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It is an attribute that can be applied in the controller. It tell that which the action execution is done. Action Filters are additional attributes that can be applied to either a controller section or the entire controller to modify the way in which action is executed. It is derivied from System.Attribute.
There are four type of filter that support asp.net MVC
1-Authorization filter – It implements IAuthorization attribute. It contain the logic for authentication for controller action.
2-Action Filter- It implements IActionFilter attribute. It contain the logic that is executed before and after control action executes.
3-Result Filter-It implements IResult attribute. It contain the logic that is executed before and after the view result execution.
4-Exeception Filter-It implants IException attribute. It contain the logic for handle error it executes at the last of all filter.