asp.net MVC Note Action filter

The action filter is embodied in the Code as a property added to the action, and the MVC framework contains filters such as:

outputcache– instructs the controller to cache the returned results within a specified time.

handleerror– handles exceptions thrown by action in Contrller

authorize– constrain the access of a specific user or role to an action

Using the action filter

The action filter can control not only individual action, but also the entire contrller. At the same time, one action can apply multiple filters. Like what:

This action returns the current time, but if you refresh the interface within 10 seconds, you will always get the same value, because OutputCache (duration=10) is used here.

Type of filter

The ASP.net MVC Framework supports the following types of filters:
1. Authorization Filter-implements the Iauthorizationfilter interface. This type of filter is used to implement user authentication and access authorization to the action. For example, authorize belongs to the authorization filter.
2. Action Filter-implements the Iactionfilter interface. It can contain some logic before or after the action is executed, for example, some filters are specifically used to modify the data returned by the action.
3. Result filter-implements the Iresultfilter interface. It can contain some logic before the view result is generated or generated, such as some filters designed to modify the results of a view before it is presented to the browser.
4. Exception Filter-implements the Iexceptionfilter interface. It is used to process action or result errors, or to log errors.
The filter's default order of execution is the same as the list above, for example, the authorization filter executes before the action filter, and the exception filter is always executed at the end. Of course, you can also set the order of the filter execution according to your needs.