entity-framework-4.1

I should sort parent based on a field of child. sample code; IQueryable<Parent> data = context.Parents.Include(o=>o.Children); //Child has a member (string) Name. question: how can I sort Parent by Children Names. Your question is somewhat confusing, since first of all, it is tagged both with Entity Framework and LINQ-to-SQL. Which ORM are your actually using? Secondly, and more to the point, you say that you want to "sort Parent by Children Names" . Which child name do you want to sort by? You do realize that you can't compare a list of names to another list of names and decide which one

I have some Parent records already inserted in the database. Now i want to add some child records. To do this I followed following steps: Retrieve the Parent(A) records Create a new child(B) record Add parent record to the Navigation property of Child. B.A = A Call SaveChanges. The problem is when i do this EF inserts a New Parent and then add the child with a foreign key pointing to new newly inserted parent instead of inserting just the child with mapping to already existing parent. I also checked the parent's primary key when saving the child and it does exists in the database. Note that i

Entity Framework 4.1 Code First works great with SQLEXPRESS on localhost . However, I'm now ready to connect to a regular SQL 2008 server . I created a new database "NewEfDatabase". Then changed my " ApplicationServices " connectionString in Web.config to point to my new database with integrated security. But then I get this error: " CREATE DATABASE permission denied in database 'master'. " So... a) What permissions does EF 4.1 CF need on said SQL server to do its work? b) Can I setup an empty database on SQL 2008 for EF 4.1 CF, or do I have to let it do all that work for me? (I'm not sure my

How can I set the command timeout of a DbContext? I found this solution after another Google search. You can access the ObjectContext for a DbContext by casting this to an IObjectContextAdapter. From http://social.msdn.microsoft.com/Forums/en-ZA/adodotnetentityframework/thread/6fe91a64-0208-4ab8-8667-d061af340994 : public class MyContext : DbContext { public MyContext () : base(ContextHelper.CreateConnection("my connection string"), true) { ((IObjectContextAdapter)this).ObjectContext.CommandTimeout = 300; } } A better solution to this for later versions of Entity Framework is to use the

I'm creating my first N-Tier MVC application and I've run into a road block with how to manage multiple DbContexts with my database first approach. I have the following layers Presentation Service (WCF) Business Data Access I don't want an entity framework reference in my service layer but I don't see how to create an Interface or something to manage two contexts. I have it working with a single context warpped in a IDatabaseFactory but I can't seem to find an approach to manage two. Below is my UnitOfWork that is created in my Service ctor but every way I look at it I'm still tied to the

I have a simple issue with Entity Framework syntax for the "not in" SQL equivalent. Essentially, I want to convert the following SQL syntax into Entity Framework syntax: select ID from dbo.List where ID not in (list of IDs) Here is a method that I use for looking up a single record: public static List GetLists(int id) { using (dbInstance db = new dbInstance()) { return db.Lists.Where(m => m.ID == id); } } Here is a pseudo-method that I want to use for this: public static List<List> GetLists(List<int> listIDs) { using (dbInstance db = new dbInstance()) { return db.Lists.Where(**** What Goes

I'm overriding SaveChanges on my DbContext in order to implement an audit log. Working with many-to-many relationships or independent associations is relatively easy as EF creates ObjectStateEntries for any changes to those kinds of relationships. I am using foreign key associations, and when a relationship between entities changes all you get is an ObjectStateEnty that says for example entity "Title" has "PublisherID" property changed. To a human this is obviously a foreign key in Title entity, but how do I determine this in runtime? Is there a way to translate this change to a "PublisherID"

I am trying to Eagerly load all the related entities or collection of Entity in one call. My Entities Looks like: Class Person { public virtual long Id { get; set; } public virtual string FirstName { get; set; } public virtual string LastName { get; set; } } Class Employee { public virtual long Id { get; set; } public DateTime AppointmentDate { get; set; } public virtual ICollection<EmployeeTitle> Titles { get; set; } public virtual Person Person { get; set; } } Class EmployeeTitle { public virtual long Id { get; set; } public virtual bool IsCurrent { get; set; } public virtual Title Title {