Introduction to ASP. NET MVC

1 what is ASP. NET MVC?

ASP. NET MVC is the official Microsoft-provided MVC-based Web application (Web application) framework, which is castle by monorail, and the latest version is ASP. NET MVC 4.0. is to decompose a Web application into: Model, view, and controller. The ASP. NET MVC Framework provides an MVC-based design pattern that can be used in place of ASP. WebForm.

Advantages of MVC:

(1), by dividing the project into model, view and controller, make complex projects easier to maintain, reduce the coupling between projects;

(2), do not use ViewState and server form control, you can more easily control the behavior of the application;

(3), the application through the controller to control the request, and provides the native urlrouting function to rewrite the URL;

(4), so that the Web program support for unit testing better;

(5), in the team development model performance more outstanding.

2. MVC contains key technologies:

return type of Actionresult:action

Filter: Filters

Modelbinder:model binding Device

URL Routing:url Routing Rules

3. The implementation phase of the MVC Web project:

Stage	More information
Receive the first request to an application	In the Global.asax file, the Route object is added to the RouteTable object.
Executing a route	The UrlRoutingModule module uses the first matching Route object in the RouteTable collection to create the Routedata object, and then creates the RequestContext object with the created object
Create an MVC request handler	The Mvcroutehandler object creates an instance of the Mvchandler class and passes the RequestContext instance to the handler
Create a Controller	The Mvchandler object uses the RequestContext instance to identify the Icontrollerfactory object that is used to create the controller instance (typically an instance of the Defaultcontrollerfactory class)
Execution controller	Mvchandler instance calls the controller's Execute method
Invoke operation	For a controller that inherits from the Controllerbase class, the Controlleractioninvoker object associated with the controller determines the action method to invoke the Controller class, and then calls the method
Execution results	The action method receives the user input, prepares the appropriate response data, and then executes the result by returning the result type. The built-in result types that are executable include: ViewResult (renders view and is the most commonly used result type), Redirecttorouteresult, Redirectresult, Contentresult, Jsonresult, Fileresult and Emptyresult

A simple description:

Step 1: Create the RouteTable

The first step occurs when the ASP. NET application starts for the first time. RouteTable maps the URL to handler.

Step 2:urlroutingmodule Intercept Request

The second step occurs when we initiate the request. UrlRoutingModule intercepts each request and creates and executes the appropriate handler.

Step 3: Execute Mvchandler

Mvchandler creates the controller and passes the controller in to ControllerContext, then executes the controller.

Step 4: Execute the Controller

The controller detects the Controller method to be executed, constructs the parameter list, and executes the method.

Step 5: Call the Renderview method

In most cases, the Controller method calls Renderview () to render the content back to the browser. The Controller.renderview () method delegates the work to a viewengine.

Introduction to ASP. NET MVC