DictionaryApp

using System;
using System.Collections.Generic;

namespace Everything
{
    class Program
    {
        //method for getting integers and avoid exceptions
        private static void input(ref int a, ref bool c)
        {
            while (c)//if c = true then it was not the intinput
            {
                try
                {
                    c = false;//if every thing c = false and it goes out from loop
                    a = Convert.ToInt32(Console.ReadLine());
                }
                catch (Exception)
                {
                    c = true;//if there was an exeption (str iput) c = true and the loop continues
                    Console.WriteLine("Your input was incorrect");//tels to user that hi was misstaken
                    Console.WriteLine("Try once more");
                }
            }
            c = true;//at th end c = true
        }

        //method just wtites a command list
        private static void commandsReminder()
        {
            Console.WriteLine("1 - Add a key and value");
            Console.WriteLine("2 - Delete a key value pair");
            Console.WriteLine("3 - Find a key or value");
            Console.WriteLine("4 - Print all pairs");
            Console.WriteLine("5 - Terminate the proces");
        }

        //asks user to give a key and a value for pair (1)
        private static void addAKeyValuePair(ref Dictionary<int, string> dictionary, ref bool checker)
        {
            Console.WriteLine("Add a key value pair: ");
            Console.WriteLine(new string('-', 50));
            int key = 0;
            string value = "";
            checker = true;
            Console.WriteLine("Give a key (int)");
            input(ref key, ref checker);//the key shoul be int

            if (!dictionary.ContainsKey(key))//if there was no such key every thing is OK and we add a pair and tell to user that pair was added
            {
                Console.WriteLine("Give a value (string)");
                value = Console.ReadLine();
                dictionary.Add(key, value);
                Console.WriteLine("{2}\nKey = {0}, value = {1}\nWas added\n{2}", key, dictionary[key], new string('-', 50));
                Console.Write("Press any key");
                Console.ReadKey();
                Console.WriteLine();
            }
            else//if key existed we tell to user about it and finish the proces
            {
                Console.WriteLine("This key is already exists");
                Console.Write("Press any key");
                Console.ReadKey();
                Console.WriteLine();
            }

        }

        //gets a key and delets the pair with its key
        private static void removeAKeyValuePair(ref Dictionary<int, string> dictionary, ref bool checker)
        {
            if (dictionary.Count == 0)
                Console.WriteLine("There is no key value pairs");
            else
            {
                Console.WriteLine("Remove a pair");
                Console.WriteLine(new string('-', 50));
                int key = 0;
                Console.WriteLine("Give a key of pair you want to delete");
                input(ref key, ref checker);
                if (dictionary.ContainsKey(key))
                {
                    Console.WriteLine("{2}\nKey = {0}, value = {1}\nWas deleted\n{2}", key, dictionary[key], new string('-', 50));
                    Console.Write("Press any key");
                    dictionary.Remove(key);
                    Console.ReadKey();
                    Console.WriteLine();
                }
                else
                {
                    Console.WriteLine("There is no such key");
                    Console.Write("Press any key");
                    Console.ReadKey();
                    Console.WriteLine();
                }
            }
        }

        //returns the value if the key exists
        private static void findKeyValuePair(ref Dictionary<int, string> dictionary, ref bool checker)
        {
            if (dictionary.Count == 0)
                Console.WriteLine("There is no key value pairs");
            else
            {
                Console.WriteLine("Find a value by key");
                Console.WriteLine(new string('-', 50));
                int key = 0;
                string value;
                Console.WriteLine("Input the key you are looking for");
                input(ref key, ref checker);
                if (dictionary.TryGetValue(key, out value))
                {
                    Console.WriteLine("{1}\nValue = {0}\nWas found\n{1}", value, new string('-', 50));
                    Console.Write("Press any key");
                    Console.ReadKey();
                    Console.WriteLine();
                }
                else
                {
                    Console.WriteLine("The key is not found");
                    Console.Write("Press any key");
                    Console.ReadKey();
                    Console.WriteLine();
                }
            }
        }

        //prinst all pairs which exists
        private static void printDictionary(Dictionary<int, string> d)
        {
            if (d.Count == 0)
                Console.WriteLine("There is no key value pairs");
            else
            {
                Console.WriteLine("Print all pairs");
                Console.WriteLine(new string('-', 50));
                foreach (KeyValuePair<int, string> p in d)
                {
                    Console.WriteLine("Key = {0}, value = {1}", p.Key, p.Value);
                }
                Console.WriteLine(new string('-', 50));
                Console.Write("Press any key");
                Console.ReadKey();
                Console.WriteLine();
            }
        }

        static void Main()
        {
            Dictionary<int, string> dictionary = new Dictionary<int, string>();
            int command = 0;
            bool mainChecker = true;
            Console.WriteLine("Hello, this is a Key Value Pair.");
            Console.WriteLine("To make your life easier each command will be just a number-key");
            Console.WriteLine("So, now you have an empty Key Value Pair, what do you want to do?");
            commandsReminder();
            Console.WriteLine(new string('=', 50));
            do
            {
                input(ref command, ref mainChecker);
                switch (command)
                {
                    case 1:
                        addAKeyValuePair(ref dictionary, ref mainChecker);
                        break;
                    case 2:
                        removeAKeyValuePair(ref dictionary, ref mainChecker);
                        break;
                    case 3:
                        findKeyValuePair(ref dictionary, ref mainChecker);
                        break;
                    case 4:
                        printDictionary(dictionary);
                        break;
                    case 5:
                        break;
                    default:
                        Console.WriteLine("You have no such command");
                        break;
                }
                Console.WriteLine(new string('=', 50));

                //check if user what to exit, he'll not get a reminder
                if (command != 5)
                {
                    commandsReminder();
                    Console.WriteLine("What's next?");
                }
            } while (command != 5); //goes out of loop
            Console.WriteLine("Good bey");
            Console.Write("Press any key");
            Console.ReadKey();
        }
    }
}