MVC中的Action过滤器

Action过滤器可以用在调用动作方法之前或之后，执行一些特殊的逻辑，比如用登录验证：

Action过滤器实现IActionFilter接口，该接口有两个方法：

 public interface IActionFilter

    {

        void OnActionExecuted(ActionExecutedContext filterContext);

        void OnActionExecuting(ActionExecutingContext filterContext);

    }

我们先创建一个BaseController，在这个基类中重写OnActionExecuting方法，用于让其他的控制器继承此基类。如：

using System;

using System.Collections.Generic;

using System.Configuration;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using System.Web.Script.Serialization;

using XFK.PICCInsureTravel.Common;

using XinfuMall.XinfuWeb.PublicClass;

namespace XFK.PICCInsureTravel.Controllers

{

    public abstract class BaseController : Controller

    {

        public JavaScriptSerializer js = new JavaScriptSerializer();

        public LogHelper log = null;

        public UserSession user { get; set; }

        public EnterpriseAccountSession enterprise { get; set; }

        protected override void OnActionExecuting(ActionExecutingContext filterContext)

        {

            base.OnActionExecuting(filterContext);

            LogHelper.WriteLog("进入BaseController");

            TempData["xinfuUrl"] = System.Configuration.ConfigurationManager.AppSettings["xinfuUrl"];

            if (XFK.Infrastructure.Util.SessionManager.Read(UserUtil.user_sessionStr) != null)

            {

                user = XFK.Infrastructure.Util.SessionManager.Read(UserUtil.user_sessionStr) as UserSession;

                object enterpriseId = XFK.Infrastructure.Util.SessionManager.Read(EnterpriseUtil.enterprise_sessionId);

                enterprise = new EnterpriseAccountSession();

                enterprise.Id = Convert.ToInt32(enterpriseId);

                ViewBag.UserName = user.AccountName;

                ViewBag.Enterpriseid = Convert.ToInt32(enterpriseId);

                var limitEnterprise = String.IsNullOrEmpty(ConfigurationManager.AppSettings["limitEnterprise"]) ? "" : ConfigurationManager.AppSettings["limitEnterprise"];

                if (limitEnterprise.Split(',').Contains(enterprise.Id.ToString()))

                {

                    System.Web.HttpContext.Current.Response.Write("对不起，所属的企业没有订购此产品的权限！");

                }

            }

            else

            {

                filterContext.Result = new RedirectResult(ConfigurationManager.AppSettings["xinfuUrl"] + "mall/Login?originUrl=" + HttpUtility.UrlEncode(Request.Url.ToString()));

                LogHelper.WriteLog("当前访问的路径是：" + ConfigurationManager.AppSettings["xinfuUrl"] + "mall/Login?originUrl=" + HttpUtility.UrlEncode(Request.Url.ToString()));

            }

        }

    }

}

注意，当验证不通过时，我们给filterContext.Result赋值，用于跳转页面。这个filterContext.Result属性是一个ActionResult类型的子集---RedirectResult：

当执行到filterContext.Result时，我们给它赋值以后，便会执行跳转。

这个BaseController建好以后，下面的工作就是在其他控制器中使用了：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

namespace XFK.PICCInsureTravel.Controllers

{

    public class HomeController : BaseController

    {

        public ActionResult Index()

        {

            return View();

        }

    }

}

参考：http://skybirdzw.blog.163.com/blog/static/72570626201781465310313/

MVC中的Action过滤器的相关教程结束。