Entity Framework 6 - Knowledge Base (KB)
131 results in tag: asp.net-mvc-3
An ASP.NET MVC 3 application has a problem filling dropdown boxes.
I have completed the new tutorial (musicstore) on MVC 3 over on ...www.asp.net.... It all went fine except for the part where two dropdown boxes should be populated from the database - and they are not....I followed the tutorial and double checked my cod...
asked by codys-hole
Error with MapSingleType
I create a project by MVC3 and use EFCode first for DataAccess Layer....in my DataBase I have PackaginInfo Table, and in project I carete Package Class, this is my code:...public class Package { public decimal PackageID { get; set; } public decim...
asked by maryam
Creating an interface using Entity Framework
I want to use IoC with Entity framework and Ninject. I figure I need the Generated Entity classes to implement an interface, ICRUD. There's a ...walkthrough... that shows how to force Entity framework to implement an interface. I followed the direction...
asked by P.Brian.Mackey
In an Asp.Net MVC 3 application, how can I collect complicated child objects?
I want to be able to update a model and all its collections of child objects in the same view. I have been referred to these examples: ...http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx... and ...http://blog.stevensanderson.com/2010/01/...
asked by Anders
Savechanges returns the latest insert id to asp mvc ()
im using poco code first . how do i get the last insert after savechanges() ?...thanks
asked by colorblack04
MVC, EF - Per-Web-Request DataContext singleton instance in Unity
I have a MVC 3 web application, where I am using the Entity Framework for the data access. Furthermore, I have made a simple use of the repository pattern, where e.g. all Product related stuff is handled in the "ProductRepository" and all User related stu...
asked by Nima
MVC3 HTML. "Details" view checkbox
I find very little out anywhere about how to utilize HTML helpers to render a "Details" view. First case is I have some bit fields in SQL Server that are bools in my pocos. This all works fine for the Create and Edit views but if I want a check box to sho...
asked by Bayrat
Using Entity Framework (.edmx Model) and Razor Views, create a dropdown list for MVC3 and insert a database record into several tables.
After reading 100's of articles on here about how to create a DropDown List in MVC 3 with Razor Views, I could not find one that fit my case....Situation:... I am ultimately trying to create a View to Add an Employee to a Database....Here is an image of t...
asked by Timothy Green
When using Entity Framework with ASP.NET MVC, how to handle mandatory fields
Let me start out by describing my app in a step by step format....First I have my Entity Framework generated model. Within it I have the following entities:...http://www.codetunnel.com/EFEntities.jpg...Now, to implement validation on an entity, I use part...
asked by Chev
The ObjectContext object has been deleted and cannot be utilized for any activities that require a connection.
I have this view:...@model MatchGaming.Models.ProfileQuery @{ ViewBag.Title = "Index"; } <h2>Index</h2> <script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script> <script src="@Url.Content("~/Scripts/jquery.va...
asked by anthonypliu
SqlException (0x80131904): 'dbo.Categories' is an invalid object name.
I am getting the exception above when I run an application. The application is using asp.net mvc 3 / C#. I made an mdf file and added it under App_Data folder in Visual Web Developer Express. I added connection strings to the web.config folder but when I ...
asked by user522767
Is a Controller generated for each request in ASP.NET MVC?
Very simple question: Are controllers in ASP.NET created for every HTTP request, or are they created at application startup and reused throughout requests?...Will the controller be created only for a particular HTTP request?...If my previous assumptions a...
asked by Rasto
"non-null value of type 'DateTime'" in EF 4.1 Code First. Issue
After initial dev and testing I have now pointed my MVC3 application at an existing database which contains live data....However I am getting this error related to the field called Date1 of type "datetime"....The 'Date1' property on 'StaffAttachment' coul...
asked by Paul Brown
JSON Circular Reference Serialization Error in EF 4.1 - Code First
I am getting an a Circular Reference Serialization Error although, to my knowledge I do not have any circular references. I am retrieving a set of Orders from the database and sending them to the client as JSON. All the code is shown below....This is the ...
asked by Guido Anselmi
The ObjectStateManager already has an object with the same key. Multiple objects with the same key cannot be tracked by the ObjectStateManager.
I have following code to add or update the Entity object. finding the object by primary key, based on the response I am adding or updating the object....Adding record works, but during update its giving this error message "...An object with the same key a...
asked by sfgroups
Entity Framework scaffolding error with MVC 3 and ASP.Net: There are no model classes available.
I am trying to use MVC3 with the Entity framework with Code First, but the code Template generation process in MS Visual Web Developer 2010 - is not detecting my Model in the models folder - giving a message - "No Model classes are available" - although I...
asked by André Vermeulen
Entity Framework Entity Property Override
I have an entity in EF named ...Profile... and I would like to add data annotation attributes to the ...FirstName... property of this entity. So, I created a new partial class like so;...public partial class Profile : EntityObject { [Required] [Di...
asked by Platypus Maximus
'DbContext' was not identified as a type or namespace.
I am VERY new to ASP.NET MVC (3) and am having a hard time resolving a build error in Visual Studio:...The type or namespace name 'DbContext' could not be found (are you missing a using directive or an assembly reference?)...using System; using System.Col...
asked by Chris
Entity Framework cannot identify an assembly reference while using MVC.
I am trying to use the EntityFramework with mvc 3 in VS. I have installed the EntityFramework under references but when I attempt to use the framework in the line...using System.Data.Entity.ModelConfiguration.Conventions.Edm.db; ...I receive an red error ...
asked by Bryan
In MVC Razor, how do you handle null child Entities?
I have an MVC razor view that iterates over an Orders collection. Each order has a Customer, which can be null....Trouble is, I get a null reference exception when this is the case....@foreach (var item in Model) { <tr> <td> @Html.ActionL...
asked by Duncan
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