Passing TempData with RedirectToAction

Question

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 wor

Answer 1

I landed on this question while googling for "asp.net core redirect to action tempdata". I found the answer and am posting it here for posterity.

Problem

My issue was that, after filling in some TempData values and calling RedirectToAction(), TempData would be empty on the page that I was redirecting to.

Solution

Per HamedH's answer here: If you are running ASP.NET Core 2.1, open your Startup.cs file and make sure that in your Configure() method app.UseCookiePolicy(); comes after app.UseMVC();.

Example:

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    ...

    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Index}/{id?}");
        });
    }

    app.UseCookiePolicy();
}