Entity Framework 6 - Knowledge Base (KB)
79 results for: in tag: visual-studio
Defining an Entity Framework 1:1 association
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
Function Imports in Entity Model with a non-Entity Return Type
I have a stored procedure in my Entity Data Model and added it to the function imports....Problem is... Visual Studio generates the function code in the model's code-behind if and only if I specify the return to be an entity type. ...Scalar and null retu...
asked by Robert Claypool
Entity Framework error - "The EntityContainer name must be unique"
We have a solution which consists of two projects - a console application project and a web application project. Each of these has an identical in schema, but differently named .edmx file used to access the same database....The console application runs as...
asked by ENX
Is there a better way to refresh Entity Models (*.edmx files)
I need to refresh a bunch of EDMX files in my solution. We have disected our tables into groups and each model represents one component or process. However, there are some overlapping tables, which means sometimes I need to refresh/update multiple Entit...
asked by Jeremiah
The EntityContainer name must be unique. An EntityContainer with the name 'Entities' is already defined
For a little background:...I have a DLL project with the following structure: ...Rivworks.Model (project) \Negotiation (folder) Model.edmx (model from DB #1) \NegotiationAutos (folder) Model.edmx (model from DB #2) ...I have mov...
asked by Keith Barrows
VS 2010 Server Explorer Database Showing No Tables
I'm working on a .Net application that needs to read from an Oracle 10g database behind Siebel. In VS 2010 Server Explorer, I've created a connection using the OracleClient type connector with a reference to the Oracle TNS service name as the "server nam...
asked by Andy
complus Exception code -532462766
Using visual studio 2010, entity framework 4.0, ADO.NET POCO Entity Generator...On the code lines:...MecDbEnt.Domains.AddObject(subject);...MecDbEnt.SaveChanges(); (on this line)...the application throws follow exception:...complus exception code -53246...
asked by Masna
The type or namespace name 'DbContext' could not be found
I am VERY new to ASP.NET MVC (3) and am having a hard time resolving a build error in Visual Studio:...The type or namespace name 'DbContext' could not be found (are you missing a using directive or an assembly reference?)...using System; using System.Col...
asked by Chris
Could not locate assembly "EntityFramework"
I've been working on this MVC 3 application on my home computer for a while now. I'm out of town on a different computer, so I got the project from my source control. This new computer didn't have MVC 3 yet, so I installed it after I copied the project to...
asked by Steven
DB Connection string in Web.config to use attached .mdf database won't work
The file neodb.mdf is in my App_Data folder and I can browse the database in the server explorer in visual studio, using built in SQLEXPRESS:...Currently trying to no avail:... <connectionStrings> <add name="EFDbContext" connectionString=".\SQLExpress...
asked by LaserBeak
The INSERT statement conflicted with the FOREIGN KEY constraint in Entity Framework
I have two table Subscription and PackageType. Subs has FK as PackageTypeId. Now when I am inserting a new record in Subscription table using EF 4.1 it is throwing an exception ...The INSERT statement conflicted with the FOREIGN KEY constraint ..."FK_Subs...
asked by user946393
Installing Entity Framework 4.2 in VS2010
Entity Framework templates and menu items generate errors in Visual Studio 2010 Ultimate on 64-bit XP....The "Reverse Engineer Code First" menu item in Visual Studio tells me that version 4.0.0.0 of System.Data.Entity.dll cannot be found in the GAC, as do...
asked by Paul
WCF & Entity Framework & SQL Server - "The underlying provider failed on Open"
I am successfully running tests through the the WCF Test Client, until I try to pull in data with Entity Framework....To make sure I'm not doing anything stupid, I downloaded the sample code from this tutorial, which is doing something similar: ...http://...
asked by iKode
MVC "Add Controller" is "Unable to Retrieve Metadata...Config System Failed to Initialize"
From scratch, I made a new solution with two projects: one was MVC 3 and the other a supporting EF 4.2 project. The whole thing builds successfully. From the MVC project I open the "Add Controller" dialogue and have it generate code based on the context...
asked by Brent Arias
The EntityFramework package is not installed on project
I am having trouble getting the EF to install on my very simple project called 'Match' (just now learning MVC, better late than never). The general context here is that I created the Model class with only 2 fields and now I want to change the Model class...
asked by user1016313
Would like to install Entity Framework 5 with VS2012 but I'm lost
I installed Visual Studio 2012 and migrated a project from Visual Studio 2010 with Entity Framework 4.3 and .Net Framework 4.0...Now I would like to reference Entity Framework 5.0 and .Net 4.5 ...BUT when I go to the Manage Nuget Package window and search...
asked by Bronzato
mySQL DataSource on Visual Studio 2012
I've been reading about mySQL DataSource and the ability to use mySQL with Entity Framework, but I can't really generate EF with mySQL without the use of the DataSource Dialog...How can I add mySQL Database to such dialog? ...This is what I have done so f...
asked by balexandre
Entity Framework generated classes are not in the namespace I require, is there a way of changing the namespace it uses without regenerating?
If I need to regenerate where should the namespace be specified. I am trying to use partial classes from within the Models namespace however they don't match....The simplified code fragment below is where the entity framework classes have been generated..
asked by John Fleming
Missing Entity Data Model in VS 2012
I cannot find the Entity Data Model under the 'Data' tab when adding a new item....I have looked at several questions and answers, information on this and none of the solutions have worked....I have repaired, uninstalled and reinstalled, installed the EF ...
asked by Michael
Error 175: The specified store provider cannot be found in the configuration, or is not valid
I just joined a project and installed Microsoft Visual Studio Professional 2012 Version 11.0.51106.01 and Microsoft SQL Server 2008 R2 on a 64-bit machine. ...Another team member is able to build the solution from his machine, but from my machine I get th...
asked by user2283561
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