*参考にしたページ：https://docs.microsoft.com/ja-jp/aspnet/core/fundamentals/app-state?view=aspnetcore-6.0

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllersWithViews();

builder.Services.AddDistributedMemoryCache(); //ここから

builder.Services.AddSession(options =>
{
options.IdleTimeout = TimeSpan.FromSeconds(100);
options.Cookie.HttpOnly = true;
options.Cookie.IsEssential = true;
}); //ここまで

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
app.UseExceptionHandler("/Home/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.UseSession(); //あとここ

app.MapControllerRoute(
name: "default",
pattern: "{controller=Hello}/{action=Index}/{id?}");

app.Run();