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POPartially updating object with EF Code First and ASP.NET MVC
 

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    <p>EF4.1-Code-First-Gurus!</p> <p>I wonder if there is a more elegant way to handle the following ASP.NET MVC 3 EF 4.1 Code First scenario: Lets say we have the following POCOs:</p> <pre><code>public class Entity { [Key] public int Id { get; set; } [ScaffoldColumn(false)] public DateTime CreatedOn { get; set; } [ScaffoldColumn(false)] public DateTime ModifiedOn { get; set; } } </code></pre> <p>and </p> <pre><code>public class Person : Entity { public string FirstName { get; set; } public string LastName { get; set; } public DateTime Birthday { get; set; } } </code></pre> <p>Lets assume we have created some standard editing views, which are not including CreatedOn/ModifiedOn fields, because, they will be set in the repository and not by the user.</p> <p>In my repository I have the following Update method. The methods excepts a list of fields, which should be updated (leaving CreatedOn/ModifiedOn fields out):</p> <pre><code> public void Update(Person person, List&lt;string&gt; properties) { Person tmpPerson = context.People.Single(x =&gt; x.Id == person.Id); context.People.Attach(tmpPerson); foreach (PropertyDescriptor descriptor in TypeDescriptor.GetProperties(person)) { if (properties.Contains(descriptor.Name)) descriptor.SetValue(tmpPerson, descriptor.GetValue(person)); } tmpPerson.ModifiedOn = DateTime.Now; } </code></pre> <p>Now the controller is calling this method like this:</p> <pre><code> [HttpPost] public ActionResult Edit(Person person) { if (ModelState.IsValid) { personRepository.Update(person, new List&lt;string&gt; { "FirstName", "LastName", "Birthday"}); personRepository.Save(); return RedirectToAction("Index"); } else { return View(); } } </code></pre> <p>This all works like a charm. However, I really dislike, that I have to specify the fields manually. How would you handle this requirement? Of course I could add CreatedOn/ModifiedOn fields as hidden fields to the view, but I dont want to bload the form to much (There are much more fields).</p> <p>Maybe this is a similar question: <a href="https://stackoverflow.com/questions/4667621/how-to-update-ef-4-entity-in-asp-net-mvc-3">How To Update EF 4 Entity In ASP.NET MVC 3?</a></p> <p>I highly appreciate your help! Joris</p>
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