Ignore one property on update Entity Framework

Question

I'm working with .NET C# and Entity Framework. I have a situation where I need to update an object in the database but I'll keep one property untouched. I'd like to know is it possible to do that? Take the following class for example: ``` public class Person { public int PersonId { get; set; } public string Name{ get; set; } public int Age { get; set; } public DateTime CreationDate { get; set; } } ``` So I would provide a HTML form in a page for the client to edit a person. Example: ``` ``` Then I'd grab the values and send to the repository to update that Person. But it does not make sense updating CreationDate, and I don't want to provide that possibility. So I could do it in 2 different ways. 1) I could put it in the form as a hidden field and post it back. (but as I said I don't want to provide that possibility) 2) In the repositor…

Accepted Answer

Personally, I use AutoMapper and use Ignore on the one field you don't want to copy. This way, if you ever add new columns to the table, you don't have to worry about adding them to your repository.

So, something like this...

```
void UpdatePerson(Person p) {
    var person = db.Persons.Find(PersonId);

Mapper.CreateMap<Person, Person>()
        .ForMember(dest => dest.CreationDate, opt => opt.Ignore());
    Mapper.Map(p, person);

db.SaveChanges();        
}
```

Ignore one property on update Entity Framework

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