ASP.NET Core 2.1 Re-target to Full Framework 4.7.1

I am in the middle of upgrading one of my websites from ASP.NET 4 to ASP.NET Core 2.1 using Razor Pages and I absolutely love everything about the new development experience. I also upgraded all my libraries to use an appropriate .net standard version, but I was unable to upgrade one project due to the differences in how WindowsAzure.Storage nuget package is used when targeting full framework vs .netstandard. Too much had to be re-written so I just left that one library targeting full framework. However, when I tried to bring that dependency into the ASP.NET Core 2.1 site, it would not work since I was targeting netcoreapp2.1 and the WindowsAzure.Storage package ran into "Missing Method Exceptions". At this point, I had to either update the one library or update the site to target full framework. Long term, I want to update the library. Short term, I need to get past this problem, so re-targeting it is.

Retargeting

I had hoped that I could just change the TargetFramework element in the project file to net471, but that did not work. I was getting an error Package Microsoft.AspNetCore.App 2.1.0 is not compatible with net471 (.NETFramework,Version=v4.7.1). Package Microsoft.AspNetCore.App 2.1.0 supports: netcoreapp2.1 (.NETCoreApp,Version=v2.1) From there, I figured there were a different set of packages, so I created a new project targeting full framework and compared the project files. I noticed the following packages that I needed to use instead of Microsoft.AspNetCore.App. So here's what I had to change (note, I'm using a different Identity provider so I removed Entity Framework packages that were included by default):

Target Framework: netcoreapp2.1 => net471
Packages: Microsoft.AspNetCore.App =>
"Microsoft.AspNetCore" Version="2.1.1"
"Microsoft.AspNetCore.Authentication.Cookies" Version="2.1.1"
"Microsoft.AspNetCore.CookiePolicy" Version="2.1.1"
"Microsoft.AspNetCore.HttpsPolicy" Version="2.1.1"
"Microsoft.AspNetCore.Identity.UI" Version="2.1.1"
"Microsoft.AspNetCore.Mvc" Version="2.1.1"
"Microsoft.AspNetCore.StaticFiles" Version="2.1.1"

After these updates to the project file, I was able to compile and run and my full framework library was able to be used with no problem.