What’s New in ASP.NET Core MVC 2.2?
The ASP.NET Core MVC framework is a lightweight, open source, highly testable presentation framework optimized for use with ASP.NET Core.ASP.NET Core MVC provides a patterns-based way to build dynamic websites that enables a clean separation of concerns. It gives you full control over markup, supports TDD-friendly development and uses the latest web standards.
Features of ASP.NET Core MVC
RoutingASP.NET Core MVC is built on top of ASP.NET Core’s routing, a powerful URL-mapping component that lets you build applications that have comprehensible and searchable URLs. This enables you to define your application’s URL naming patterns that work well for search engine optimization (SEO) and for link generation, without regard for how the files on your web server are organized. You can define your routes using a convenient route template syntax that supports route value constraints, defaults and optional values.Convention-based routing enables you to globally define the URL formats that your application accepts and how each of those formats maps to a specific action method on given controller. When an incoming request is received, the routing engine parses the URL and matches it to one of the defined URL formats, and then calls the associated controller’s action method.
Model bindingASP.NET Core MVC model binding converts client request data (form values, route data, query string parameters, HTTP headers) into objects that the controller can handle. As a result, your controller logic doesn’t have to do the work of figuring out the incoming request data; it simply has the data as parameters to its action methods.
Model validationASP.NET Core MVC supports validation by decorating your model object with data annotation validation attributes. The validation attributes are checked on the client side before values are posted to the server, as well as on the server before the controller action is called.
Dependency injectionASP.NET Core has built-in support for dependency injection (DI). In ASP.NET Core MVC, controllers can request needed services through their constructors, allowing them to follow the Explicit Dependencies Principle.
FiltersFilters help developers encapsulate cross-cutting concerns, like exception handling or authorization. Filters enable running custom pre- and post-processing logic for action methods, and can be configured to run at certain points within the execution pipeline for a given request. Filters can be applied to controllers or actions as attributes (or can be run globally). Several filters (such as
Authorize) are included in the framework.
[Authorize]is the attribute that is used to create MVC authorization filters.
AreasAreas provide a way to partition a large ASP.NET Core MVC Web app into smaller functional groupings. An area is an MVC structure inside an application. In an MVC project, logical components like Model, Controller, and View are kept in different folders, and MVC uses naming conventions to create the relationship between these components. For a large app, it may be advantageous to partition the app into separate high level areas of functionality. For instance, an e-commerce app with multiple business units, such as checkout, billing, and search etc. Each of these units have their own logical component views, controllers, and models.
Web APIsIn addition to being a great platform for building web sites, ASP.NET Core MVC has great support for building Web APIs. You can build services that reach a broad range of clients including browsers and mobile devices.The framework includes support for HTTP content-negotiation with built-in support to format data as JSON or XML. Write custom formatters to add support for your own formats.Use link generation to enable support for hypermedia. Easily enable support for cross-origin resource sharing (CORS) so that your Web APIs can be shared across multiple Web applications.
TestabilityThe framework’s use of interfaces and dependency injection make it well-suited to unit testing, and the framework includes features (like a TestHost and InMemory provider for Entity Framework) that make integration tests quick and easy as well.
Strongly typed viewsRazor views in MVC can be strongly typed based on your model. Controllers can pass a strongly typed model to views enabling your views to have type checking and IntelliSense support.
Tag HelpersTag Helpers enable server side code to participate in creating and rendering HTML elements in Razor files. You can use tag helpers to define custom tags (for example,
<environment>) or to modify the behavior of existing tags (for example,
<label>). Tag Helpers bind to specific elements based on the element name and its attributes. They provide the benefits of server-side rendering while still preserving an HTML editing experience.
View ComponentsView Components allow you to package rendering logic and reuse it throughout the application. They’re similar to partial views, but with associated logic.
Razor view engineASP.NET Core MVC views use the Razor view engine to render views. Razor is a compact, expressive and fluid template markup language for defining views using embedded C# code. Razor is used to dynamically generate web content on the server. You can cleanly mix server code with client side content and code.
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