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POStrongly-Typed ASP.NET MVC with ADO.NET Entity Framework
 

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    <p>I've finally gotten this working after days of struggle.</p> <p>I've got a simple database of People and Departments:</p> <p><a href="http://img39.imageshack.us/img39/1368/edmxdepartmentperson.gif" rel="nofollow noreferrer">ADO.NET Entity Framework Entity Data Model diagram with Department and Person objects http://img39.imageshack.us/img39/1368/edmxdepartmentperson.gif</a></p> <p>I can use strongly-typed ASP.NET MVC views for reference/navigation properties! See the list of departments...</p> <p><a href="http://img11.imageshack.us/img11/7619/dropdownlistdepartment.gif" rel="nofollow noreferrer">ASP.NET MVC with DropDownList http://img11.imageshack.us/img11/7619/dropdownlistdepartment.gif</a></p> <p>Part of my Person/Edit view:</p> <pre><code>&lt;% using (Html.BeginForm()) {%&gt; &lt;%= Html.Hidden("Id", Model.Id) %&gt; &lt;fieldset&gt; &lt;legend&gt;Fields&lt;/legend&gt; &lt;p&gt; &lt;label for="Name"&gt;Name:&lt;/label&gt; &lt;%= Html.TextBox("Name", Model.Name) %&gt; &lt;/p&gt; &lt;p&gt; &lt;label for="DepartmentId"&gt;Department:&lt;/label&gt; &lt;%= Html.DropDownList("DepartmentId", new SelectList((IEnumerable)ViewData["Departments"], "Id", "Name"))%&gt; &lt;/p&gt; &lt;p&gt; &lt;input type="submit" value="Save" /&gt; &lt;/p&gt; &lt;/fieldset&gt; &lt;% } %&gt; </code></pre> <p>Part of my Person controller:</p> <pre><code>// // GET: /Person/Edit/5 public ActionResult Edit(Guid id) { ViewData["Departments"] = ctx.Department; Person model = (from Person p in ctx.Person where p.Id == id select p).FirstOrDefault(); return View(model); } // // POST: /Person/Edit [AcceptVerbs(HttpVerbs.Post)] public ActionResult Edit(Person model) { ctx.AttachUpdated(model); //extension ctx.SaveChanges(); return RedirectToAction("Index"); } </code></pre> <p>To get this working, I extended the Person EntityObject with a new DepartmentId property.</p> <pre><code>using System; using System.Data; using System.Data.Objects.DataClasses; namespace ProjectName.Models { public partial class Person : EntityObject { public Guid DepartmentId { get { try { return (Guid)this.DepartmentReference.EntityKey.EntityKeyValues[0].Value; } catch { return Guid.Empty; } } set { this.DepartmentReference.EntityKey = new EntityKey("JunkEntities.Department", "Id", value); } } } } </code></pre> <p>And I extended the Entity Framework ObjectContext with new AttachUpdated and ApplyReferencePropertyChanges methods:</p> <pre><code>using System; using System.Data; using System.Data.Objects; using System.Data.Objects.DataClasses; public static class EntityFrameworkExtensionMethods { public static void AttachUpdated(this ObjectContext ctx, EntityObject objectDetached) { if (objectDetached.EntityKey == null) { String entitySetName = ctx.DefaultContainerName + "." + objectDetached.GetType().Name; Guid objectId = (Guid)objectDetached.GetType().GetProperty("Id").GetValue(objectDetached, null); objectDetached.EntityKey = new System.Data.EntityKey(entitySetName, "Id", objectId); } if (objectDetached.EntityState == EntityState.Detached) { object currentEntityInDb = null; if (ctx.TryGetObjectByKey(objectDetached.EntityKey, out currentEntityInDb)) { ctx.ApplyPropertyChanges(objectDetached.EntityKey.EntitySetName, objectDetached); ctx.ApplyReferencePropertyChanges((IEntityWithRelationships)objectDetached, (IEntityWithRelationships)currentEntityInDb); //extension } else { throw new ObjectNotFoundException(); } } } public static void ApplyReferencePropertyChanges(this ObjectContext ctx, IEntityWithRelationships newEntity, IEntityWithRelationships oldEntity) { foreach (var relatedEnd in oldEntity.RelationshipManager.GetAllRelatedEnds()) { var oldRef = relatedEnd as EntityReference; if (oldRef != null) { var newRef = newEntity.RelationshipManager.GetRelatedEnd(oldRef.RelationshipName, oldRef.TargetRoleName) as EntityReference; oldRef.EntityKey = newRef.EntityKey; } } } } </code></pre> <p>I just wanted to document my progress here. Please suggest improvements.</p> <hr> <p>Thanks:</p> <ul> <li><a href="http://blogs.msdn.com/alexj/archive/2009/03/25/tip-7-faking-foreign-key-properties-in-net-3-5-sp1.aspx" rel="nofollow noreferrer">Alex James</a></li> <li><a href="http://blogs.msdn.com/cesardelatorre/archive/2008/09/04/updating-data-using-entity-framework-in-n-tier-and-n-layer-applications-short-lived-ef-contexts.aspx" rel="nofollow noreferrer">Cesar de la Torre</a></li> <li><a href="http://grifftownsend.blogspot.com/2008/08/small-extension-to-entity-framework.html" rel="nofollow noreferrer">Griff Townsend</a></li> <li><a href="https://stackoverflow.com/questions/898260/entitykey-and-applypropertychanges/898367#898367">Steve Willcock</a></li> <li><a href="https://stackoverflow.com/questions/899734/strongly-typed-asp-net-mvc-with-entity-framework/902202#902202">jrista</a></li> <li><a href="https://stackoverflow.com/questions/895564/entity-framework-with-asp-net-mvc/895688#895688">Tomas Lycken</a></li> <li><a href="https://stackoverflow.com/questions/921106/how-to-create-ado-net-entity-framework-objectcontext-extensions/921303#921303">Thomas Levesque</a></li> <li><a href="http://blogs.msdn.com/dsimmons/archive/2008/01/16/ef-extension-method-extravaganza-part-i-objectstateentry.aspx" rel="nofollow noreferrer">Danny Simmons</a></li> <li><a href="http://www.scip.be/index.php?Page=ArticlesNET26&amp;Lang=NL" rel="nofollow noreferrer">Stefan Cruysberghs</a></li> </ul>
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    1. CONice job, but unfortunately stackoverflow.com in not the place for you to document your progress. I voted to close: "not a real question".
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      1. USAndrew Hare
    2. CODon't you need to exclude the ID property when binding the person object here : public ActionResult Edit(Guid id, Person Model) ?
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      1. USÇağdaş Tekin
    3. COAh, I missed the part about "suggesting improvements". Let it live, I say.
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