MVC ppt presentation
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The document provides an overview of ASP.NET MVC, including its core components and how they differ from ASP.NET Web Forms. It discusses Models, Views, Controllers, validation, routing, unit testing, and view engines. Key points covered include MVC separating application logic, control over HTML, testability, and no viewstate or postbacks. Examples are provided for creating controllers and actions, passing data to views, validation, routing, and unit testing.
![Pass Data to a View
With ViewData:
ViewData["message"] = "Hello World!";
Strongly typed ViewData:
− ViewData.Model = OurModel;
With ViewBag:
ViewBag.Message = "Hello World!";
18](https://image.slidesharecdn.com/asp-150729070333-lva1-app6892/85/MVC-ppt-presentation-18-320.jpg)
![Post data to a controller
Verb Attributes
The action method in the controller accepts the
values posted from the view.
The view form fields must match the same
names in the controller.
19
[HttpPost]
public ActionResult Edit(Movie movie)
{
if (ModelState.IsValid)
{
db.Entry(movie).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(movie);
}](https://image.slidesharecdn.com/asp-150729070333-lva1-app6892/85/MVC-ppt-presentation-19-320.jpg)
MVC ppt presentation
- 1. ASP.NET MVC Bhavin Shah Software Engineer @ Sfw India Pvt. Ltd .
- 2. Agenda Beforehand – ASP.NET Web Forms What is MVC What is ASP.NET MVC? Models Views Controllers Validation Routing Unit Tests View engines 2
- 3. ASP.NET Web Forms Rich controls and tools Postbacks Event driven web development Viewstate Less control over the HTML Hard to test Rapid development 3
- 4. Let’s chat for a bit… 4
- 6. Model – View - Controller 6 Controller - responsible for handling all user input Model - represents the logic of the application View - the visual representation of the model
- 7. ASP.NET MVC More control over HTML No Codebehind Separation of concerns Easy to test URL routing No postbacks No ViewState 7
- 8. Models The model should contain all of the application business logic, validation logic, and database access logic. ASP.NET MVC is compatible with any data access technology (for example LINQ to SQL) All .edmx files, .dbml files etc. are located in the Models folder. 8
- 9. Custom View Models 9 When you combine properties to display on a View namespace ContosoUniversity.ViewModels { public class AssignedCourseData { public int CourseID { get; set; } public string Title { get; set; } public bool Assigned { get; set; } } }
- 10. Creating a Model - DEMO 10
- 11. What is Controller? It is a class Derives from the base System.Web.Mvc.Controller class Generates the response to the browser request 11 public class HomeController : Controller { public ActionResult Index() { ViewBag.Message = "Welcome to ASP.NET MVC!"; return View(); } public ActionResult About() { return View(); } }
- 12. Controller Actions Public method of the Controller class Cannot be overloaded Cannot be a static method Returns action result 12 public ActionResult About() { return View(); }
- 13. Action Results Controller action response to a browser request Inherits from the base ActionResult class Different results types 13
- 14. Implement a Controller - DEMO 14
- 17. Views Most of the Controller Actions return views The path to the view is inferred from the name of the controller and the name of the controller action. ViewsControllerNameControllerAction.aspx A view is a standard (X)HTML document that can contain scripts. script delimiters <% and %> in the views 17
- 18. Pass Data to a View With ViewData: ViewData["message"] = "Hello World!"; Strongly typed ViewData: − ViewData.Model = OurModel; With ViewBag: ViewBag.Message = "Hello World!"; 18
- 19. Post data to a controller Verb Attributes The action method in the controller accepts the values posted from the view. The view form fields must match the same names in the controller. 19 [HttpPost] public ActionResult Edit(Movie movie) { if (ModelState.IsValid) { db.Entry(movie).State = EntityState.Modified; db.SaveChanges(); return RedirectToAction("Index"); } return View(movie); }
- 20. Explore a View - DEMO 20
- 21. HTML Helpers Methods which typically return string. Used to generate standard HTML elements textboxes, dropdown lists, links etc. Example: Html.TextBox() method Usage is optional You can create your own HTML Helpers 21
- 22. Validation Two types of validation error messages generated before the HTML form fields are bound to a class generated after the form fields are bound to the class Model State Validation Helpers Html.ValidationMessage() Html.ValidationSummary() 22 ventsypopov.com
- 24. Routing The Routing module is responsible for mapping incoming browser requests to particular MVC controller actions. Two places to setup: Web.config file Global.asax file 24
- 25. Routing Setup Web.config file 25 <system.web> <httpModules> … <system.web> <httpHandlers> … <system.webServer> <modules> … <system.webServer> <handlers> …
- 26. Routing Setup Global.asax file 26 public class MvcApplication : System.Web.HttpApplication { public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( "Default", "{controller}/{action}/{id}", new { controller = "Home", action = "Index", id = "" } ); } protected void Application_Start() { RegisterRoutes(RouteTable.Routes); } }
- 27. URL Example http://www.mysite.com/Home/About/6 {controller} = Home {action} = About {id} = 6 27 ventsypopov.com
- 28. Routing example - DEMO 28 ventsypopov.com
- 29. Unit Tests Used for the business logic (not DAL or View logic). Test individual “unit”of code Make the code safe to modify Mock Object framework When you lack “real” objects Create mocks for the classes in the application Test with mock objects 29
- 30. Unit Tests - DEMO 30 ventsypopov.com
- 31. View Engines Handles the rendering of the view to UI (html/xml); Different view engines have different syntax ASP.NET MVC 3 Pre-included View Engines: Web Forms Razor 31
- 32. View Engines - DEMO 32
- 33. Things to remember What MVC stands for How ASP.NET MVC differs from Web Forms Where is routing configured How to validate business logic How to use helpers Unit tests basics Choice between “View Engines” 33
- 36. Time to wake up :) 36
Editor's Notes
- #6: Анализ при архитектурни решения – взимаме стратегически решения свързани с бизнес нуждите на системата, която изграждаме. Обмисляме сигурност, производителност, поддръжка, надеждност, интеграция с тестови приложения, леснота и удобство на употреба на системата. Проблеми, с които се сблъскваме: Честа смяна на потребителски интерфейс Различно представяне на едни и същи данни Работа върху различни устройства Улеснено модулно тестване на системата Как да ги решаваме: Независимост на отделните модули Преизползваемост на модулите Добра структурна организация на системата
- #16: Viewresult - If you want an action method to result in a rendered view, the action method should return a call to the controller&apos;s View helper method. The View helper method passes a ViewResult object to the ASP.NET MVC framework, which calls the object&apos;s ExecuteResult method. JsonResult - Represents a class that is used to send JSON-formatted content to the response. JavaScriptResult - Sends JavaScript content to the response. ContentResult - Represents a user-defined content type that is the result of an action method. FileContntResult - Represents a class that is used to send binary file content to the response FileStreamResult - Sends binary content to the response by using a Stream instance. FilePathResult - Sends the contents of a file to the response
- #17: View - Creates a ViewResult object that renders a view to the response. Redirect - Creates a RedirectResult object that redirects to the specified URL. RedirectToAction - Redirects to the specified action using the action name Json - Creates a JsonResult object that serializes the specified object to JavaScript Object Notation (JSON) format. JavaScript - Creates a JavaScriptResult object Content - Creates a content result object by using a string. File - Creates a FileContentResult object by using the file contents and file type.
- #22: To create HTML helper – a class with public static string methods and refer the namespace in the view.
- #23: Html.ValidationMessage() - Displays a validation message if an error exists for the specified field in the ModelStateDictionary object Html.ValidationSummary() - Returns an unordered list (ul element) of validation messages that are in the ModelStateDictionary object.