Cannot resolve DbContext in ASP.NET Core 2.0

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You’re registering SGDTPContext as a scoped service and then attempting to access it outside of a scope. To create a scope inside your SeedDatabase method, use the following:

using (var serviceScope = app.ApplicationServices.CreateScope())
{
    var context = serviceScope.ServiceProvider.GetService<SGDTPContext>();

    // Seed the database.
}

Credit to @khellang for pointing out the CreateScope extension method in the comments and to @Tseng’s comment and answer re how to implement seeding in EF Core 2.

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