ASP.NET MVC下判断用户登录和授权状态方法

通过继承ActionFilterAttribute使用其中的OnActionExecuting方法来实现IActionFilter接口。

派生ActionFilterAttribute类

// 登录认证特性
public class AuthenticationAttribute : ActionFilterAttribute
{
  public override void OnActionExecuting(ActionExecutingContext filterContext)
  {
    if (filterContext.HttpContext.Session["username"] == null)
      filterContext.Result = new RedirectToRouteResult("Login", new RouteValueDictionary { { "from", Request.Url.ToString() } });
    base.OnActionExecuting(filterContext);
  }
}

 

使用方法

public class HomeController : Controller 
{ 
    [Authentication] 
    public ActionResult Index()
    {
        return View();
    }
}

 

针对整个MVC项目的所有Action都使用过滤器，则需要如下操作

1. 确保Global.asax.cs的Application_Start方法中包含FilterConfig被调用

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();
        WebApiConfig.Register(GlobalConfiguration.Configuration);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
    }
}

 

2. 在FilterConfig.cs文件中注册相应的特性过滤器

public class FilterConfig
{
    public static void RegisterGlobalFilters(GlobalFilterCollection filters)
    {
        filters.Add(new HandleErrorAttribute());
        filters.Add(new AuthenticationAttribute());
    }
}