Pattern: Factory

Description

A factory is a function or method that returns objects of a varying prototype or class from some method call, which is assumed to be new

Example in .NET :

Factory

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using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Controllers;
using Microsoft.AspNetCore.Mvc.Internal;
using System.Data.Common;
using System.Globalization;
using System.Net;
using System.Web.Mvc;
 
namespace Factory;
internal class FactoryDemo
{
    public static void DemoWebRequest()
    {
        HttpWebRequest hwr = (HttpWebRequest)WebRequest.Create("http://www.yahoo.com");
 
    }
    public static void DemoConvert()
    {
        string value = "1,500";
        Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture("en-US");
 
        Console.WriteLine(Convert.ToDouble(value));
 
        Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture("fr-FR");
        Console.WriteLine(Convert.ToDouble(value));
 
    }
    static void RegisterControllerFactory()
    {
        ControllerBuilder.Current.SetControllerFactory(new MyControllerFactory());
    }
}
 
//default controller factory is a factory of controllers
class MyControllerFactory : System.Web.Mvc.DefaultControllerFactory
{
 
    public override IController CreateController(System.Web.Routing.RequestContext requestContext, string controllerName)
    {
        if (controllerName == "andrei")
            return null;//maybe controller not found
 
        return base.CreateController(requestContext, controllerName);
    }
}
    

Learn More

Wikipedia

Homework

having multiple types of drinks( water, tea, coffee) with an IDrink interface create a factory method ( with a parameter ) to create a drink