功能:MVC提供过滤器Filter,使开发者不用复杂的实现AOP而直接用Filter实现同样的功能.
实现:1.定义一个类实现ActionFilterAttribute,重载借口中的方法后在Controller或者Action上加上该特性即可
2.若是每个Action都要实现,则可以在全局文件中,在注册过滤器"RegisterGlobalFilters(GlobalFilters.Filters);"之前使用GlobalFilters.Filters.Add方法加入定义好的过滤对象的实现
例子:
1.先定义过滤器类
[AttributeUsage(AttributeTargets.All,AllowMultiple=true)]//此属性让他可以执行多次 public class DemoActionAttributeFileter : ActionFilterAttribute { public string strMsg { get; set; } public override void OnActionExecuting(ActionExecutingContext filterContext) { filterContext.HttpContext.Response.Write("<script>alert(‘执行之前:"+strMsg+"‘)</script>"); base.OnActionExecuting(filterContext); } public override void OnActionExecuted(ActionExecutedContext filterContext) { filterContext.HttpContext.Response.Write("<script>alert(‘执行之后:" + strMsg + "‘)</script>"); base.OnActionExecuted(filterContext); } }
2.使用该特性
[MyMVC3Test.Filter.DemoActionAttributeFileter(strMsg = "hello")] public class HomeController : Controller { [MyMVC3Test.Filter.DemoActionAttributeFileter(strMsg = "Actionhello")] public ActionResult Index(string strHome) { ViewBag.Message = "欢迎使用 ASP.NET MVC----"+strHome; ViewBag.Msg = "hehe"; return View(); } public ActionResult About() { return View(); } }
3.全局过滤器使用
protected void Application_Start() { AreaRegistration.RegisterAllAreas(); GlobalFilters.Filters.Add(new MyMVC3Test.Filter.DemoActionAttributeFileter(){strMsg="全局"}); RegisterGlobalFilters(GlobalFilters.Filters); RegisterRoutes(RouteTable.Routes); }
原文：http://www.cnblogs.com/fanglorry/p/4498179.html