Update dotnet template

[eskaufel]

When creating a new project with cli using the MiniBlog template I get an old version (2.0).

[surfmuggle]

I am running into the same issue

Steps i took

1. In my *.csproj i changed the targetframework to netcoreapp3.1 and try to build /
   1.1. This gave the error Microsoft.AspNetCore.All not supported. Change reference to Microsoft.AspNetCore.App
2. After adding <PackageReference Include="Microsoft.AspNetCore.App" Version="3.*" /> and removing the reference to All i got error 3
3. Startup.cs did contain error CS1061: 'IApplicationBuilder' does not contain a definition for 'UseBrowserLink' and no accessible extension method 'UseBrowserLink' accepting a first argument of type 'IApplicationBuilder' could be found (are you missing a using directive or an assembly reference?) [C:\dev\_dotnetcore\CMS\MiniblogOne\MiniblogOne.csproj].
   And also '"IHostingEnvironment" is obsolete. The recommended alternative is Microsoft.AspNetCore.Hosting.IWebHostEnvironment."
   So i changed the code to this Configure(IApplicationBuilder app, IWebHostEnvironment env)
   Since it is unclear to me what i have to do to replace UseBrowserLink. i removed the following code from Startup.cs

       // IsDevelopment is not supported for Microsoft.AspNetCore.Hosting.IWebHostEnvironment
       if (env.IsDevelopment()) 
       {
           app.UseBrowserLink(); // this is not supported either in .net Core 3.1
           app.UseDeveloperExceptionPage();
       }

4. The next error was

Microsoft.AspNetCore.Hosting.WebHost[6] Application startup exception
System.InvalidOperationException: 
Endpoint Routing does not support 'IApplicationBuilder.UseMvc(...)'. 
To use 'IApplicationBuilder.UseMvc' set 'MvcOptions.EnableEndpointRouting = false'
 inside 'ConfigureServices(...).

The cause are likely these lines

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });

I am puzzled. How much do i have to change to be able to get it to run.

[surfmuggle]

Hallo @eskaufel
have you seen #159 (comment)

I'm` taking pull requests, but not actively working on it myself.