An app started in ASP.NET Core 2.0 (I think), then migrated to 2.1, then to 2.2, now I'm trying and failing to migrate it to 3.0...
I read and tried to apply instructions in the official migration docs, according to which I was supposed to (among others) replace services.AddMvc() with services.AddRazorPages() and app.UseMvc() with app.UseEndpoints(endpoints => {endpoints.MapRazorPages();}) if I was using Razor Pages. Since as far as I'm aware I was always using Razor Pages and never full-blown MVC, this is what I did.
Now previously working URLs return HTTP 404 instead of any content...
For instance, the / or /Index route does this, even though in the project directory there is a Pages/Index.cshtml file as well as a Pages/Index.cshtml.cs file. (Although oddly: maybe it is only the Index url that is failing - I just tried pointing my browser to /Error and it worked!)
Pages/Index.cshtml.cs content (unchanged from the working version):
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Web;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Mon.Battle;
namespace mon.Pages
{
public class IndexModel : PageModel
{
public IndexModel(IBattleManager battleManager)
{
// I hope I don't have to lock this dict here, I'm only reading
configurationSerialized = battleManager.configurationSerialized;
}
public ConfigurationSerializedFormat configurationSerialized;
public void OnGet()
{
}
}
}
Pages/Index.cshtml also contains some content, but it is too long and too messy to post it here as a whole... But it should definitely return something and it was returning something before migrating to 3.0.
Page directives from the top of Index.cshtml are short enough however:
@* TODO: The site becomes ugly :( Should I start using Bootstrap, instead of trying to handcraft CSS? *@
@* Hey... I actually start to like how the site looks :) *@
@page
@using System.Text.Encodings.Web
@using Microsoft.Extensions.Configuration
@inject JavaScriptEncoder jsencoder
@inject IConfiguration conf
@using static System.Text.Json.JsonSerializer
@model IndexModel
@{
Layout = null;
}
These, unfortunately, had to change a bit from the pre-migration version: namely since 3.0 removed Newtonsoft.JSON, I had to replace it with System.Text.Json.
My current Startup.cs (I thought I applied instructions from the aforementioned docs precisely):
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.EntityFrameworkCore;
using mon.Data;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Mon.Chat;
using Mon.MatchMaker;
using Mon.Battle;
using Mon.Player;
namespace mon
{
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.Configure<CookiePolicyOptions>(options =>
{
// This lambda determines whether user consent for non-essential cookies is needed for a given request.
options.CheckConsentNeeded = context => true;
options.MinimumSameSitePolicy = SameSiteMode.None;
});
services.Configure<IdentityOptions>(options =>
{
options.User.AllowedUserNameCharacters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
});
services.AddDbContext<ApplicationDbContext>(options =>
options.UseSqlServer(
Configuration.GetConnectionString("DefaultConnection")));
services.AddDefaultIdentity<ApplicationUser>().AddRoles<IdentityRole>()
.AddEntityFrameworkStores<ApplicationDbContext>();
services.AddRazorPages();
services.AddSignalR();
services.AddSingleton<IBattleManager, BattleManager>();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
app.UseDatabaseErrorPage();
}
else
{
app.UseExceptionHandler("/Error");
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthentication();
app.UseEndpoints(endpoints =>
{
endpoints.MapHub<ChatHub>("/chathub");
endpoints.MapHub<MatchMakerHub>("/mmrhub");
endpoints.MapHub<BattleHub>("/battlehub");
endpoints.MapRazorPages();
});
}
}
}
Previous Startup.cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using mon.Data;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Mon.Chat;
using Mon.MatchMaker;
using Mon.Battle;
using Newtonsoft.Json.Serialization;
using Mon.Player;
namespace mon
{
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.Configure<CookiePolicyOptions>(options =>
{
// This lambda determines whether user consent for non-essential cookies is needed for a given request.
options.CheckConsentNeeded = context => true;
options.MinimumSameSitePolicy = SameSiteMode.None;
});
services.Configure<IdentityOptions>(options =>
{
options.User.AllowedUserNameCharacters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
});
services.AddDbContext<ApplicationDbContext>(options =>
options.UseSqlServer(
Configuration.GetConnectionString("DefaultConnection")));
services.AddDefaultIdentity<ApplicationUser>().AddRoles<IdentityRole>()
.AddEntityFrameworkStores<ApplicationDbContext>();
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
services
.AddSignalR()
.AddJsonProtocol(options =>
{
options.PayloadSerializerSettings.ContractResolver = new DefaultContractResolver();
});
services.AddSingleton<IBattleManager, BattleManager>();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
app.UseDatabaseErrorPage();
}
else
{
app.UseExceptionHandler("/Error");
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseCookiePolicy();
app.UseAuthentication();
app.UseSignalR(routes =>
{
routes.MapHub<ChatHub>("/chathub");
routes.MapHub<MatchMakerHub>("/mmrhub");
routes.MapHub<BattleHub>("/battlehub");
});
app.UseMvc();
}
}
}
What am I doing wrong? What did I miss? Why does /Index return HTTP 404?
If you ask for any more info I'll provide.
Once I had the issue with my .csproj file. Make sure your file(s) are not listed like:
<ItemGroup>
<Content Remove="Views\Extractor\Insert.cshtml" />
<Content Remove="Views\_ViewImports.cshtml" />
</ItemGroup>
This might happen when we copy paste the file/ change the build action etc.