Entity Framework Core - Knowledge Base (KB)
6642 results for:
Cascade delete with DbContext and Entity Framework 6
Is there a way to cascade delete entities without modifying foreign keys in DB and without modifying edmx? I have DB with over 100 tables referenced using foreign keys with Delete Rule = No Action....I found this this beautiful code in "Entity Framework ...
asked by Cherven
How can I use Entity Framework 6 and my repository to delete multiple records?
I am using Entity Framework 6 and I have a repository looking like the following with the Add and Update methods removed to make it shorter:... public class GenericRepository<T> : IRepository<T> where T : class { public GenericRepository(DbContext dbC...
asked by user1943020
Getting a the new value of RowVersion using Entity Framework 6
Is is possible, to get the new value of RowVersion using the same DbContext, without reloading the entity from the database?...Scenario:...Load data into editor form...Save new values...The row in the table gets updated, new value of RowVersion is generat...
asked by Tadej Mali
Entity framework code first migration to multiple database
Lets say we have the architecture model of web application where we have 1 database per 1 account. Database structure is the same for these accounts and differs only on data with in. How can i configurate a migrations in code first model.
asked by Vitach
Why is ON DELETE SET NULL still not implemented in the Entity Framework 6? Is there a snag?
It still is not possible to configure a relation with the ON DELETE SET NULL rule using Entity Framework code first. As a workaround you have to load all the related entities in memory and ...then... on deletion of the parent entity EF will issue SQL comm...
asked by Dabblernl
Can I use Entity Framework 6 with Visual Studio 2010?
Our development team (and build servers) successfully use a mixture of Visual Studio 2010 and Visual Studio 2012 for our application....However, since upgrading from EF5 to EF6, we no longer seem to be able to build with VS2010. Specifically, the build ma...
asked by Rob
How to unit test async methods of Entity Framework with a multiple clauses
I'm trying to unit test an async method in EF 6.0.2 with Moq 4.0.10827 and I'm getting blocked in what appears to be a casting issue....The following works fine:...public async Task<List<Testimonial>> GetByEventIdAsync(int eventId) { var query = from ...
asked by Dan Friedman
How to map non-public Collection properties with Entity Framework Code First?
I am trying to map a collection of entities with a non-public property, so as to better encapsulate my domain, since the entity that contains the collection needs to enforce certain rules on the collection, e.g.... public class Foo { public AddBa...
asked by Nathan
Entity framework optional 1 to 1 relation on both ends
Most questions I have found were not the type I am looking for....I have 2 tables:...public class User { [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)] public Guid UserId { get; set; } public Guid? CustomerId { get; set; } [F...
asked by Roger Far
Entity Framework Enum and string association
I want to use the method in ...this article... to implement friendlier ToString() outputs for my enum types. I would like to know how this can be done in Entity Framework's auto generated Enum codes? Would I have to modify the code generation template (if...
asked by thankyoussd
Two (almost) concurrent DbContexts causing problems: How to share between Controller and AuthorizeAttribute
Every once in a while, I'm encountering the following exception in my ASP.NET/MVC5/WebAPI2/EF6/MSSQL application:...System.InvalidOperationException: The context cannot be used while the model is being created. This exception may be thrown if the context ...
asked by Alex
Schema specified is not valid. Errors: The relationship 'EntityA_EntityBs' was not loaded because the type 'EntityB' is not available
Background...I'm working on an application that uses Entity Framework to query a database from a third-party application. The database has a large number of tables and no foreign keys. I've mapped the relevant tables to entities using Entity Framework Flu...
asked by Sam
Stored procedure has to many arguments specified entity framework
I'm using Entity Framework 6 with Stored Procedures mapping. I have an insert sp with 6 parameters for the insert. The entity that I insert has 8 properties where one property is the Id....The problem is that I get this error:...Procedure or function sp h...
asked by Ralph Jansen
Select records count from multiple tables in a single query
I have some models (restaurants, shops, products), and i want to select records count for multiple models in a single linq query....I know how it should be in sql, but i don't know how to translate it in linq:...select (select count(*) from restaurant...
asked by alexmac
How to group by DateTime.Date in EntityFramework
I have a device model:...public class DeviceModel { public DateTime Added { get;set; } } ...And i want to select devices count, grouped by ...Added... date (...not Date and Time, but only date...). My current implementation is not valid, because linq ...
asked by alexmac
Entity Framework 6 and output parameter
First time working with EF in general and wanted to call a stored procedure. So far I've added the stored procedure in a model (.edmx) and I believe that it's calling properly but I'm not sure how to add the output parameter. ...This is what the stored p...
asked by Mike Stone
Creating indexes with Entity Framework 6 Migrations
Is there a way to create an index in MS SQL Server database using Entity Framework Code First Migrations, if the index has to be: ...descending by at least one column...including other columns...?...It has to produce something like this:...CREATE NONCLUST...
asked by Michael Sagalovich
EF6 Foreign Key Issue
Here are my models...public class Driver { public int Id { get; set; } public String Name { get; set; } public int VehicleId { get; set; } public virtual Vehicle Vehicle { get; set; } } public class Vehicle { public int Id { get; s...
asked by Ashish Charan
Entity Framework map struct/complex type without model properties
I have a 'model ...struct...' which is internally a string, but is being used to somewhat similiar to a ...GUID.......public struct Token { private string _value; private Token(Guid uuid) { _value = Token.FromGuid(uuid); } publi...
asked by Acrotygma
Entity Framework Code-First Migration Fails with SQL Server
Using Entity Framework 6 and SQL Server, I get the following error when EF is doing the migration thing:...Unable to update database to match the current model because there are pending changes and automatic migration is disabled. Either write the pending...
asked by John Smith
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