How to Resolve Missing NuGet Package References in ASP.NET Core 6 App Parts Projects?

Missing NuGet Package References for ASP.NET Core 6 App Parts Project

When creating an ASP.NET Core 6 application with separate assemblies providing additional areas, adding an extension method for IMvcBuilder to conveniently register app parts may encounter build errors. This is because the parts library lacks a Main method definition, requiring a revert to Microsoft.NET.Sdk.

In this case, the missing NuGet package references can be resolved by adding:

<ItemGroup>
  <FrameworkReference Include="Microsoft.AspNetCore.App" />
</ItemGroup>

to the library project's .csproj file.

Alternatively, you can define an internal Program class with a Main method to satisfy the build requirement for the Microsoft.NET.Sdk.Web SDK. Here's an example:

internal static class Program
{
    public static void Main() => throw new NotImplementedException();
}

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