Entity Framework Core Tutorial - Knowledge Base (KB)
2454 results for: in tag: c#
EF Core Mapping EntityTypeConfiguration
In EF6 we usually able to use this way to configure the Entity....public class AccountMap : EntityTypeConfiguration<Account> { public AccountMap() { ToTable("Account"); HasKey(a => a.Id); Property(a => a.Username).HasMaxLe...
asked by Herman
A relational store has been configured without specifying either the DbConnection or connection string to use
I using asp.net vnext and ef7 when i want adding user i getting this error:...A relational store has been configured without specifying either the DbConnection or connection string to use....What is this?...Consider my app start:...using DomainModels; u...
asked by user1968030
ASP vNext and PostgreSql
exists currently any way, how to communicate with PostgreSql database, when I want to use ASP.NET vNext? I'm looking for solution, which will work mainly on linux....EF7 supports only MS SQL a SqlLite now and Npgsql isn't ported for ASP.NET vNext....Thank...
asked by Rudis
Configure more than one dbcontext in EF 7
I created a web starter application with VS 2015 ctp, and I would like to add an in-memory store to do some test, but when I try to read the data, I get this message ...The data stores 'SqlServerDataStore' 'InMemoryDataStore' are available. A context ca...
asked by Luca Morelli
many to many EF7
Models:...public partial class Film { public int FilmID { get; set; } public virtual ICollection<Genre> Genres { get; set; } } public class Genre { public int GenreID { get; set; } public virtual ICollection<Film> Films { get; set; } } ....
asked by Artem Shaban
DbSet doesn't have a Find method in EF7
I am trying to create a generic repository to access my database. In EF6 I was able to do that in order to get a specific entity:...protected IDbSet<T> dbset; public T Get(object id) { return this.dbset.Find(id); } ...DbSet in EF7 is missing a Find m...
asked by Lyudmil Dimitrov
Unable to use data annotations
So here we are trying to get a handle on EF7 ahead of the game and I'm running into what I can only call madness....In EF6 I use annotations quite a bit and I am trying to carry that over into EF7 which according to the UnicornStore project this is totall...
asked by Marqueone
Entity Framework 7 Reverse Engineering ASP.NET 5
I have been trying to migrate my database into web app model using EF7 _4. ...Couple things I realized is that the syntax/approach how to configure particular entities has been changed. ...Normally you generate POCO classes by using EF Power Tools (EF6), ...
asked by stenly
Multiple dbContexts in ASP.NET vNext and EF7
I'm trying to get along with building web systems with ASP.NET vNext using MVC 6 and EF7. I'm looking at this tutorial: ...http://stephenwalther.com/archive/2015/01/17/asp-net-5-and-angularjs-part-4-using-entity-framework-7...On the page you'll see how to...
asked by jimutt
EF7 contructor with MVC6 dependency injection
Testing out the new MVC6 and EF7 framework....We often need the HttpContext in our database layers. To do this in MVC6 we simply have a DbContext constructor that looks like this:... public class ApplicationDbContext : IdentityDbContext<ApplicationUser> ...
asked by Feech
Is there an Entity Framework 7 Database-First POCO Generator?
I've been playing around with Entity Framework 7 and ASP.NET 5 for a new project I'm working on, but I've hit a roadblock. The team I'm working on uses a DBA-first approach to development; i.e. the database is designed by DBA's and then the developers alt...
asked by Ron Penton
Entity Framework 7 and login failed
I'm trying to work with ef7 and asp.net mvc 6, but when i try to work with db there comes following exceptions:...Cannot open database "Posts" requested by the login. The login failed....Login failed for user 'alexpc\Alexandr'....In DbContext class i use...
asked by neonhash
How to work with collections
Can anyone write mini-guide which explains how to work with collections in EF?...For example I have following models: ...public class BlogPost { public int Id { get; set; } public string Title { get; set; } public string Content { get; set; } ...
asked by neonhash
Adding DbContextOptions in Startup.cs not registering data store
My problem is that the below code does not register a data store during startup. This is the specific "error" statement I get in the response from the application:...An unhandled exception occurred while processing the request. InvalidOperationException:...
asked by DanielRJ
EntityFramework 7, migrations and ConnectionString
I'm trying to create a simple web site using asp.net vnext and EF 7.0. For development I use localDB and migrations work well. Then I deploy my site to Azure and want to apply migrations to Azure SQL Server....Is there any way to apply migrations to the p...
asked by Gengzu
Define an Entity with a Unique Key at the Model Level
Using asp.net 5 entity framework 7, I would like to define a field with a unique key constraint at the model level. I am not talking about a primary key. I believe in EF 6 it used to be something like this:... [Key] public int Id{ get; set; } ...
asked by Reafidy
EF7 beta5: Error trying to insert child entity
I have created an API using ASP.NET5 and Entity Framework 7.0.0-beta 5....I have the Model, DbContext and the Repository created as is described ...here..., and when I try to insert data with a child entity my app throw an exception: ..."Cannot insert the...
asked by unairoldan
EF7 beta6: Error saving multiple entities
I am creating an API using ASP.NET5 and Entity Framework 7.0.0-beta 6, and when I try to execute various updates in several requests, I get this Exception:...'Company' cannot be tracked because another instance of this type with the same key is already be...
asked by unairoldan
Linq Join when using EF7
I have the following linq statement:...( from apiKey in context.Set<ApiKey>() join application in context.Set<Application>() on apiKey.User equals application.User join paymentGateway in context.Set<PaymentGateway>(...
asked by Jake Rote
EF 7 beta 6 : Entities with one to many relationships in EF 7
I have a very simple model:...class Bag { public int Id { get; set; } public ICollection<RandomThing> RandomThings { get; set; } } class RandomThing { public int Id { get; set; } public String Description{ get; set; } } ...My context's ..
asked by Lutando
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