Web Programming using .NET Unit 2

Questions and Answers

What is the purpose of controller-specific folders in an ASP.NET Core MVC application?

To keep all view files in a single folder for easy access.

To store all view files for the application.

To separate view files from controller logic.

To group view files specific to each controller. (correct)

Which of the following statements about action methods in a controller is correct?

Action methods cannot share the same name within a single controller.

View names must be specified when they differ from action method names. (correct)

Action method names must always be unique across all controllers.

View file names can match action method names without any requirement.

Where are controller classes typically found in an ASP.NET Core MVC application?

In the Views folder.

In the Controllers folder. (correct)

In the Services folder.

In the Models folder.

What must a controller class inherit from in an ASP.NET Core MVC application?

Controller. Signup and view all the answers

How do controllers help in organizing actions within an MVC application?

By grouping similar types of actions together. Signup and view all the answers

What process occurs when a client sends a request to the server in an ASP.NET Core MVC application?

The request goes through the request processing pipeline. Signup and view all the answers

Which action methods are included in the provided HomeController example?

AboutUs(), ContactUs(), Index(). Signup and view all the answers

What action methods are available in the StudentController example?

Index(), Details(), Edit(), Delete(). Signup and view all the answers

What is the primary function of the action methods within a controller?

To handle HTTP requests and prepare responses. Signup and view all the answers

What occurs after a request passes through the request processing pipeline?

It hits the controller. Signup and view all the answers

What is the role of the Routing Engine in the context of a controller?

To determine the action method to call based on the HTTP request. Signup and view all the answers

Which of the following is NOT a responsibility of a controller in the MVC pattern?

Accessing data from the database. Signup and view all the answers

How can attributes be applied in the context of an ASP.NET Core controller?

At both the controller and action method levels. Signup and view all the answers

What is a key characteristic of a model in an ASP.NET Core application?

It contains the business logic of the application. Signup and view all the answers

What is the initial step to add a controller in an ASP.NET Core project?

Select the 'Add Controller' option from the context menu. Signup and view all the answers

Which statement best describes the environmental responsibility of a controller in MVC?

To group related action methods and process requests. Signup and view all the answers

What is the main purpose of action methods in a controller?

To return HTTP responses Signup and view all the answers

Which return type do action methods typically use?

ActionResult Signup and view all the answers

Which attribute is used to designate a method as a non-action method?

[NonAction] Signup and view all the answers

Which of the following correctly defines the action methods in relation to user requests?

They are associated with URLs. Signup and view all the answers

What kind of methods are used for shared functionality among action methods?

Non-action methods Signup and view all the answers

Which type of HTTP request could an action method handle?

Various request types including GET, POST, PUT, DELETE Signup and view all the answers

Which of the following statements about non-action methods is true?

They are used to encapsulate common logic. Signup and view all the answers

Which return type is not commonly associated with action methods?

StringResult Signup and view all the answers

What cannot be directly accessed via a URL in ASP.NET Core?

Action methods returning IActionResult Signup and view all the answers

Which result type is NOT derived from ActionResult?

StreamResult Signup and view all the answers

What is the purpose of the View method in ASP.NET Core?

To define a model that is transferred to the view Signup and view all the answers

What does View() method with an empty parameter do?

Targets the default view to render it Signup and view all the answers

When using View(model), what is the benefit of providing a model?

It makes the rendered view strongly typed Signup and view all the answers

What is a characteristic of ViewResult objects in ASP.NET Core?

They represent an HTML view template for web browsers. Signup and view all the answers

Which overloaded version of View() takes a view name as a parameter?

View(viewName) Signup and view all the answers

What do the different overloads of the View() method facilitate?

Rendering different views and handling models Signup and view all the answers

What does the StatusCodeResult object represent?

An HTTP status code without a specific content response Signup and view all the answers

Which class is described as the parent class of all file-related action results?

FileResult Signup and view all the answers

What is the primary use of the RedirectResult class in ASP.NET MVC Core?

To instruct the user's browser to navigate to a different URL Signup and view all the answers

Which HTTP status code is sent by default when using RedirectResult?

302 (Found) Signup and view all the answers

In which situation would a RedirectResult be particularly useful?

After a form submission to direct the user to a confirmation page Signup and view all the answers

What type of content can the FileResult class send to the client?

Binary file content Signup and view all the answers

Which scenario would not typically require the use of RedirectResult?

Displaying a downloaded file Signup and view all the answers

Which response type is typically returned when using the StatusCodeResult object?

HTTP status code like 404 or 500 Signup and view all the answers

Study Notes

Controller Folders and Views

Each controller has a dedicated folder within the Views folder for storing controller-specific view files.
View file names can match the action method names of the controller; if they differ, the view name must be specified.

Example Controllers

ASP.NET Core MVC applications can have multiple controllers, e.g., HomeController with action methods AboutUs(), ContactUs(), and Index().
Another example is StudentController with action methods Index(), Details(), Edit(), and Delete().

Controller Overview

Controllers are special classes in ASP.NET Core with a .cs extension, residing in the Controllers folder by default.
Controllers must inherit from the Controller base class.
They logically group similar action methods, allowing common features like caching, routing, and authorization to be applied collectively.

Request Processing

Client requests are processed through a request processing pipeline before reaching the controller.
Inside the controller, action methods handle incoming HTTP requests, executing the business logic and preparing the response.

Adding Controllers

New controllers are added by right-clicking the Controllers folder and selecting Add => Controller, typically using an Empty template.

Role of Controllers

Controllers group action methods and handle incoming HTTP requests and responses.
Mapping of requests to action methods is managed by a routing engine.
Controllers can have applied attributes for features like routing, caching, and security.

Model Definition

Models encapsulate the business logic of an application and facilitate data access from databases.
They do not directly handle browser input or contain HTML code.

Action Methods

Action methods manage HTTP requests and return HTTP responses, corresponding to specific URLs.
Typically return an ActionResult or derived types (e.g., ViewResult, JsonResult).
Action methods are public.

Non-Action Methods

Non-action methods are regular methods that aren’t entry points for handling HTTP requests.
Marked with the [NonAction] attribute, these methods support action methods without being accessible via URL.

IActionResult Object

IActionResult includes various result types derived from ActionResult, including ViewResult, JsonResult, ContentResult, StatusCodeResult, FileResult, and RedirectResult.

ViewResult Object

ViewResult represents HTML templates ready to be rendered as responses.
The View() method can be overloaded for different uses, such as targeting default views or using specific view names and models.

StatusCodeResult Object

Represents an HTTP status code without a content response, useful for 404 (Not Found), 500 (Internal Server Error), etc.

FileResult Object

Used for returning files from controller actions, supporting file downloads or inline display.
Serves as the parent class for all file-related action results.

RedirectResult

RedirectResult instructs a browser to navigate to a different URL, with common uses like redirecting after form submissions or login successes.
By default, it sends a 302 (Found) HTTP status code for temporary redirects.

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Description

This quiz focuses on Unit 2 of the Web Programming using .NET course, covering the organization of controller-specific view files in ASP.NET Core. It emphasizes the structure within the Views folder and naming conventions for view files that correspond to action methods in controllers.