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Developed Over Asp.net MVC And Sql

ASP.NET MVC Architecture

Here, you will learn an overview of MVC architecture.

The MVC architectural pattern has existed for a long time in software engineering. All most all the languages use MVC with slight variation, but conceptually it remains the same.

Let's understand the MVC architecture supported in ASP.NET.

MVC stands for Model, View, and Controller. MVC separates an application into three components - Model, View, and Controller.

Model

Model represents the shape of the data. A class in C# is used to describe a model. Model objects store data retrieved from the database.

Model represents the data.

View

View in MVC is a user interface. View display model data to the user and also enables them to modify them. View in ASP.NET MVC is HTML, CSS, and some special syntax (Razor syntax) that makes it easy to communicate with the model and the controller.

View is the User Interface.

Controller

The controller handles the user request. Typically, the user uses the view and raises an HTTP request, which will be handled by the controller. The controller processes the request and returns the appropriate view as a response.

Controller is the request handler.

The following figure illustrates the interaction between Model, View, and Controller.

Setup

• ASP.NET Web Application for Visual C#
• Leave Create directory for solution unchecked.
• Create new Git repository checked.
• Select Empty template.
• Select MVC for Add folders and core references for.

Adding a Controller

• Right click Controllers folder in the project > Add > Class
• Filename for a controller class must end in Controller so Visual Studio can distinguish controllers from regular classes.
• Our controller must inherit from the MVC controller base class and include using System.Web.Mvc
• Controller must be public so its accessible.
• See Controller/ComicBooksController.cs

Adding Action Method

• Methods need to be public so its accessible.
• http://localhost:62466/ComicBooks/Detail via ComicBooksController.cs
• http://localhost:62466/Sarn/Test via Sarn.Controller.cs

    public class ComicBooksController : Controller
    {
        public string Detail()
        {
            return "Hello";
        }
    }

• URL routing is controller/action
• ContentResult, ViewResult, and RedirectResult are a type of action result type.
• Had to modify the return type to ActionResult. In order to find out that was the correct type to return that works for both ContentResult and RedirectResult you can hover over those types and click on F12 (to view the code) or ALT+F12 (to peek the code).

Adding View

• In View folder right click Add > MVC 5 View Page (Razor) to add a view or right click on a controller method.
• You may need to create a folder for each controller and have the view be inside that folder. See View/ComicBooks/Detail.cshtml
• Razor is a view language allowing you to create views by combining C# and HMTL.
• For Razor, you can edit without having to recompile.
• ViewBag is an object built into MVC that allows you to pass data from a controller to a view. See Controller/ComicBooksController.cs
• Using a dynamic type like ViewBag you don't get intellisense in the view when developing using Razor. See strongly typed view below
• ViewBag variables are not case-sensitive.

Add Third Party Files

• Once you add it in the root of the project, you'll need to click on the Show All Files icon to see it in Visual Studios

//generates a link in Razor
@Html.ActionLink("Comic Book Gallery", "Index", "ComicBooks", new { area = "" }, new { @class = "navbar-brand" })

Adding Data Model

• Data modeling is the noun in a website
• Models > ComicBooks.cs

ViewBag.artists = new string[]
{
    "Script: Dan Slott",
    "Pencils: Humberto Ramos",
    "Inks: Victor Olazaba",
    "Colors: Edgar Delgado",
    "Letters: Chris Eliopoulos"
};

• Since the data in artists appears to be the artist and a role, we can break this down into an artist model

    // strongly typed view - by putting object into the view vs. ViewBag.ComicBook = comicBook;
    return View(comicBook);  // will automatically look in the views folder

• Instead of using the ViewBag method, you can make comicBook be a strongly typed view. To make the view strongly typed, go to the view and add @model ComicBookGallery.Models.ComicBook. See Details.cshtml.
• Doing it this way allows the intellisense to work.

// sometimes you need to wrap a Razor statement in parenthesis
@(Model.Favorite ? "Yes" : "No")

• By typing in foreach and then hitting tab twice triggers a prebuilt Visual Studio codesnippet generating

foreach (var item in collection)
{

}

• CTRL + ; = search project.
• constructor can not have a return value and shares the same name as the class name.

// allow nullable
public ActionResult Detail(int? id)

Debugger

• F11 - Step Into
• F10 - Step Over
• Shift + F11 - Step Out