Entity Framework 6 - Knowledge Base (KB)
6940 results
LINQ to SQL vs. Entity Framework
Now that .NET v3.5 SP1 has been released (along with VS2008 SP1), we now have access to the .NET entity framework....My question is this. When trying to decide between using the Entity Framework and LINQ to SQL as an ORM, what's the difference?...The way...
asked by Chris Roberts
Expression. How do I invoke Entity Framework?
The Entity Framework does not support the ...Expression.Invoke... operator. You receive the following exception when trying to use it:..."The LINQ expression node type 'Invoke' is not supported in LINQ to Entities....Has anyone got a workaround for this ...
asked by Brad Leach
In Entity Framework, update the database schema.
I installed VS SP1 and played around with Entity Framework....I created a schema from an existing database and tried some basic operations....Most of it went well, except the database schema update....I changed the database in every basic way:...added a n...
asked by Biri
NHibernate vs. ADO.NET Entity Framework
So the ADO.NET Entity Framework has gotten a little bit of bad press (in the form of blog entries and a petition) but I don't want to rush to judgement. I'm limited in time for experimentation but I was wondering has anyone worked with it yet with more em...
asked by t3rse
Linq to Entities vs. ESQL Performance
When using the Entity Framework, does ESQL perform better than Linq to Entities?...I'd prefer to use Linq to Entities (mainly because of the strong-type checking), but some of my other team members are citing performance as a reason to use ESQL. I would l...
asked by Brad Leach
Entity Framework for ADO.NET tutorials
Does anyone know of any good tutorials on ADO.NET Entity Framework?...There are a few useful links here at ...Stack OverFlow..., and I've found one tutorial at ...Jason's DotNet Architecture Blog..., but can anyone recommend any other good tutorials? Any...
asked by Yngvar Johnsen
Using Entity Framework with MySQL
Can't find anything relevant about Entity Framework/MySQL on Google so I'm hoping someone knows about it.
asked by vintana
Is Microsoft Entity Framework compatible with Oracle?
Is it possible to use Microsoft Entity Framework with Oracle database?
asked by Xerx
Building where clauses to evaluate collections inside a many to many connection using LINQ to entities
So, I am using the Linq entity framework. I have 2 entities: ...Content... and ...Tag.... They are in a many-to-many relationship with one another. ...Content... can have many ...Tags... and ...Tag... can have many ...Contents.... So I am trying to write ...
asked by Phobis
Identity columns with ADO.NET Entity Framework
Is the Entity Framework aware of identity columns? ...I am using SQL Server 2005 Express Edition and have several tables where the primary key is an identity column. when I use these tables to create an entity model and use the model in conjunction with a...
asked by matthew thomas
How to use the Entity Framework to connect items from different contexts.
I am ...very... new to the entity framework, so please bear with me......How can I relate two objects from different contexts together?...The example below throws the following exception:...System.InvalidOperationException: The relationship between the ...
asked by Giovanni Galbo
What are some alternatives to expanding in a LINQ to ADO.net Data Service query?
I am wondering if there are any alternatives to using the Expand key word when performing an LINQ to ADO.net Data Services query. The expand method does get me the data I am interested in, but it requires me to know all of the sub-objects that I am going...
asked by ChrisHDog
In C#, get the name of a class as a string.
Is there a way to take a class name and convert it to a string in C#? ...As part of the Entity Framework, the .Include method takes in a dot-delimited list of strings to join on when performing a query. I have the class model of what I want to join, and f...
asked by Jared
Validation of Entity Framework
I'm getting ready to start a new project and I've been researching the entity framework. My question is what is the best strategy for validating the entities? Other projects I've worked on have used attributes for most of the validation, but obviously thi...
asked by Micah
How can I use the Entity Framework to establish foreign key relationships?
I want to create a new row in my database on a table that has a couple of foreign key relationships and I haven't been able to get a handle on what order and what calls need to be made. This is what I have so far:...db.Models.Order order = DB.Models.Order...
asked by Jared
Entity Framework could not be saved. Inherited characteristics
I have implemented some table-per-type inheritance in my data model (basically have a ...BaseEntity... type with all the base information for my items and a ...Employer... type that inherits from the ...BaseEntity... item). Everything appears to be set u...
asked by ChrisHDog
Using entities from Entity Framework as business objects?
I'm using Entity Framework O/R mapper from Microsoft and using entity classes (generated classes that are mapped to DB objects) as a business objects. Is this OK? Please state your cons or pros. What to do in a case of WCF communication between business ...
asked by Aleksandar
What is the best way to create a Linq Expression Tree that compares to a generic object?
I have an IQueryable and an object of type T....I want to do IQueryable().Where(o => o.GetProperty(fieldName) == objectOfTypeT.GetProperty(fieldName))...so ......public IQueryable<T> DoWork<T>(string fieldName) where T : EntityObject { ... T...
asked by JTew
Performance of Linq To SQL versus Entity Framework
I have been searching for recent performance benchmarks that compare L2S and EF and couldnt find any that tested calling stored procedures using the released version of EF. So, I ran some of my own tests and found some interesting results....Do these resu...
asked by Vyrotek
How can I utilize LINQ to Entities with a WPF TreeView HierarchicalDataTemplate?
I've got a Page class in my .edmx ADO.NET Entity Data Model file with with Parent and Children properties. It's for a hierarchy of Pages....removed dead ImageShack link - ADO.NET Entity Framework Hierarchical Page Class...This is handled in my SQL databa...
asked by Zack Peterson
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