namespace SendMailSMSService
{
    class Program
    {
        static void Main(string[] args)
        {
            var connString = SqlDataHelper.GetConnectionString<FileContent>();
            //讀取Excle文件並寫入表中
            var bytes = File.ReadAllBytes("a.xlsx");

            var entity = new
 
 FileContent
            {
                FileContentID = Guid.NewGuid(),
                Content = bytes
            };
            var count = entity.InsertToSql(connString);
            //從表中讀取二進制並生成Excel文件
            var query = entity;
            var newEntity = entity.Query(connString, _ => _.FileContentID).FirstOrDefault();
            
 
var newBytes = newEntity.Content;

            var fs = File.Create("b.xlsx");
            fs.Write(newBytes, 0, newBytes.Length);
            fs.Flush();
            fs.Close();
            fs.Dispose();
        }
    }

    [DB("FileDB")]
    [Table("Portal.FileContent")]
    public class FileContent
    {
        [Key]
        [DataMapping]
        [SqlDataType(System.Data.SqlDbType.UniqueIdentifier)]
        
 
public Guid FileContentID { get; set; }
        [DataMapping("FileContent")]
        [SqlDataType(System.Data.SqlDbType.VarBinary)]
        public byte[] Content { get; set; }
    }
}

讀取Excel二進制寫入DB，並從DB中讀取生成Excel文件