Entity Framework 6 - Knowledge Base (KB)
6940 results
In the ADO entity framework, the association end is not mapped.
I am just starting out with ADO.net Entity Framework I have mapped two tables together and receive the following error:...Error 1 Error 11010: Association End 'OperatorAccess' is not mapped. E:\Visual Studio\projects\Brandi II\Brandi II\Hospitals.e...
asked by Sean
The object could not be destroyed because it did not exist in the ObjectStateManager.
Trying to get a handle on Entity Framework here and I am hitting some speed bumps... I have a Get() method that works fine and has been tested, but my Delete method is not working:... public static void Delete(string name) { J1Entities db = ...
asked by naspinski
Entity Framework: Is it possible to use transactions and rollbacks?
Issue: (With Sql 2005)...How can I query the database while the transaction is up? (Since it locks the table)...How can cause a transaction to rollback and then close itself to allow the table to be queried?...So I found this much:...[TestMethod] public v...
asked by Programmin Tool
Is it possible to export the.edmx diagram from Visual Studio 2008 to Visio?
Some people want to see the DB structure and dont have VS, is there a way to do this? Or any other way to export it outside of a screencapture (it is a huge diagram)....Thank you.
asked by naspinski
Working with Detached Entities in Entity Framework
Ok, so in this example I have a parent entity called Template. A Template always has a type. The type is an FK that is very likely to already exist. The problem comes when creating a new Template and adding to it the type. Once the type is added and you g...
asked by Michael M.
How do I make the ADO.NET Entity Framework regenerate code?
I've run into a snag with a ADO.NET Entity Framework model and a ADO.NET Data Service that is making it available. The model and data service are compiling without any problems or warnings when they come out of source control. However when I run the ser...
asked by Ken Henderson
Creating an Entity Framework 1:1 relationship
I'm trying to define a 1:1 association between two entities (one maps to a table and the other to a view - using DefinedQuery) in an Entity Framework model. When trying to define the mapping for this in the designer, it makes me choose the (1) table or v...
asked by Craig Fisher
Why is a metadata property required for an Entity Framework Connection?
I switched my DAL from using LINQ over to Entity Framework. Because my application connects to different databases depending on the current user, I need to dynamically create the DataContext at run time and pass in the appropriate connection string. How...
asked by John Bubriski
How can I remove an object from an Entity Framework model without having to load it first?
I am quite sure I've seen the answer to this question somewhere, but as I couldn't find it with a couple of searches on SO or google, I ask it again anyway......In Entity Framework, the only way to delete a data object seems to be ...MyEntityModel ent = n...
asked by Tomas Aschan
When to Avoid Using Entity Framework
I have been playing around with the EF to see what it can handle. Also many articles and posts explain the various scenarios in which the EF can be used, however if miss the "con" side somehow. Now my question is, ...in what kind of scenarios should I sta...
asked by driAn
How can I utilize ADO.net Entity Framework with a SQLConnection that already exists?
I have an existing asp.net website that uses an SqlConnection....I have added the ADO.net Entity Framework....I have successfully connected to the database and created the .edmx file....I am able to connect through the Entity Framework with the connection...
asked by EZ.
Where Predicate Type Arguments in C#
I have an XElement with values for mock data. ...I have an expression to query the xml:...Expression<Func<XElement, bool>> simpleXmlFunction = b => int.Parse(b.Element("FooId").Value) == 12; ...used in:...var simpleXml = xml.Elements("Foo").Where(si...
asked by blu
Dynamic Where Clause in Entity Framework
I have a query like:...var function = GetSomeExpression(); using (FooModel context = new FooModel()) { var bar = context.Bar.Where(function); } ...I'd like to make a generic method that can execute Where against different Entities in the context....
asked by blu
How do you use Linq to ADO.NET entity framework to do full text search (FTS)?
Now that SQL Server 2008 has full text search built in. I'm looking to use it to power my website's search. I'm also looking at using ADO.NET entity framework for my ORM but I was wondering how do you do full text search (FTS) with Linq to ADO.NET entity ...
asked by ajma
Parent Navigation Property C# Expression Tree Parameter
How can I create a ParameterExpression for the parent side of a 1 to * Navigation Property?...The following works for the child entity:...var parameter = Expression.Parameter( typeof(T), // where T is the entity type GetParameterName()); // helper...
asked by blu
The Update Wizard in ADO.NET Entity Framework does not add tables.
I ...added a new ADO.Net Entity Data Model... into my project and used the ...Update Wizard... to add tables into the model. Five of the selected tables were added to the design surface. Two other tables will not add. I select them in the wizard and cl...
asked by Robert Claypool
ADO.NET Entity Framework Stored Procedures
I'm trying to use a stored procedure in the entity framework. I had the model created initially without the stored proc. I then went into Update Model from Database and selected the stored procedure I wanted and then added it through the function import. ...
asked by Satish
When dealing with Entity Framework, what are effective design practices?
This will apply mostly for an asp.net application where the data is not accessed via soa. Meaning that you get access to the objects loaded from the framework, not Transfer Objects, although some recommendation still apply. ...This is a community post, so...
asked by ADB
SQLite + Entity Framework deployment
I have a ASP.NET MVC app that is using SQLite database through Entity Framework. Everything works on VS 2008's local development webserver....However, deploying the web app to my service provider causes this error:...[ArgumentException: Unable to find the...
asked by Pompair
Is Entity Framework and a large number of queries unusable?
I'm trying EF out and I do a lot of filtering based on many to many relationships. For instance I have persons, locations and a personlocation table to link the two. I also have a role and personrole table. ...EDIT: Tables: Person (personid, name) Perso...
asked by John Landheer
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