通过RedirectToAction传递TempData [英] Passing TempData with RedirectToAction

问题描述

简介: 我是试图学习ASP.NET Core MVC的.NET学生.所以请谅解.我已经在网上搜索了我的问题的答案，但还没有找到适合我的解决方案.

Intro: I am a .NET studet trying to learn ASP.NET Core MVC. So please be understanding. I have searched the web for an answer to my problem, but havent found a solution that works for me.

问题: 我想在创建帖子时将验证消息从我的create post方法传递到索引IActionmethod，并且它们现在将其显示为警报消息.我已经在网络上阅读到ViewBag主体在重定向中幸存下来，但是TempData确实可以.到目前为止，这是我的代码.

Problem: I want to pass a validation message from my create post method to the index IActionmethod whenever a post has been created and them show it as an alert message for now. I have read on the web that ViewBag dosent survive a redirect, but a TempData does. This is my code so far.

创建发布方法:

 public IActionResult CreatePost(string textContent, string headline, string type)
    {

        var catType = new Category() { CategoryType = type.ToUpper() };

        if (db.Category.Any(s => s.CategoryType.Trim().ToLower() == type.Trim().ToLower()))
            catType = db.Category.FirstOrDefault(s => s.CategoryType.Trim().ToLower() == type.Trim().ToLower());


        var newPost = new Post()
        {
            Content = textContent,
            Header = headline,
            DateOfPost = DateTime.Now,
            category = catType

        };
        db.Posts.Add(newPost);
        db.SaveChanges();

        TempData["validation"] = "Your post hase been publsihed";

        return RedirectToAction("Index");
    }

索引方法:

public IActionResult Index()
        {

        var validation = TempData["validation"];

            var posts = (from x in db.Posts
                         orderby x.DateOfPost descending
                         orderby x.PostID descending
                         select x);

            return View(posts);
        }

我已经尝试过以下指南: ClickThis 和该版本: ClickThis2 ，但我收到了以下消息:

I have tried this guide: ClickThis and this one: ClickThis2 but I got this message:

我知道Gudie 2号的这一行可能很重要，但现在没有如何应用它. -

I know this line from gudie number 2 might be important, but didnt now how to apply it. -

var product = TempData["myTempData"] as Product;

我最后要做的就是将其传递给索引视图，但是不知道如何操作.我目前正在通过索引传递模型.

The last thing I want to do is pass it to the index view, but dont know how. I am currently passing a model from the index.

告诉我您是否想看的更多内容.就像依赖.

Tell me if it is anything more you would like to see. Like dependencies.

我得到的所有帮助都是金子，将不胜感激！！！

All the help I get is gold and will be much appreciate!!!

推荐答案

您是否配置了会话? TempData在后台使用会话.

Did you configure Session? TempData is using session behind the scenes.

Project.json

Project.json

"Microsoft.AspNetCore.Session": "1.1.0"

这是Startup.cs文件. -ConfigureServices方法

Here is the Startup.cs file. - ConfigureServices method

public void ConfigureServices(IServiceCollection services)
{
     services.AddMemoryCache();
     services.AddSession();
     services.AddMvc();
}

和Configure方法.

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    app.UseSession();
    app.UseMvc(routes => {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Index}/{id?}");
    });
}

现在尝试使用TempData，它将起作用.

Now try with TempData, it will work.

您可以使用set ASPNETCORE_ENVIRONMENT=Development环境变量设置环境.

And you can set the environment with set ASPNETCORE_ENVIRONMENT=Development environment variable.

这篇关于通过RedirectToAction传递TempData的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！