ASP.NET Core default template project fails with HTTP ERROR 404 or Exception

Question

I have a problem with ASP.NET Core MVC or Razor applaunch.json.

I use a default template to create a project with default settings:

ASP.Net Core Web App - Dot Net 6
ASP.Net Core Web App MVC - Dot Net 6

This is my applaunch.json:

{
    "iisSettings": {
        "windowsAuthentication": false,
        "anonymousAuthentication": true,
        "iisExpress": {
            "applicationUrl": "http://localhost:18583",
            "sslPort": 44326
        }
    },
    "profiles": {
        "WebApplication12": {
            "commandName": "Project",
            "dotnetRunMessages": true,
            "launchBrowser": true,
            "applicationUrl": "https://localhost:7081;http://localhost:5081",
            "environmentVariables": {
                "ASPNETCORE_ENVIRONMENT": "Development"
            }
        },
        "IIS Express": {
            "commandName": "IISExpress",
            "launchBrowser": true,
            "environmentVariables": {
                "ASPNETCORE_ENVIRONMENT": "Development"
            }
        }
    }
}

And program.cs :

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddControllersWithViews();

var app = builder.Build();

if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
    app.UseHsts();
}

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

app.UseRouting();

app.UseAuthorization();

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

app.Run();

After launch console shows that no problem with listening to ports :

But I get an exception for my ASP.NET Core MVC projects:

And I get 404 for Razor Pages:

All configurations are default template configurations.

Did anyone experience the same problem?

In the same directory of the project, do dotnet run watch and see if that helps. I had a similar problem and the root cause might be Visual Studio did not attempt or its launch of dotnet run got killed. — devyJava
– devyJava, Commented Apr 16, 2022 at 17:54
@devyJava It's working with dotnet run watch but launching with Visual Studio not working and it's really annoying. — Reza Heidari
– Reza Heidari, Commented Apr 16, 2022 at 18:04

Reza Heidari · Accepted Answer · 2022-04-17 11:08:50Z

5

I solved the problem by using Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation package and adding the following service:

For ASP.NET Core Razor template

builder.Services.AddRazorPages().AddRazorRuntimeCompilation();

And for the MVC project template:

builder.Services.AddControllersWithViews().AddRazorRuntimeCompilation();

The second solution is to use dotnet run watch either in Developer Power Shell or Command-Line.

answered Apr 17, 2022 at 11:08

Reza Heidari

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4 Comments

Isaac Over a year ago

This solved my problem also, adding the AddRazorRuntimeCompilation() to AddControllersWithView(). Trying to fully understand why it worked though

Reza Heidari Over a year ago

@Isaac Yes it works, yet I could not manage to understand what is going on under the hood; please share if you find something :)

David Stania Over a year ago

Solved my problem too. But I have no idea why the default template is not working by default.

Darkness Jul 27 at 15:52

This issue still seems to persist in .NET 8 templates. Thanks for the hint

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