Question

How to use KeyValuePair to compare a list by key and by value in C#

Answer 1

using System;
using System.Collections.Generic;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static int CompareKey(KeyValuePair<string, int> x, KeyValuePair<string, int> y)
        {
            return x.Key.CompareTo(y.Key);
        }

        static int CompareValue(KeyValuePair<string, int> x, KeyValuePair<string, int> y)
        {
            return x.Value.CompareTo(y.Value);
        }

        static void Main(string[] args)
        {
            var list = new List<KeyValuePair<string, int>>();

            list.Add(new KeyValuePair<string, int>("java", 9));
            list.Add(new KeyValuePair<string, int>("c#", 8));
            list.Add(new KeyValuePair<string, int>("php", 6));
            list.Add(new KeyValuePair<string, int>("python", 7));

            list.Sort(CompareKey);

            foreach (var pair in list)
            {
                Console.WriteLine(pair);
            }
            Console.WriteLine();

            list.Sort(CompareValue);

            foreach (var pair in list)
            {
                Console.WriteLine(pair);
            }
        }
    }
}


/*
run:
     
[c#, 8]
[java, 9]
[php, 6]
[python, 7]

[php, 6]
[python, 7]
[c#, 8]
[java, 9]
 
*/

 

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