

Tags: c# c

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Contributed on Oct 30 2021

Dynerus Parker

0 Answers Avg Quality 2/10

C# Dictionary

Comment

Dictionary<string, int> myDictionary = new Dictionary<string, int>()
{
    { "key1", 1 },
    { "key2", 2 },
    { "key3", 3 }
};

// Alternatively as a var:

var myVarDictionary = new Dictionary<string, int>()
{
    { "key1", 1 },
    { "key2", 2 },
    { "key3", 3 }
};

// Check Values:

myDictionary.Add("key4", 4);
myDictionary.Remove("key1");
int value = myDictionary["key2"];

if(myDictionary.ContainsKey("key4")){
   // ...
}

Popularity 10/10 Helpfulness 4/10 Language csharp

Source: Grepper

Tags: c# c

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Contributed on Jan 14 2023

vexeval

0 Answers Avg Quality 2/10

declare dictionary c#

Comment

        var students2 = new Dictionary<int, StudentName>()
        {
            [111] = new StudentName { FirstName="Sachin", LastName="Karnik", ID=211 },
            [112] = new StudentName { FirstName="Dina", LastName="Salimzianova", ID=317 } ,
            [113] = new StudentName { FirstName="Andy", LastName="Ruth", ID=198 }
        };

Popularity 10/10 Helpfulness 4/10 Language csharp

Source: Grepper

Tags: c# c

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Contributed on Jan 26 2021

Crazy Cheetah

0 Answers Avg Quality 2/10

dictionary in c#

Comment

A Dictionary is a data structure representing a collection of
key-value pairs. Each key in the Dictionary must be unique.

using System;
using System.Collections.Generic;

namespace CodeTest
{
    public class Program
    {
        static void Main(string[] args)
        {
            var currencies = new Dictionary<string, string>();
            currencies["USA"] = "USD";
            currencies["Bangladesh"] = "BDT";
            currencies["Belgium"] = "EUR";
          
            Console.WriteLine(currencies["USA"]);
        }  
    }
}

Popularity 10/10 Helpfulness 3/10 Language csharp

Source: Grepper

Tags: c# c

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Contributed on Dec 02 2022

Rasel Ahmed

0 Answers Avg Quality 2/10

dictionary c#

Comment

// C# program to illustrate Dictionary
using System;
using System.Collections.Generic;
 
class GFG {
 
    // Main Method
    static public void Main()
    {
 
        // Creating a dictionary
        // using Dictionary<TKey, TValue> class
        Dictionary<string, string> My_dict =
                    new Dictionary<string, string>();
 
        // Adding key/value pairs in the Dictionary
        // Using Add() method
        My_dict.Add("a.01", "C");
        My_dict.Add("a.02", "C++");
        My_dict.Add("a.03", "C#");
 
        foreach(KeyValuePair<string, string> element in My_dict)
        {
            Console.WriteLine("Key:- {0} and Value:- {1}",
                              element.Key, element.Value);
        }
    }
}

Popularity 10/10 Helpfulness 3/10 Language csharp

Source: www.geeksforgeeks.org

Tags: c# c

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Contributed on Feb 21 2023

ghoulam Mehdi

0 Answers Avg Quality 2/10

c# dictionary

Comment

var dict = new Dictionary<string, string>();
// uses dict.Add(key,value);.....
public void Add (TKey key, TValue value);  
// be carefull first check it doesen't contains key "one"
public void Clear (); 
// remove every thing from dictionary
public bool ContainsKey (TKey key);
// check if key is in the dictionary
public bool ContainsValue (TValue value);  
// check if value is in the dictionary
public int EnsureCapacity (int capacity); 
//Ensures that the dictionary can hold up to a specified number of 
//entries without any further expansion of its backing storage.
public bool Remove (TKey key);
//Removes the value with the specified key 
//but first check it contains that key
public void TrimExcess (int capacity);
//Sets the capacity of this dictionary to hold up a specified number
//of entries without any further expansion of its backing storage.
public bool TryAdd (TKey key, TValue value);
// Attempts to add the specified key and value to the dictionary.
public bool TryGetValue (TKey key, out TValue value);
// Gets the value associated with the specified key.

Popularity 10/10 Helpfulness 2/10 Language csharp

Source: learn.microsoft.com

Tags: c# c

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Contributed on Dec 04 2022

PrashantUnity

0 Answers Avg Quality 2/10

dictionary in c#

Comment

// Creating a Dictionary in C#
Dictionary<string, int> myDictionary = new Dictionary<string, int>();

// Adding key-value pairs to the dictionary
myDictionary.Add("Apple", 1);
myDictionary.Add("Banana", 2);
myDictionary.Add("Orange", 3);

// Accessing values using keys
int appleValue = myDictionary["Apple"];
Console.WriteLine("The value of Apple is: " + appleValue);

// Checking if a key exists in the dictionary
bool isBananaPresent = myDictionary.ContainsKey("Banana");
Console.WriteLine("Is Banana present in the dictionary? " + isBananaPresent);

// Iterating over the dictionary
foreach (KeyValuePair<string, int> kvp in myDictionary)
{
    Console.WriteLine("Key: " + kvp.Key + ", Value: " + kvp.Value);
}

Popularity 9/10 Helpfulness 1/10 Language

Source: Grepper

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Contributed on Sep 12 2023

YOU.com

0 Answers Avg Quality 2/10

c# dictionary

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