createscope

        /// <summary>
        /// Creates a new <see cref="IServiceScope"/> that can be used to resolve scoped services.
        /// </summary>
        /// <param name="provider">The <see cref="IServiceProvider"/> to create the scope from.</param>
        /// <returns>A <see cref="IServiceScope"/> that can be used to resolve scoped services.</returns>
        public static IServiceScope CreateScope(this IServiceProvider provider)
        {
            return provider.GetRequiredService<IServiceScopeFactory>().CreateScope();
        }

https://github.com/aspnet/Extensions/blob/3ba072c25373c19ab2cfe34483e733f3b926b2c0/src/DependencyInjection/DI.Abstractions/src/ServiceProviderServiceExtensions.cs