Localhost not found after migrating application from .net 5 to .net 6-CodePudding

I am unable to run my web application project in IIS Express after migrating from .net 5 to .net 6. I get an error stating that "the localhost page can't be found."

From what I've been able to learn, I have gone through the proper steps to migrate between target frameworks. I have changed the target framework to .net 6 in application properties, and I have updated all affected NuGet packages using the NuGet Pkg Manager. No errors are shown when I build the project, and I have ensured Visual Studio is updated to the latest version, 17.2.5 as of this writing.

The IIS Settings in my launchsettings.json file are as follows:

  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:35317",
      "sslPort": 44352
    }
  }

and I do have an Index view return in my home controller. Yet I still get the error that

No webpage was found for the web address: https://localhost:44352/

when I run the application.

I am retaining the "old" hosting model of Startup.cs and Program.cs from the .Net 5 build to save time, as I understand per Microsoft that this is acceptable. No changes have been made to the code in either of those files.

What am I missing?

EDIT: My Program.cs code is below, by request of @adrianMoskal

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }

EDIT 2:

Per @adrianMoskal, I updated my Program.cs file to .NET 6 standard. It now looks like this:

var builder = WebApplication.CreateBuilder(args);

// Add DB Contexts and Services here

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

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

app.Run();

Unfortunately, the error persists.

CodePudding user response：

I created a new project to migrate from .net 5 to .net 6, but no problem, it works fine, I will show you the complete steps：

.csproj:

change Version like below:

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <!--<TargetFramework>net5.0</TargetFramework>-->
    <TargetFramework>net6.0</TargetFramework>
    <RootNamespace>_2022070802</RootNamespace>
    <CopyRefAssembliesToPublishDirectory>false</CopyRefAssembliesToPublishDirectory>
  </PropertyGroup>

  <ItemGroup>
    <!--<PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="5.0.16" />-->
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="6.0.1" />
  </ItemGroup>

</Project>

Then I delete Startup.cs and change Program.cs：

var builder = WebApplication.CreateBuilder(args);

// Add DB Contexts and Services here

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

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

app.Run();

More detail information, see this