.NETCore使用EF保存图片报错：OracleExceptiol: ORA|01460:转换请求无法实施或不合理|C/S开发框架

builder.Entity<dt_Images>().Property(p => p.ImgLarge).HasColumnName(nameof(dt_Images.ImgLarge)).HasColumnType("BLOB");
builder.Entity<dt_Images>().Property(p => p.ImgSmall).HasColumnName(nameof(dt_Images.ImgSmall)).HasColumnType("BLOB");

        [Column(TypeName = "BLOB")]
        public System.Byte[] ImgSmall { get; set; }

        [Column(TypeName = "BLOB")]
        public System.Byte[] ImgLarge { get; set; }