MySqlException：字段 'id' 没有默认值 - Entity Framework Core 2.1

Question

I'm new to ASP.NET Core MVC. I'm getting error on inserting data to MySQL with entity framework Core. While debugging i got id in minus(-2147482645) assigned by context.Why id is assigned by EF? How to resolve this error? Table in MySQL id column is NOTNULL, PK and Auto Increment set default.

Here is my DBContextFile

    {
        public AppDbContext(DbContextOptions<AppDbContext> options)
            : base(options)
        { }

        public DbSet<PCBDesign> pCBDesigns { get; set; }



        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
        }
    }

Here is My Class

    {

        [Key]
        public int id { get; set; }
        public string userId { get; set; }
        public string desginNo { get; set; }
        public DateTime Crdate { get; set; }
        public string name { get; set; }
        public string contact { get; set; }
        public string notes { get; set; }
    }

After call context.SaveChanges(); Getting Error:

Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while updating the entries. See the inner exception for details. ---> MySql.Data.MySqlClient.MySqlException: Field 'id' doesn't have a default value ---> MySql.Data.MySqlClient.MySqlException: Field 'id' doesn't have a default value

Query of table creation:

DROP TABLE IF EXISTS `pcbdesigns`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!50503 SET character_set_client = utf8mb4 */;
CREATE TABLE `pcbdesigns` (
  `id` int NOT NULL AUTO_INCREMENT,
  `userId` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci,
  `desginNo` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci,
  `Crdate` datetime NOT NULL,
  `name` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci,
  `contact` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci,
  `notes` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `pcbdesigns`
--

LOCK TABLES `pcbdesigns` WRITE;
/*!40000 ALTER TABLE `pcbdesigns` DISABLE KEYS */;
INSERT INTO `pcbdesigns` VALUES ();
/*!40000 ALTER TABLE `pcbdesigns` ENABLE KEYS */;
UNLOCK TABLES;`

Answer 1

Problem is solved: Step 1: Copied table creation script for each table Step 2: Dropped table created from same script. Step 3: Added one dummy row in table.

Additional info: I did migration from code first approach i think there was some problem with Entity Framework Core while Migration. From now I will not do migration it will lead more error for me.

Thanks.