Adding key value to TempData results in a blank page - asp.net

Question

I am building my first .NETCoreApp using 1.0.0-rc2-final. I am trying to insert a copy of Model into TempData so that it is accessible after postback.
I added Microsoft.AspNetCore.Session to my project.
I altered my Startup.cs to look like...
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System;
namespace GamesCore
{
public class Startup
{
public Startup(IHostingEnvironment env)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);
if (env.IsDevelopment())
{
// For more details on using the user secret store see http://go.microsoft.com/fwlink/?LinkID=532709
builder.AddUserSecrets();
}
builder.AddEnvironmentVariables();
Configuration = builder.Build();
}
public static IConfigurationRoot Configuration { get; private set; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
// Add framework services.
services.AddMvc();
services.AddSession();
services.AddAuthentication(
SharedOptions => SharedOptions.SignInScheme = CookieAuthenticationDefaults.AuthenticationScheme);
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole(Configuration.GetSection("Logging"));
loggerFactory.AddDebug();
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
app.UseBrowserLink();
}
else
{
app.UseExceptionHandler("/Home/Error");
}
app.UseStaticFiles();
app.UseCookieAuthentication();
app.UseOpenIdConnectAuthentication(new OpenIdConnectOptions
{
ClientId = Configuration["Authentication:AzureAd:ClientId"],
Authority = Configuration["Authentication:AzureAd:AADInstance"] + Configuration["Authentication:AzureAd:TenantId"],
CallbackPath = Configuration["Authentication:AzureAd:CallbackPath"]
});
app.UseSession(new SessionOptions { IdleTimeout = TimeSpan.FromMinutes(60) });
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
}
}
}
I have the following in one of my Controllers:
public IActionResult Index(Models.ScoreModel scoreModel)
{
if (string.IsNullOrWhiteSpace(scoreModel.Username))
{
scoreModel.GameID = new System.Guid("b90ae557-7e03-4efa-9da1-1a4e89c1f629");
scoreModel.Username = User.Identity.Name;
scoreModel.Score = 0;
scoreModel.ScoringStep = 1;
TempData.Add("scoreModel", scoreModel);
}
return View(scoreModel);
}
When I have the line with TempData in there, the page loads completely blank -- no error, no Shared Layout, etc. If I remove that line, the View loads fine within the Shared Layout. If I look at the debugger, the scoreModel is getting successfully added to TempData so that doesn't seem to be a problem.

Answer 1

I figured this out.
I moved to storing it in Session instead of TempData, using this page as an example:
http://benjii.me/2015/07/using-sessions-and-httpcontext-in-aspnet5-and-mvc6/
I serialized the Model using the extension class outlined on the above page.
One note, is that since this page was written, services.AddCaching(); has changed to services.AddDistributedMemoryCache();
See this link for another sample: https://github.com/aspnet/Session/blob/dev/samples/SessionSample/Startup.cs