MVC使用TempData跨控制器传递信息而无需记住key的名称

「爱情、让人受尽委屈。」 2022-03-29 07:28 144阅读 0赞

通常情况下，使用TempData需要记住key的名称，本篇体验：通过帮助类，实现对TempData的设置、获取、删除。

**关于传递信息的类：**

namespace MvcApplication1.Models
    {
        public class Notification
        {
            public bool IsShow { get; set; }
            public string Content { get; set; }
        }
    }

**帮助类，使用TempData对信息处理：**

using System;
    using System.Web.Mvc;
    using MvcApplication1.Models;
    
    namespace MvcApplication1.Extension
    {
        public class NotificationHelper
        {
            public static void SetNotification(Controller controller, bool isShow, string content)
            {
                Notification notification = new Notification()
                {
                    IsShow = isShow,
                    Content = content
                };
                controller.TempData["n"] = notification;
            }
    
            public static Notification GetNotification(Controller controller)
            {
                try
                {
                    Notification notification = controller.TempData["n"] as Notification;
                    return notification;
                }
                catch (Exception ex)
                {
                    //TODO:记录日志
                    return null;
                }
            }
    
            public static void RemoveNotification(Controller controller)
            {
                controller.TempData.Remove("n");
            }
        }
    }

**在HomeController中，把信息放到TempData中：**

using System.Web.Mvc;
    using MvcApplication1.Extension;
    
    namespace MvcApplication1.Controllers
    {
        public class HomeController : Controller
        {
           
            public ActionResult Index()
            {
                NotificationHelper.SetNotification(this, true, "放假了~~");
                return View();
            }
    
        }
    }

**Home/Index.cshtml视图为：**

@{
        ViewBag.Title = "Index";
        Layout = "~/Views/Shared/_Layout.cshtml";
    }
    
    <h2>Index</h2>
    
    @Html.ActionLink("看看TestController那边是否放假了","Index","Test")

[![1][]][1 1]

**在TestController中，获取TempData存储的信息：**

using System.Web.Mvc;
    using MvcApplication1.Extension;
    using MvcApplication1.Models;
    
    namespace MvcApplication1.Controllers
    {
        public class TestController : Controller
        {
    
            public ActionResult Index()
            {
                Notification notification = NotificationHelper.GetNotification(this);
                if (notification != null)
                {
                    ViewData["t"] = notification.IsShow;
                    ViewData["c"] = notification.Content;
                }
                return View();
            }
        }
    }

**Test/Index.cshtml视图：**

@using MvcApplication1.Models
    @{
        ViewBag.Title = "Index";
        Layout = "~/Views/Shared/_Layout.cshtml";
    }
    
    <h2>Test</h2>
    
    @if (ViewData["t"] != null)
    {
        Notification notification = new Notification()
        {
            IsShow = (bool)ViewData["t"],
            Content = ViewData["c"] as string
        };
    
        if (notification.IsShow)
        {
            @notification.Content
        }
        else
        {
            @: 有通知，但未发布
        }
    }
    else
    {
      @: 暂无通知
    }

[![2][]][2 1]

[1]: /images/20220329/443afbc70e734e71b769715a5948494b.png
[1 1]: https://images0.cnblogs.com/blog/417212/201406/021355319893504.png
[2]: /images/20220329/26960e434da84d2e9cdae2d05e7d18db.png
[2 1]: https://images0.cnblogs.com/blog/417212/201406/021355345052601.png