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Models: Model objects are the parts of the application that implement the logic for the application’s data domain. Often, model objects retrieve and store model state in a database. For example, a Product object might retrieve information from a database, operate on it, and then write updated information back to a Products table in SQL Server.
Views: Views are the components that display the application’s user interface(UI). Typically, this UI is created from the model data. An example would be an edit view of a Products table that displays text boxes, drop-down lists, and check boxes based on the current state of a Products object.
Controllers: Controllers are the components that handle user interaction, work with the model, and ultimately select a view to render that displays UI. In an MVC application, the view only displays information; the controller handles and responds to user input and interaction. For example, the controller handles query-string values, and passes these values to the model, which in turn queries the database by using the values.
MVC & ASP.NET Web Forms You must consider carefully whether to implement a Web application by using either the ASP.NET MVC framework or the ASP.NET Web Forms model. The MVC framework does not replace the Web Forms model; you can use either framework for Web applications.(If you have existing Web Form-based applications, these continue to work exactly as they always have.)
Features of the ASP.NET MVC Framework The ASP.NET MVC framework provides the following features: l Separtion of application tasks(input logic, business logic and UI logic), testability, and test-driven development(TDD) by default. All core contracts in the MVC framework are interface-based and can be tested by using mock objects, which are simulated objects that imitate the behavior of actual objects in the application. You can unit-test the application without having to run the controllers in an ASP.NET process, which makes unit testing fast and flexible. You can use any unit-testing framework that is compatible with the .NET Framework. l An extensible and pluggable framework. The components of the ASP.NET MVC framework are designed so that they can be easily replaced or customized. You can plug in your own view engine, URL routing policy, action-method parameter serialization, and other components. You can plug in your own view engine, URL routing policy, action-method parameter serialization, and other components. The ASP.NET MVC framework also supports the use of Dependency Injection(DI) and Inversion of Control(IOC) container models. DI allows you to inject objects into a class , instead of relying on the class to create the object it self. IOC specifies that if an object requires another object, the first objects should get the second object from an outside source such as a configuration file. This makes testing easier. l A powerful URL-mapping component that lets you build applications that have comprehensible and searchable URLs. URLs do not have to include file-name extensions, and are designed to support URL naming patterns that work well for search engine optimization(SEO) and representational state transfer(REST) addressing. l Support for using the markup in existing ASP.NET page (.aspx files), user control(.ascx files), and master page(.master files) markup files as view templates. You can use existing ASP.NET features with the ASP.NET MVC framework, such as nested master pages, in-line expression(<%=%>),declarative server controls, templates,data-bingding, localization, and so on. l Support for existing ASP.NET features. ASP.NET MVC lets you use features such as forms authentication and Window authentication, URL authorization, membership and roles, output and data caching, session and profile state management, health monitoring, the configuration system, and the provider architecture.
参考：MSDN MVC部分 |
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