api-conventions.cs

services.AddApiVersioning(options =>
{
    options.ReportApiVersions = true;
    options.DefaultApiVersion = new ApiVersion(1, 0);
    options.AssumeDefaultVersionWhenUnspecified = true;

    //Add Conventions
    options.Conventions.Controller<HomeController>().HasApiVersion(new ApiVersion(1, 0));
    options.Conventions.Controller<HomeV2Controller>().HasApiVersion(new ApiVersion(2, 0));
});