ASP

Question 1

HTML Helpers like @Html… are replaced by what in Core

Answer 1

Tag Helpers

Question 2

How do you set up Dependency Injection?

Answer 2

there is a ConfigureServices method in the startup.cs class - this is where DI can be set up. Use the services.AddTransient();

Question 3

There are two special views by default in the Views folder - what are these?

Answer 3

there is a _ViewStart.cshtml file in the main Views folder - anything in this file will be first added to the top of each view when rendered. And there is a _ViewImports.cshtml file in the main Views folder - anything in this file will be added as Imports to all views

Question 4

In Core, which of these can you use: model first, code first, database first

Answer 4

Only code-first

Question 5

Why use a “virtual” property on a model when using Entity Framework?

Answer 5

in EF, virtual on a model property makes this lazy-loaded; you can always remove virtual and make the property eager-loaded

Question 6

Where are connection strings defined in Core?

Answer 6

in core, the connection strings should be in appsettings.json (rather than web.config)

Question 7

Are configuration settings mainly defined in Web.config in ASP.Net Core?

Answer 7

No - the config.json file is generally not used in Core.

Question 8

Where are client-side (static) files defined in an ASP.Net Core app?

Answer 8

In Core, there is a wwwroot folder which should hold all static files (JS, CSS, etc)

Question 9

In a view, how can you conditionally include html when in dev mode?

Answer 9

You can use to include/exclude content in razor views depending on the environment setting

Question 10

How do view components differ from partial views?

Answer 10

View components - like partial views but allows access to data from view; can have more logic; must be used from view ( partial can be used as stand alone view); you create class and a view for the component - so more code oriented

Question 11

What data annotation can you use to specify a property of a model should never be sent back when model is bound in a form?

Answer 11

[BindNever]

Question 12

On a form, how can you add a section to show all input errors together?

Answer 12

Add a div with tag helper of asp-validation-summary=”All”

Question 13

On a form, how can you add a section to show oneinput field’s error?

Answer 13

Add a span or div with tag helper of asp-validation-for=””

Question 14

In which method do you add functions to the ASP pipeline?

Answer 14

In the Configure method of the Startup class.

Question 15

In which method do you defined elements for dependency injection?

Answer 15

In the ConfigureServices method of the Startup class

Question 16

How can you have an action return non-200 status codes?

Answer 16

Actions in controllers can return an IActionResult which includes the http response code. You can use Ok(), NotFound() and BadRequest() to return 200, 400, 404 codes

Question 17

How does an AJAX request specify the data format it would like to get back?

Answer 17

Using the Accept header

Question 18

How does an AJAX request specify the format of the data it is sending?

Answer 18

Using the content-type header

Question 19

What is the term used to describe the process by which a client (AJAX) request asks for one or more return data types and the server decides what type it is able to return?

Answer 19

“Content Negotiation”

Question 20

What are the default rules for whether asp.net parameter binding uses the query string or the post body?

Answer 20

Primitive data types (or types convertible to primitive types) default to using query string binding; non-primitive data types default to using the post body.

To override defaults, use the [fromBody], and [fromUri] parameter annotations

Question 21

What are the three “lifetimes” that can be used with dependency injection?

Answer 21

Transient - every time object is needed

Scoped - once per request

Singleton - once for app

Question 22

How do you create use a “custom validation attribute “?

Answer 22

Create a class which implements IModelValidator. Have the validate method return a list of mode validation errors, or an empty list if all ok. Use as any validation with an attribute on the property in the model class.

Question 23

Can an extension method on a class access private members variables?

Answer 23

No, extension methods turn in to static methods which are called with the first parameter as the instance object - so the extension method is not actually on the class, and looks like an external method - so no access to private members.