ASP. NET MVC Learning Note-2. Controller

In MVC, a controller responds to a request to an ASP. NET MVC site, and each browser request is mapped to a specific controller instance. The controller may do the following for a request: return a specific view to the browser or redirect the request to another controller.

The controller is essentially a class that derives from the controller (System.Web.Mvc.Controller base class).

A public method on a controller called Controlleraction,controlleraction cannot be overloaded and cannot be a static method.

The return value of Controlleraction is called ActionResult, which is the content information that the controller returns in response to a browser request. At present, its types mainly include:

☆viewresult	HTML and Tags (common)
Emptyresult	Any results
Redirectresult	Redirect to new URL
Jsonresult	JavaScript object representation results in AJAX requests
Javascriptresult	JavaScript scripts
Contentresult	Plain Text Results
Filecontentresult	Downloadable files (using binary content)
Filepathresult	The path to the downloadable file
Filestreamresult	Downloadable files (using file streams)

In general, the program does not directly return ActionResult, but instead calls the Controller base class method to return,

View ()	View, return Viewresult
Redirect ()	Redirect, return Redirectresult
Redirecttoaction ()	Back to Redirecttorouteresult
Redirecttoroute ()	Back to Redirecttorouteresult
Json ()	Back to Jsonresult
Javascriptresult ()	Back to Javascriptresult
Content ()	Back to Contentresult
File ()	Returns Filecontentresult, Filepathresult, or Filestreamresult

ASP. NET MVC Learning Note-2. Controller