updatemodel

问题 I'm not sure if this is a bug in the DefaultModelBinder class or what. But UpdateModel usually doesn't change any values of the model except the ones it found a match for. Take a look at the following: [AcceptVerbs(HttpVerbs.Post)] public ViewResult Edit(List<int> Ids) { // Load list of persons from the database List<Person> people = GetFromDatabase(Ids); // shouldn't this update only the Name & Age properties of each Person object // in the collection and leave the rest of the properties (e

问题 You can see my database diagram on my previous post: MVC EF - Update navigation property I want to delete and insert categories for one post. I get the error Collection was modified; enumeration operation may not execute . at the row foreach (PostMapping pm in current_list_category) This is my function: // // POST: /BlogPost/Edit/5 [HttpPost] [ValidateAntiForgeryToken] public ActionResult Edit(Post post, int[] selectedCategories) { if (ModelState.IsValid) { List<PostMapping> current_list

问题 I've been bumbling my way through tutorials/forums in an attempt to figure out how update multiple methods using checkboxes. I need to be able to list my "events" and check or uncheck them if the date is available. I'd like to do this on one form. I know this is possible, but I'm finally coming here after failing to get it working. With the code I've posted I'm getting "Wrong Number of Arguments, 2 for 1" error. I've tried these info sources: http://railscasts.com/episodes/52-update-through

问题 Any ideas why this doesn't update but doesn't throw an error? public ActionResult Edit(int id, [Bind(Exclude = "deptid")]FormCollection collection) { var department = _repository.ListOne(id); //Grabs record from linq to sql try { UpdateModel(department); _entities.SubmitChanges(); // TODO: Add update logic here return RedirectToAction("Index"); } catch { return View(department); } } 回答1: Sometimes what may happen is an error is thrown somewhere inside of the MVC assembly which is not handled

问题 I am new to MVC, and so am working through the NerdDinner tutorial, here. In particular, I'm running into problems with the use of the UpdateModel method, which is explained in the part five of that tutorial. The problem is, when I try to edit the value of a dinner object using the UpdateModel method, the values do not get updated, and no exceptions are thrown. Oddly, I am not having any trouble with the Create or Delete features that are illustrated in the tutorial. Only the update feature

问题 I have a table in my DB called CompanyDetails . It has a column called CharacterID varchar(255) . I just changed it from a NOT NULL column to a NULL column. I ran the 'Update Model From Database...' command in the model browser as well as in the EDMX file viewer. This is what it created in the designer: /// <summary> /// There are no comments for Property CharacterId in the schema. /// </summary> [global::System.Data.Objects.DataClasses.EdmScalarPropertyAttribute(IsNullable=false)] [global:

问题 I am interested to know what you guys feel should be deemed "correct behaviour" in terms of the UpdateModel method in ASP.NET MVC. The reason I ask here is perhaps if this functionality is "by design" somebody could clarify as to why it is the way it is, and perhaps a way to call it differently to achieve desired functionality, which I would imagine would be the way 90% of folk would want this to work? In essence, my gripe lies with the behaviour of the binding process within UpdateModel .

问题 In my MVC application I used Entity Framework 6 and created database with code first approach. After a certain time, I updated one of the entity classes by adding new column and removing some columns. For reflecting these changes to the database I followed the steps below: Deleted the migrations folder in the project. Deleted the __MigrationHistory table in the database. Then run the following command in the Package Manager Console: Enable-Migrations -EnableAutomaticMigrations -Force Add the

问题 I am trying to edit a record. I have the default route. When I click the submit button I get an exception on the UpdateModel line: The model of type 'MyProject.Mvc.Models.Product' could not be updated. On the page the validation of the ProductId field is prompting the value is invalid: The value '9' is invalid. 9 is the id of the record I am trying to edit. What could be wrong? public ActionResult Edit(int id) { Product product = productRepository.GetProduct(id); return View(new

问题 I'm using EF4 in model (DB First), POCO in entities, ASP.Net in UI. I have a Biz layer of course. I need to design dynamic form generator. I decide to create a table from forms design by users, and then update my EF model in runtime, generate POCO objects and biz logic in runtime, and then compile them in runtime. I have problem about updating model in runtime. any help? Thanks in advance -Hamid 回答1: EF is not tool for your problem! EF is build around simple concept - mapping and classes are