DOT NET developer blog: Design Pattern - Behavioral

Scenario:

Create a Currency Helper to add the currency symbol based on country

Solution:

Behavioral Pattern is used to select an algorithm at runtime by dynamic parameter for example.

Example: Create a Currency Helper to add the currency symbol based on country

public interface ICurrencyStrategy

{
    string ToCurrency(long value);
}

public static class CurrencyCodes
{
    public const string USD = "$";
    public const string INR = "₹";
}

public class USCurrencyStrategy : ICurrencyStrategy
{
    public string ToCurrency(long value)
    {
        return $"{CurrencyCodes.USD} {value}";
    }
}

public class IndiaCurrencyStrategy : ICurrencyStrategy
{
    public string ToCurrency(long value)
    {
        return $"{CurrencyCodes.INR} {value}";
    }
}

public class Currency
{
    public long Value { get; set; }

    public Currency(long value)
    {
        Value = value;
    }

    public string ToCurrency()
    {
        ICurrencyStrategy currencyStrategy = ResolveStrategyByCountry();
        return currencyStrategy.ToCurrency(Value);
    }

    private ICurrencyStrategy ResolveStrategyByCountry()
    {
        if (CultureInfo.CurrentCulture.Name == "en-US")
        {
            return new USCurrencyStrategy();
        }

        if (CultureInfo.CurrentCulture.Name == "en-IN")
        {
            return new IndiaCurrencyStrategy();
        }

        return null;
}

    public class StrategyPattern
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter key U for US or I for India");

            var key = Console.ReadKey();

            switch (key.Key)
            {
                case ConsoleKey.U:
                    System.Threading.Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
                    break;
                case ConsoleKey.I:
                    System.Threading.Thread.CurrentThread.CurrentCulture = new CultureInfo("en-IN");
                    break;
            }

            var price = new Currency(44);

            Console.WriteLine($"{price.ToCurrency()}");
        }
    }

DOT NET developer blog

Design Pattern - Behavioral - Strategy

Scenario:

Solution:

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