I use View Models to hand to my MVC views, nice and slim with little if any methods on them and I use a think ORM model that has all my business logic and is generated by my ORM (BLToolkit).
So the problem is I wanted to take the View Model and update the ORM model with the modified values from the post, kind of a reverse AutoMapper (or BLToolkit.Mapper).
So a ORM class like this;
public class Contact
{
public int Id { get; set; }
public string Firstname { get; set; }
public string Lastname { get; set; }
// Loads of other properties
}
And a View Model like this (note the type and name should be “EXACTLY” the same;
public class ContactModel
{
public int Id { get; set; }
public string Firstname { get; set; }
public string Lastname { get; set; }
}
Then with this generic Extension method;
public static void MergeWith(this T1 primary, T2 secondary)
{
foreach (var pi in typeof(T2).GetProperties())
{
var tpi = typeof(T1).GetProperties().Where(x => x.Name == pi.Name).FirstOrDefault();
if (tpi == null)
{
continue;
}
var priValue = tpi.GetGetMethod().Invoke(primary, null);
var secValue = pi.GetGetMethod().Invoke(secondary, null);
if (priValue == null || !priValue.Equals(secValue))
{
tpi.GetSetMethod().Invoke(primary, new object[] { secValue });
}
}
}
So you make the magic in the Controller (for example) like this;
[Authorize]
[HttpPost]
[ValidateAntiForgeryToken]
[ValidateInput(false)]
public ActionResult EditContact(ContactModel model)
Contact c = Repo.Get<Contact,long>(model.Id);
c.MergeWith<Contact,ContactModel>(model);
Repo.Update<Contact>(c);
}
Yea its cheesy, but it works for me 
Enjoy!
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