Basic .Net MVC questions

Question 1

What is dependency Inhjection?

Answer 1

DI is a process of injecting the dependent objects(classes) to a class instead of class creating the dependent object.

For example, in controller class, we inject the AppDBContext. If we create the DBContext in the controller class, then it will be tightly coupled. If we create a new AppDBContext later, then we have to change it in all controllers.

Question 2

Why do we need DI?

Answer 2

To build loosely coupled sstems.

Question 3

How do we do model validation?

Answer 3

TBD

Question 4

What is Razor?

Answer 4

Razor is a view engine which helps us to write a server side code and the C# code inside the view.

Question 5

What are strongly types views?

Answer 5

They are razor views where we get Model intellisense. This avoids errors.

Question 6

What is a View Model?

Answer 6

View Model is a wrapper class around the multiple models that are required for the view.

Question 7

Explain kestrel web server ?

Answer 7

Kestrel is a default web server which comes with asp .Net core.

Question 8

Why kestrel web server when we have IIS ? .

Answer 8

ASP .Net Core is a cross-platform. But IIS is a windows specific. IIS wont work in non-WIndows platform

Question 9

Does Kestrel replace IIS?

Answer 9

No, we use Reverse Proxy server.

Question 10

What is Reverse Proxy server?

Answer 10

In Reverse Proxy server, The request from the user goes to the IIS or Apache whihc redirects it to the Kestrel.

Question 11

What is ASP.NET MVC Core ?

Answer 11

It is cross plafform and high performance framework to develop web applications.

Question 12

Can you explain the difference between MVC core vs MVC 5 vs Webforms?

Answer 12

There are many differences:

a. MVC core is a cross-platform.
b. MVC core has built0in DI.
c. MVC code has appsettings.json
d. MC Core has high performace.
e. static files are grouped under wwwroot.

Question 13

Explain MVC?

Answer 13

In MVC, our projects are divided into three layers:

a. Model: The data for the view.
b. View: the UI.
c. THe coontroller whihc binds the Model and the view.

Question 14

What is the importance of wwwroot?

Answer 14

It stores static files such as HTML CSS and JS.

Question 15

Where do we store configuration in ASP.NET Core ?

Answer 15

appsettings.json. It is a simple file in JSON format. With name and value pair. configurations such as Connection strings are stored here.

Question 16

How can we read configuration file in ASP.NET Core ?

Answer 16

We need to use IConfiguration.

CustomerCOntroller(IConfiguration config)
{
config[“connectonString”];
}

A readmade configuration will be DI to the controller.

For multi level, config[“level1:level2”]