几种简单过滤器的使用

行为过滤器（ActionAttribute）

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MyZ.Web.Models;
 
namespace MyZ.Web.Attributes
{
   public class ActionAttribute : ActionFilterAttribute  //行为过滤器
    {
        /// <summary>
        /// 调用控制器对应的Action方法之后的操作
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            if (AdminContext.context.adminUser != null)
            {
                //获取用户名
                string username = AdminContext.context.adminUser.UserName;
                string controller = filterContext.RouteData.Values["Controller"].ToString();
                string action = filterContext.RouteData.Values["Action"].ToString();
                //获取系统的日志
                string msg = $"时间:{DateTime.Now},用户名:{username},已完成控制器:{controller},页面:{action}";
                //获取文件路径
                string path = "D:\\lj.txt";
                File.AppendAllText(path, msg);
            }
               
        }
 
 
        /// <summary>
        /// 调用控制器对应的Action方法之前的操作
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            if (AdminContext.context.adminUser != null)
            {
                string username = AdminContext.context.adminUser.UserName;
                string controller = filterContext.RouteData.Values["Controller"].ToString();
                string action = filterContext.RouteData.Values["Action"].ToString();
                //获取系统的日志
                string msg = $"时间:{DateTime.Now},用户名:{username},正在操作控制器:{controller},页面:{action}";
                //获取文件路径
                string path = "D:\\Exception.txt";
                File.AppendAllText(path, msg);
            }
 
                //获取用户名
         
        }
 
        /// <summary>
        /// 调用控制器对应的Action方法之后页面渲染之后的操作
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnResultExecuted(ResultExecutedContext filterContext)
        {
 
        }
 
        /// <summary>
        /// 调用控制器对应的Action方法之后页面渲染之前的操作
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnResultExecuting(ResultExecutingContext filterContext)
        {
 
        }
 
 
    }
}

异常过滤器（ExceptionAttribute）

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;
 
namespace MyZ.Web.Attributes
{
    public class ExceptionAttribute : HandleErrorAttribute  //异常过滤器
    {
        /// <summary>
        /// 系统发生异常的操作
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnException(ExceptionContext filterContext)
        {
            //Exception exception = filterContext.Exception;
            //string msg = exception.Message;
 
            //获取系统的日志
            string exception = filterContext.Exception.ToString();
            string msg = $"时间:{DateTime.Now},系统出错:{exception}";
            //获取文件路径
            string path = "D:\\Exception.txt";
            //如果文件不存在则创建
            /*if (!File.Exists(path))
            {
                File.Create(path);
            }*/
            File.AppendAllText(path, msg);
        }
    }
}

权限过滤器（PermissionAttribute）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
using MyZ.Web.Models;
 
namespace MyZ.Web.Attributes
{
    public class PermissionAttribute : AuthorizeAttribute  //权限过滤器
    {
        /// <summary>
        /// 判断认证是否通过
        /// </summary>
        /// <param name="httpContext"></param>
        /// <returns></returns>
        protected override bool AuthorizeCore(HttpContextBase httpContext)
        {
            //如果上下文不为空
            if (AdminContext.context.adminUser != null && httpContext.Session != null)
            {
                return true;
            }
            return false;
 
        }
 
        /// <summary>
        ///认证不通过的时候所做的操作
        /// </summary>
        /// <param name="filterContext"></param>
        protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
        {
            //获取用户请求的地址
            string path = filterContext.HttpContext.Request.Path;
 
            //自定义路由跳转
            Dictionary<string, object> keys = new Dictionary<string, object>();
            keys.Add("Controller", "Home");
            keys.Add("Action", "Login");
            keys.Add("ReturnUrl", path);
            var routeValue = new RouteValueDictionary(keys);
 
            //根据指定路由跳转
            filterContext.Result = new RedirectToRouteResult(routeValue);
 
        }
    }
}