Bulk load to sql server from JSON using EF

EntityDbLoader

using System;
using System.IO;
using Newtonsoft.Json.Linq;

namespace JsonToEntity
{
    public static class EntityDbLoader
    {
        public static int SaveJsonToDatabase<T>( this IDbContext dbContext, string jsonPath, Func<dynamic, T> mappingFunction, int? batchSize = 200 ) where T : class
        {
            var jsonFile = new FileInfo(jsonPath);
            var i = 0;
            var numberOfRecordsSaved = 0;
            using (var reader = new StreamReader(jsonFile.OpenRead()))
            {
                while (!reader.EndOfStream)
                {
                    dynamic jsonObject = JObject.Parse(reader.ReadLine());
                    T entity = mappingFunction.Invoke(jsonObject);
                    dbContext.Set<T>().Add(entity);
                    if (++i == batchSize.GetValueOrDefault(200))
                    {
                        i = 0;
                        numberOfRecordsSaved += dbContext.SaveChanges();
                    }
                }
            }
            return numberOfRecordsSaved;
        }
    }
}