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POCan't SaveChanges with Entity Framework in ASP.Net MVC 3 project
 

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  1. POCan't SaveChanges with Entity Framework in ASP.Net MVC 3 project
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    <p>Studying asp.net mvc 3 + EF code-first. I am new to both. My example is trivial, but I still can't make it work. Missing something simple and obvious...</p> <p>I've got a class:</p> <pre><code> public class Product { [HiddenInput(DisplayValue = false)] public int ProductID { get; set; } [Required(ErrorMessage = "Please enter a product name")] public string Name { get; set; } [Required(ErrorMessage = "Please enter a description")] [DataType(DataType.MultilineText)] public string Description { get; set; } [Required] [Range(0.01, double.MaxValue, ErrorMessage = "Please enter a positive price")] public decimal Price { get; set; } [Required(ErrorMessage = "Please specify a category")] public string Category { get; set; } } </code></pre> <p>and a <code>DbContext</code>:</p> <pre><code>public class EFDbContext : DbContext { public DbSet&lt;Product&gt; Products { get; set; } } </code></pre> <p>and a repository:</p> <pre><code>public class EFProductRepository : IProductRepository { private EFDbContext context = new EFDbContext(); public IQueryable&lt;Product&gt; Products { get { return context.Products; } } public void SaveProduct(Product product) { if (product.ProductID == 0) context.Products.Add(product); context.SaveChanges(); } } </code></pre> <p>The mvc controller:</p> <pre><code>public class AdminController : Controller { private IProductRepository repository; public AdminController(IProductRepository repo) { repository = repo; } public ViewResult Index() { return View(repository.Products); } public ViewResult Edit(int productId) { Product product = repository.Products.FirstOrDefault(p =&gt; p.ProductID == productId); return View(product); } [HttpPost] public ActionResult Edit(Product product) { if (ModelState.IsValid) { repository.SaveProduct(product); TempData["message"] = string.Format("{0} has been saved", product.Name); return RedirectToAction("Index"); } else { // there is something wrong with the data values return View(product); } } } </code></pre> <p>It lets me see the list of products, opens the edit view, validates everything according to the set of attributes...</p> <p>When I save validated changes it goes to the Http Post <code>Edit</code> method and makes the necessary <code>SaveChanges()</code>.</p> <p>It doesn't throw any exceptions, it goes on and redirect me to the list of products.</p> <p>The edited item stays unchanged.</p> <p>The underlying database (connected through <code>connectionstrings</code> in <code>web.config</code>) stays unchanged as well.</p>
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    1. COTried to find out if I used different contexts...it appeared to be that my `repository` in `AdminController` has different `GetHashCode()` if checked in two different `Edit` methods....don't know if it could say smth
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    2. COI utilize Ninject (studying DI as well)
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    3. COWouldn't the default value of ProductID be Int32.MinValue, rather than 0? And also, how and when are you passing your repository to the AdminController constructor?
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