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Questions tagged [objectcontext]

Core class within Entity Framework. Provides the methods to retrieve, query and manipulate entities within the entity model.

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Entity-framework 6.1 querystring and ObjectContext

I am new to Entity-framework and MVC and I am trying to make a Data Access Layer (separate layer). I am using VS 2013, Entity-framework 6.1.3 and MVC5. So far I have created Connection Helper class to connect to the database, but I need a little…
aadi1295
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where condition in include, how?

The code below is not working. I am getting exception "The Include path expression must refer to a navigation property defined on the type. Use dotted paths for reference navigation properties and the Select operator for collection navigation…
LP13
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Am I using and disposing Entity Framework's Object Context (per request) correctly?

I have a web application where I have just began to use Entity Framework. I read the beginners tutorials, and topics about benefits of object context per request for web apps. However, I am not sure my context is at the right place... I found this…
Flash_Back
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.Net Entity objectcontext thread error

I have an n-layered asp.net application which returns an object from my DAL to the BAL like so: public IEnumerable Get(SourceKey sk) { var query = from SourceKey in _dataContext.SourceKeys select SourceKey; if…
Chris Klepeis
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Database First Entity.Add(EntityObject WithAutoIncrementing Key)

I am using Entity-Framework Database First , I have my ObjectContext.Entity bound to a binding source which in turn is bound to my winforms controls. When I change text on my winforms controls it populates down to Current ObjectContext.Entity - I…
Ken
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How to set a value of a non-mapped parameter of an entity during fetch

I am using Database-First Entity Framework and I have modified Model.tt file a bit for my needs. Now, all of my entities are inherited from the following class: public class EntityBase { public string CreateUser { get; set; } public string…
user3021830
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Executing SQL query against DataBase for an unknown object in EntityFrameworks

Correct me if I am wrong about EntityFramewroks. As far as I understand, it is impossible to execute a query against the database when you do not know what results (objects) you are going to get in return because it needs to map the results to the…
Moscobutter
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Entity Framework with ASP.NET MVC. Updating entity problem

I'm trying to update an entity and its related entities as well. For instance, I have a class Car with a property Category and I want to change its Category. So, I have the following methods in the Controller: public ActionResult Edit(int id) { …
Kitaly
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Use of Undeclared Type 'AVCamViewController'

I'm new to the coding industry and am seriously struggling with Swift. I have a situation where I want to go from one page to another, but I keep getting an error of "use of undeclared type AVCamViewController. This is my code: @IBAction func…
RPMouton
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HttpContext to ObectContext Connection helper

I had this below connection helper class in Visual Studio 2010 public class ConnectionHelper : IConnectionHelper { public ObjectContext Connection { get { if (_connection == null &&…
aadi1295
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ADO.net, Check if ObjectContext is writeable

I have an embedded database in an asp.net mvc project. If I try to write to the file, I sometimes get a write failed exception because the SQL Server can't write to the file. How can I check an ObjectContext, if its writeable, without actually…
user287107
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Cannot Resolve Symbol Error When Calling SavingChanges

All, I am working from the following MSDN Article Yet I am getting: "Cannot resolve symbol SavingChanges" The call in question is: contextProxy.SavingChanges += new EventHandler(context_SavingChanges); contextProxy is of type: public class…
Slinky
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Overriding SaveChanges to Implement a Business Rule

I created a working solution, which overrides SaveChanges() but would like to know if there is a better, cleaner way to do this. I really don't like the switch statement. Below, I have described the problem and illustrated my full solution.…
Slinky
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Invalid SQL error on ObjectContext Query() -> Execute()

I am trying to update a table from inside my overridden SaveChanges(). This query: UPDATE NewClub SET LastActivityDate='5/19/2014 10:17:50 AM' WHERE Id=21 Getting this error The query syntax is not valid. Near identifier 'NewClub', line 1, column…
Slinky
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Round trip logging in entity framework

I know this is possible in Linq-to-Sql, is it possible to automatically log all queries made through a particular ObjectContext in entity framework? In particular, I'm interested in the number of queries that are run in the lifetime of the…
Paul
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