Entity Framework 6 - Knowledge Base (KB)
6940 results
Entity Framework example apps that are good?
I am looking for some good asp.net sample applications which use Entity Framework. I saw a couple apps for NorthWind (one was MVC based). Looking for one with is more sophisticated than the simple apps at MSDN (HRSkillsCombined, CourseManager,AdWksSalesWi...
asked by Abdu
In TPH, ADO EF stands for Errors Mapping Associations between Derived Types.
Background...I am writing a data access library using the ADO Entity Framework in Visual Studio 2008 SP1 using the .NET Framework 3.5 SP1. I am trying to create associations between two entities that are both derived from an abstract type. I am representi...
asked by Zach Burlingame
For subtracting two dates, use LINQ to Entities.
I am trying to determine the number of days between 2 dates using LINQ with Entity Framework. It is telling me that it does not recognize Subtract on the System.TimeSpan class...Here is my where portion of the LINQ query....where ((DateTime.Now.Subtract(v...
asked by Michael I
Is there an Entity Framework in-memory provider?
I am unit testing code written against the ADO .NET Entity Framework. I would like to populate an in-memory database with rows, and make sure that my code retrieves them properly....I can mock the Entity Framework using Rhino Mocks, but that would not be ...
asked by Michael L Perry
Entity Model Function Imports 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
In Entity Framework, how can I utilize the default column value from a DataBase?
I have a Date column in table which has default value or binding as getutcdate(). I want to use this in entity framework.On generating EDM I was able to find "Default Value " property at column level but I think it is for hardcoded value. ...Please let me...
asked by Mak
Entity Framework WCF Contracts?
I've been coming up with a lot of dead ends on this question. Supposedly, .NET 3.5 SP1 has Support for ADO.NET Entity Framework entities in WCF contracts. But when I look for solid info on it I'm not getting a lot of answers. I found this one snippet on...
asked by Weej
How can I check for pending Entity Framework changes?
I'm creating an application with the ADO.NET Entity Framework....I can step through my code line-by-line while debugging and watch SQL Server Profiler for every query executed, but I can't figure out where all those SQL commands are coming from!...Sometim...
asked by Zack Peterson
VARBINARY and the Entity Framework
I’m using the .NET entity framework and I’ve got one entity containing a varbinary. Is there an easy way to get the size of the varbinary in the codebehind, efter it’s been retrieved from the database?...I’m thinking there might be some way to get...
asked by Marcus L
To pick an anonymous type, establish a LINQ Expression Tree.
I would like to generate the following select statement dynamically using expression trees:...var v = from c in Countries where c.City == "London" select new {c.Name, c.Population}; ...I have worked out how to generate...var v = from c in ...
asked by Tom Deloford
XML Files and Entity Framework
Can someone point me to a good tutorial explaining the Entity Framework using an XML file instead of a database? I have seen some good tutorials with SQL databases, but I can't make the leap to an XML file....Thanks!
asked by Tim
Entity Framework is a framework for creating entities. Another Navigation property's Include() navigation
I have an entity ...Test.... It contains a Navaigation Property ...Question... and ...Question... contains a Navigation Property ...QuestionLocale.......var test = context.Tests .Include("Question") .FirstOrDefault(); ...works as expected. B...
asked by chbu
How can "An entity object cannot be referenced by multiple instances of IEntityChangeTracker" be resolved?
I have a model in Ado.Net EF. I have a one to many relation and when I want to Add the entities I get the error..."An entity object cannot be referenceed by multiple instances of IEntityChangeTracker"...Any clue?...Something similar to ...Template templat...
asked by Mariano
Is Entity Framework compatible with ASP.NET Membership?
I'm creating (really, re-creating) an app that has existing user and other data in MS-Access databases. The data will be moved to SQL Server, and part of that involves migrating users. I want to use EF to do ORM, and I am pretty sure I know what the dat...
asked by oasasaurus
Entity framework objects should be updated.
I transfer data between the entity framework and the business layer and user layer by using Data Transfer Objects. I do have some doubt, if I retrieve an object which is converted to a DTO, how do I update the correct object in the entity framework and no...
asked by user75278
ADO.NET Entity Data Model template not available in Visual Studio 2008 SP1
I have installed Visual Studio Team System 2008 Architecture version: 9.0.30729.1 SP and Microsoft Net Framework 3.5 SP1....When I'm going to add a new item I can't find ADO.NET Entity Data Model template....What's happening?...Thanks!
asked by VansFannel
Use of the Entity Framework with WPF DataBinding best practices
I'm in the process of building my first real WPF application (i.e., the first intended to be used by someone besides me), and I'm still wrapping my head around the best way to do things in WPF. It's a fairly simple data access application using the still...
asked by Ken Smith
Is it possible to utilize a Model from another project in an ASP.NET MVC View?
I've got an ADO.NET Entity Framework class called Node in a WPF project. I want to use it in a different ASP.NET MVC project within the same solution....My Node controller:...Public Class NodeController Inherits System.Web.Mvc.Controller Functio...
asked by Zack Peterson
SQL Server Compact does not allow keys and values produced by the server.
I just started to play with the entity framework, so I decided to connect it to my existing SQL Server CE database. I have a table with an IDENTITY(1, 1) primary key but when I tried to add an entity, I've got the above-mentioned error....From ...MS Techn...
asked by Sergey Aldoukhov
Entity Framework update statement
Simple question, is it possible to achieve this query this with Entity Framework when updating one entity?...update test set value = value + 1 where id = 10
asked by Drevak
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