Gain insights into creating dynamic web apps with ASP.NET Core MVC. Explore Razor, localization, advanced features, and best practices for building public and business applications.

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In this course, you will learn how to create a modular, dynamic web application with ASP.NET Core MVC, Razor, and Razor tag-helpers. Furthermore, you will also learn how to localize that application in several languages, and finally how to publish it.

You will cover many different aspects of ASP.NET development including: how to optimize user interfaces, validate user input, how to write clean and maintainable code with dependency injection and configuration data, and a whole lot more.

By the end of this course, you will be able to build both a public website and a business application based on ASP.NET Core MVC, with advanced features such as caching, authentication, and authorizations, and while conforming to Microsoft best-practices.

ASP.NET Core MVC

Sometimes there is a duplicated controllers' code that is used to feed the same duplicated Razor markup fragments. 

<span>ASP.</span>NET Core MVC allows developers to factor out all these controller-code / Razor-markup duplicate pairs in entities called `ViewComponents`. Like the controller/view pairs, `ViewComponents` also contain a logical part coded as a standard C# class and a graphic part coded with a Razor view. 

`ViewComponents` may accept parameters passed to the logical part of the ViewComponent that processes them with the help of services coming from the dependency injection engine to fill ViewModels that are passed to views.

As an example of ViewComponent usage, think of a list of products shown in several action methods of several controllers but with all products filtered and sorted in various ways. We may factor out the whole logic for getting the list of products and for displaying them in a ViewComponent that receives both the filtering and sorting conditions as input parameters. 

This way, the various controllers only have to pass filtering and sorting conditions to their views. Their views will then display the list of products with the given filtering and sorting conditions by calling the reusable ViewComponent and passing it the filtering and sorting conditions.

# The logical part of ViewComponents ##

The logical part of a ViewComponent is a class that inherits from  the `ViewComponent` class. It has an `InvokeAsync` method that accepts the component's input parameter as its arguments, as shown in the example below:

In this lesson, we will learn how to factor out entire presentation logic fragments composed of a graphic and a logical part.

Razor Template Language

Razor Language Assessment

Tag Helpers

Tag Helpers Assessment

Controllers and ViewModels

Controllers Assessment

Validation and Metadata

Validation Assessment

Dependency Injection

Configuration and Options Framework

Localization and Globalization

Factoring out UI Logic

Authentication and Authorization

Advanced Topics Assessment

Publishing Your Web Application

Conclusion

Appendix

ViewComponents