entity-framework-6

问题 I'm using EF 6 alpha 3 code first. When I try to create the database on SQL Azure running the Update-Database command I get the following error: Tables without a clustered index are not supported in this version of SQL Server. Please create a clustered index and try again. I tracked down the error to the __MigrationHistory table creation sql command. CREATE TABLE [dbo].[__MigrationHistory] ( [MigrationId] [nvarchar](255) NOT NULL, [ContextKey] [nvarchar](512) NOT NULL, [Model] [varbinary](max

问题 I have an MVC application that uses Entity Framework. I am using a repository, unit of work and unity as dependency injection. The problem I have is that I have different authentication types, and each type I want a different class, so I decided to use the Strategy pattern public interface IAuthStrategy { OperationResponse<AuthenticationMechanismDTO> GetAuthenticationMechanism(string userName); } public class AuthStrategy { readonly IAuthStrategy _authStrategy; public AuthStrategy

问题 I have set of Entities generated according to DB First work flow in EntityFramework. The Entities have in proper names so i decide to change them but when i change the Entity name, the navigation property keeps the pluralization and the singularization of the old name like the following : Two Entities ( SREmp ,SRPic ) SREmp SRPic Id id name content phone note - - - - - - SRPics SREmp Now when i change the names of my entities to ( Employee,EmpPhoto ), the navigation properties didn't change !

问题 I am trying to do an update-database on an EF6 code first database. All I've done is build my models and the datacontext, run enable-migrations and did an add-migration InitialCreate. That all worked well. But the update-database is failing in two different ways. For a while I had it working, but it was creating the database files (i.e., the MDF and log files) under c:\Users\. I don't want them there. I want them in the App_Data folder of an MVC website I'm building (the database schema is in

问题 I'm using EFCache to provide 2nd-level caching in my EF context. I ran into a problem, where one of my entities is connected to a view which provides row-level security. So this view filters rows based on some parameters. When using 2nd-level cache, all users will get the same result! I'm looking for a way to exclude certain entities from caching, any help is welcome. This is my caching configuration: class CacheConfiguration : DbConfiguration { public CacheConfiguration() { var

问题 I'm working on a project to gradually phase out a legacy application. In the proces, as a temporary solution we integrate with the legacy application using the database. The legacy application uses transactions with serializable isolation level. Because of database integration with a legacy application, i am for the moment best off using the same pessimistic concurrency model and serializable isolation level. These serialised transactions should not only be wrapped around the SaveChanges

问题 I have a Linq-Query to get my EF-Data. My query joins 4 tables and selects the result to a denormalized type. I will need this query very often but with different predicates. The List-ExtensionMethods (e.g. .Where() are working with a Func<T,bool> as a parameter and I wanted to do it the same - but I don´t find a way to access my predicate in my Method. public DenormalizedType GetData(Func<Thing, bool> predicate) { using (var dbContext = new MyDbContext()) { var myData = (from some in

问题 I'm trying to create an EDMX file using VS2013 so I can read/write from a DB2 Database. I go through the same process as creating the EDMX from my SQL tables (Right click on project -> Add New Item -> ADO.NET Entity Data Model -> EF Designer from database -> Not using SQL this time so: new connection -> Change data source) but in the Data Source option, DB2 is not available. I have 2 SQL options and that's it. Data Source So after doing some investigating around here along with some other

问题 I know how to create common multi-columns index in c# which is mapping table in database. But I encounter one specifical question on Multiple columns index, here is the code: public class Table1 { [Index("MultipleIndexColumn",1)] public Table2 Table2_ID {get; set;} [Index("MultipleIndexColumn",2)] public Table3 Table3_ID {get; set;} [Index("MultipleIndexColumn",3)] public DateTime CreateDateTime {get; set;} } EF6 will generate t-sql like this : create index MultipleIndexColumn on Table1

问题 Is there a way to set a filter on a navigation property using EF6/code first? I want to achieve something similar to the below, where Farm.Pigs returns a collection of animals whose type is equal to pig (but without loading the whole collection from the database first - and not storing them in a separate table). Is this possible? public class Farm { public int Id { get; set; } public virtual ICollection<Animal> Pigs { get; set; } public virtual ICollection<Animal> Cows { get; set; } } public