1:<provider invariantName="System.Data.SQLite.EF6" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />


2:<remove invariant="System.Data.SQLite" />
<add name="SQLite Data Provider" invariant="System.Data.SQLite"  description=".NET Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" />

class Program

    {

        static void Main(string[] args)

        {

            DbConnection dbConnection_1 = new SQLiteConnection("data source=D:\\SqLiteCoFirst1.db");

            var ctx1 = new mybookdb(dbConnection_1);

            ctx1.Books.Add(new book() { 

            Author="123"

            });

            Console.WriteLine(ctx1.SaveChanges());

            Console.WriteLine(JsonConvert.SerializeObject(ctx1.Books.ToList()));

            Console.ReadLine();

        }

    }

    class book

    {

        public int id { get; set; }

        public string Name { get; set; }//书名

        public DateTime PublishDate { get; set; }//出版日期

        public string Author { get; set; }//作者

        public float Price { get; set; }//价格

    }

    class mybookdb : DbContext

    {

        public DbSet<book> Books { get; set; }

        static string dbPath = $"Data Source=E:\\thumbnail.db";

        public mybookdb(DbConnection dbConnection,bool contextOwnsConnection=true):base(dbConnection,contextOwnsConnection)

        {

        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)

        {

            // Database.SetInitializer(new SqliteCreateDatabaseIfNotExists<ThumbnailContext>(modelBuilder));

           // ModelConfiguration.Configure(modelBuilder);

            var init = new SqliteCreateDatabaseIfNotExists<mybookdb>(modelBuilder);

            Database.SetInitializer(init);

        }

        public class ModelConfiguration

        {

            public static void Configure(DbModelBuilder modelBuilder)

            {

                ConfigureBookEntity(modelBuilder);

            }

            private static void ConfigureBookEntity(DbModelBuilder modelBuilder)

            {

                modelBuilder.Entity<book>();

            }

        }

    }