Dictionary C# get value by key code example

Example 1: c# dictionary get value by key

Dictionary<string, string> dict = new Dictionary<string, string>();
 dict.Add("UserID", "test");
 string userIDFromDictionaryByKey = dict["UserID"];

Example 2: access dic by key c#

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Dictionary<string, int> dictionary = new Dictionary<string, int>();

        dictionary.Add("apple", 1);
        dictionary.Add("windows", 5);

        // See whether Dictionary contains this string.
        if (dictionary.ContainsKey("apple"))
        {
            int value = dictionary["apple"];
            Console.WriteLine(value);
        }

        // See whether it contains this string.
        if (!dictionary.ContainsKey("acorn"))
        {
            Console.WriteLine(false);
        }
    }
}

Example 3: dictionary c# get key by value

var myKey = types.FirstOrDefault(x => x.Value == "one").Key;

Example 4: c# dictionaries

IDictionary<int, string> dict = new Dictionary<int, string>();
        
//or

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

Example 5: c sharp add item to dictionary

// To add an item to a dictionary use 'Add()'
dict.Add(1,"One");