Entity Framework Tutorial - Knowledge Base (KB)
1255 results for: in tag: entity-framework
Check if there are any pending changes to be saved
Is there a way to find out whether there are unsaved changes in my entity context, in the Entity Framework?
asked by Palantir
Table-per-type inheritance with EF 4.1 Fluent Code First
I have a pretty straight forward set of database tables, like:...Vehicle Id RegNo Car Id (FK of Vehicle.Id) OtherStuff Bike Id (FK of Vehicle.Id) MoreStuff ...My class model is as you'd expect: with Vehicle being an abstract class, and then Car an...
asked by nbevans
EF code-first: How to load related data (parent-child-grandchild)?
I have this entity:...public class DynamicPage { public int PageId { get; set; } public int Order { get; set; } public string MenuText { get; set; } public string MenuHover { get; set; } public int? ParentId { get; set; } pub...
asked by javad amiry
async-await issue in EF 6
I'm trying async-await programming with entity-framework 6 (code first) + WPF and I can't see why the UI still freezes after I made the code asynchronous. Here is what I'm doing from the very first line:...first there is an event handler responding to a c...
asked by Vahid
Entity Framework 6 Code First Migration's ContextKey
Now i'm using EF6 Alpha, and when using migration, it will add a new migration log into the __MigrationHistory table....In EF6, The __MigrationHistory table has a new column called "ContextKey". After testing, I found there are two default "ContextKey" va...
asked by RongieZeng
Can't update database using EF Migrations after updating to EF 6.0.0-alpha
After updating my Entity Framework to version 6.0.0-alpha1 I cant update database. This is the error I'm getting:...PM> update-database -verbose Using StartUp project 'DataCenter'. Using NuGet project 'DataCenter.Domain'. Specify the '-Verbose' flag to vi...
asked by Mahmoodvcs
Entity Framework 6: Right usage of "Custom Code First Conventions" Feature?
My requirement is configuing the string length mapping globally, but also can use MaxLengthAttribute to configue a property specially. Here's my code:...public class StringLengthConvention : IConfigurationConvention<PropertyInfo, StringPropertyConfigurati...
asked by RongieZeng
Entity Framework Provider type could not be loaded?
I am trying to run my tests on TeamCity which is currently installed on my machine....System.InvalidOperationException...: ...The Entity Framework provider type '...System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer..., ...Ver...
asked by ashutosh raina
EntityFramework 6 Alpha 2 & MySQL Connector/NET 6.6.4
The 6.6.4 MySQL .NET connector apparently has support for EF6. I've upgraded from EF5 and .NET 4 to EF6 alpha2 and .NET 4.5. I've recreated the ADO.NET Entity Data Model since upgrading....Upon doing anything to the database it throws up an exception mess...
asked by pierce
Entity Framework 6 + SQLite
I'm trying to use EF6 alpha and SQLite 1.0.66.0...My .config file:...<connectionStrings> <add connectionString="data source=:memory:;" name="TestDbContext" providerName="System.Data.SQLite" /> </connectionStrings> <entityFramework> <providers> ...
asked by nmulyukin
How to get original Entity from ChangeTracker
Is there a way to get the original Entity itself from the ...ChangeTracker... (rather than just the original values)?...If the ...State... is ...Modified..., then I suppose I could do this:...// Get the DbEntityEntry from the DbContext.ChangeTracker... /...
asked by Eric
EF6 alpha Async Await on an Entity Stored Procedure / Function Import?
I'd like to apply the new async await functionality to Stored Procedures / Function Imports imported in my Entity model, but have as yet been unable to with the EF6 alpha....Is it yet possible in EF6 alpha2 (or the nightly build as of 20211) to call any o...
asked by blueFish
Error deploying to SQL Azure using EF 6 alpha3 Code First and Migrations creating __MigrationHistory table
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 ...
asked by Bruno Moscão
Entity Framework and Migration with multiple schemas in a single Context
I am developing a multi-tenant application with Entity Framework Code First. Each tenant will have a different schema in the database, but the application will have a single Context and model for all tenants. ...The Entity Framwork 6 is able to use multi...
asked by Bruno Albano de Souza
Entity Framework 6 Custom Relationship Convention
I have read ...this... documentation about convention in Entity Framework 6. But it does not contain convention for Relationship. ...Suppose I have following model:...[TablePrefix("mst")] public class Guru { public int Id { get; set; } public int...
asked by Niyoko Yuliawan
Is there an planned release date for Entity Framework 6?
My question says it all, but here's some background:...Due to various constraints I'm stuck on .NET 4.0 until at least July 2014. However, I'm tasked with converting our DAL to use Entity Framework for help with scalability and performance. Currently we...
asked by Kim
How do I remove underscore of foreign key fields in code first by convention
I've got multiple classes (including TPT) in my project. Each POCO has a ...BaseClass..., which has a ...GUID... (called ...GlobalKey...) as primary key....First I used ...DataAnnotations... to create correct foreign keys. But then I've got problems synch...
asked by Andreas Geier
Connecting to SQL Server with EF6
Up to EF5, in order to connect to SQL Server 2012, all I needed to to is specify a connection string that looks something like this:...Data Source=.\SqlExpress;Initial Catalog=MyDatabase;Integrated security=True;MultipleActiveResultSets=True ...This metho...
asked by Goran
Error "Failed to set database initializer of type MyNamespace.MyCustomInitializer, MyAssembly" could not load MyContext type
I'm creating a web app using .NET4.5 with Entity Framework 6 alpha3 that uses a new SQL Compact database. The database does not yet exist....I have the following code in a web form:...public IQueryable<Job> listJobs_GetData() { var db = new Journalist...
asked by Mark Shaw
What is the correct use of IDatabaseInitializer in EF?
I have a custom DatabaseInitialiser which is below.../// <summary> /// Implements the IDatabaseInitializer to provide a custom database initialisation for the context. /// </summary> /// <typeparam name="TContext">TContext is the DbContext</typeparam> pub...
asked by ashutosh raina
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