QQ: How can I implement an automatic POCO converter

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C#

Hi,

I write multi tier applications. Each tier has it's own POCO version of each db object. As I pass the objects up and down the layers I have to convert it from one layers version to the next.

I could create an extension that did this for me by parsing the property info, but I'm sure there must be a better way. Am I missing something obvious?

Also, what would I do if the data types don't exactly match (i.e. Linq.Binary => byte[])?

Thanks
Andy ^_^

---

As an example, here is what I am currently doing between my UIL (user interface layer?) and BLL (business logic layer):

using System;
using System.Collections.Generic;
using System.IO;
using F = DataFactory.Factory; //Generic data factory
using W = DataFactory.Workers; //specific data workers
using M = DataFactory.Models;  //specific BLL models

namespace CustomControls.Projections
{
    // easy to access in UIL
    public class Upload
    {
        public int Id { get; set; }
        public string FileName { get; set; }
        public byte[] File { get; set; }
        public int? SupplierId { get; set; }

        public MemoryStream ToStream()
        {
            // just coz it's easier to read when I use it.  Some files (not these) will need to be read in from a file system etc.
            return new MemoryStream(File);
        }

        public static List<Upload> SelectAll()
        {
            return F.DataFactory<W.Upload>.SelectAll<M.Upload>().ConvertAll(Converter);
        }

        public static Upload SelectById(int id)
        {
            return Converter(F.DataFactory<W.Upload>.SelectById<M.Upload>(id));
        }

        public static int Save(Upload item, bool updateRelated = false)
        {
            return F.DataFactory<W.Upload>.Save<int>(Converter(item), updateRelated);
        }

        private static M.Upload Converter(Upload arg)
        {
            if (arg == null)
                return null;
            return new M.Upload
            {
                Id = arg.Id,
                FileName = arg.FileName,
                File = arg.File,
                SupplierId = arg.SupplierId
            };
        }

        private static Upload Converter(M.Upload arg)
        {
            if (arg == null)
                return null;
            return new Upload
            {
                Id = arg.Id,
                FileName = arg.FileName,
                File = arg.File,
                SupplierId = arg.SupplierId
            };
        }
    }
}