Project targeting multiple framework in .NET

Edit the .csproj file to support the target frameworks; for example change.

<TargetFramework>netcoreapp2.1</TargetFramework>
to:
<TargetFrameworks>netcoreapp2.1;net45</TargetFrameworks>

Make sure that you change the XML element changed from singular to plural (add the “s” to both the open and close tags).

Resources

https://docs.microsoft.com/en-us/nuget/create-packages/multiple-target-frameworks-project-file

Multi-Targeting Frameworks

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