code-first

I am using ContosoUniversity example. I have just used Nuget to download and install code first migrations pakage. Whe I excecute update-database command it throws an error . Is there anything to do more than installing nuget package? Update-Database : Could not load type 'System.Data.Entity.Infrastructure.DbContextInfo' from assembly 'EntityFramework, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. At line:1 char:16 + update-database <<<< + CategoryInfo : NotSpecified: (:) [Update-Database], TypeLoadException + FullyQualifiedErrorId : System.TypeLoadException,System.Data

I've searched a lot in the forum, but haven't found anything about regarding this issue. I have 2 properties in the EntityFramework Code First: [Column(TypeName = "Money")] public decimal? Debit { get; set; } [Column(TypeName = "Money")] public decimal? Credit { get; set; } One of them should be not null, but the other one should be null Examples: Debit=null; Credit=34; Debit=45; Credit=null; On the other hand, it should not be possible to set both or none of them null. Is it possible to handle this issue with data annotations or should I solve it with a workaround? Best regards! You could

I have a situation where I have a table of entries that I'll be querying on, but in some cases I'll have additional information available. For instance, if I have a table of people , I want to be able to search by name, but I also want to store some coordinates and search based on their location, but also expose that distance in the object model. So, for instance, suppose my people table looks something like this: PersonId int Name nvarchar(100) Address nvarchar(100) Latitude float(10,6) Longitude float(10,6) And the entity class is defined like this: public class Person { public int PersonId

I'd like to start with that I have a workaround for this issue - but I spent a few hours today figuring out the cause of the exception, so I'd thought I'd share Given two entities in the domain: public class User { public int Id { get; set; } public string Name { get; set; } } public class Ticket { public int Id { get; set; } public string Name { get; set; } public virtual User Owner { get; set; } public int? LockedByUserId { get; set; } public virtual User LockedByUser { get; set; } [Timestamp] public byte[] ETag { get; set; } } The following configuration: public class TicketConfiguration :

I work with ASP.NET MVC With Durandal/Breeze templates. Let's say I have the following class: public class Person { public int Id { get; set; } public string Firstname { get; set; } public string Lastname { get; set; } public virtual List<Person> Friends { get; set; } } With the following EF Fluent API: modelBuilder.Entity<Person>() .HasMany(m => m.Friends) .WithMany() .Map(m => m.ToTable("Friends")); The database is generated successfully. The problem is when I perform a que ry with Breeze (client side) I have no data for the Friends property. var query = entityQuery.from('Person') .where('id

I'm very new to MVC 3 and I'm having problem with the Code First approach. I created 2 models, a context, view, etc and everything works perfect (able to add, delete, etc.) But when I check in Microsoft SQL Management Studio, I see 2 databases. One of them is the one I asked for in my web.config. This one contain only the membership table <connectionStrings> <add name="RecettesMaison" connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=RecettesMaison;User Id=user;Password=password;" providerName="System.Data.SqlClient"/> The second one has a strange name: "RecettesMaison.DB

I have the following entities: public class User { public int Id { get; set; } public string Name { get; set; } } public class HappyUser : User { public bool IsHappy { get; set; } } I am configuring the entities using Table Per Concrete Type (TPC) in order to generate a User table and a HappyUser table. I want the HappyUser table to include the properties of the User class, and I don't want any relationship between the two tables. I configure the entities as follows: public class UserTest : DbContext { public DbSet<User> Users { get; set; } public DbSet<HappyUser> HappyUsers { get; set; }