Entity Framework 6 - Knowledge Base (KB)
6940 results
Object context could not be created.
I'm getting the ...Unable to create object context... error when using Entity framework in ASP.NET MVC....Background...Every time I ...POST... to the controller I'm not getting a response back. I tried going directly to the method of the controller .../Da...
asked by Matt
In a LINQ-to-Entities query, how do you utilize a custom property?
I have a class ...Post... which is an ...Entity Framework... model. It contains a property like this:...public bool Showable { get { return this.Public && this.PublishedDate > DateTime.now } } ...I can use it in a query like this:...from p in db.P...
asked by pupeno
Connection string for EDMX
so the story is like this....I have a project, called PA.DLL, which have an entity model inside of it (edmx) file....In another project which i'm referencing to the PA.DLL, i copied the connection string that was created (automatically) when creating the...
asked by Or A
When utilizing EF4's POCO Template, you get the message "Metadata information not found."
I just installed the POCO Template for EF4. I have a single entity in my model, ...AnnouncementText..., and the T4 files seem to be properly generated. Attempting to access this new entity is throwing the following error when I access the auto-generated...
asked by ladenedge
A stored procedure in Entity Framework is not accessible.
I added a reference to a stored procedure in my edmx file, then right clicked on it and selected "Create Function Import", it was added to the Function Imports folder under EntityContainer in the model browser....As I understand it I should be able to use...
asked by jhunter
OLE DB Access Data Source using ADO.NET Entity Framework
Has anyone found a way to make the ADO.NET Entity Framework work with OLE DB or ODBC data sources? Specifically, I need to work with an Access database that for various reasons can't be upsized to SQL....This MSDN page... says:...The .NET Framework includ...
asked by Tim Long
How does Entity Framework handle recursive loading?
I have a tree structure in the DB with TreeNodes table. the table has nodeId, parentId and parameterId. in the EF, The structure is like TreeNode.Children where each child is a TreeNode... I also have a Tree table with contain id,name and rootNodeId....At...
asked by Avi Harush
In EF 4, use ApplyCurrentValues.
I just was playing with EF 4 in VS 2010 RC and just found that ApplyCurrentValues dont work when the Property is of type bool and the newly value is false !!!??? ... and it works when the newly value is true . ... I dont know if this is a bug or I'm mis...
asked by ali62b
What is the purpose of Entity Framework attempting to insert NULL?
I have two tables, Quote and Agent. Quote has a column called AgentID that is a foreign key in Agent....When adding the tables to my model in the VS the Quote class has a reference to Agent....When attempting to add a new quote I create a new quote entit...
asked by HitLikeAHammer
Changing the name of the Entity Framework Connection String
How do you change the name of the connection string that Entity Framework models are bound to by default?...Let's say I create an Entity Framework data model named "Model1.edmx" by pointing it to a databased named "MyDb" and picking some objects to map us...
asked by Derek Morrison
EntityFramework.NET: "On the provider connection, an issue occurred when beginning a transaction. Details may be found in the inner exception."
Using Entity Framework in .NET I want to loop through a list of items returned from the database and make updates. ...var qry = (from c in DBEntities.Customer select c); foreach (Object item in qry) { item.FirstName = .... ... etc, other code here ...
asked by CWinKY
With entity framework, you may save files to a database.
I have an ASP.NET MVC solution built on Entity Framework with Microsoft SQL Server 2008. I need to create a function that lets my users upload files. ...What I would like is:...A solution that uses the Entity Framework to store files in the Database...A s...
asked by Freddy
When the navigation property is null, Linq OrderBy fails.
Working with four tables....Users -> has basic user info including a userid and a departmentid (int)... Groups -> basic group info including a groupid... GroupsMembers -> table that has the relationship between a group and it's members, many to many relat...
asked by Steph
What are the advantages of using ADO.NET Entity Framework?
I was reading this article about ...ADO.NET Entity Framework... and found it to be very interesting though in the first shot I could not decipher many things. I am reading the article again in order to fathom the real logic behind this....a) A question cr...
asked by priyanka.bangalore
LINQ to Entity Framework using a MySQL adapter to convert String to Long
I have a table with a column of type ...varchar... where the majority of rows have numerical looking values, that is, each string contains nothing but the digits 0 through 9....+------+ | n | +------+ | 123 | | 234 | | BLAH | -- This row is an excep...
asked by Walt Stoneburner
How do you update the ObjectContext cache from the database?
We are loading data from db:...var somethings = Context.SomethingSet.ToList(); ...Then someone deletes or adds rows outside of context. Out context still has caches deleted object, because it doesn't know they were deleted. Even if I call Context.Somethin...
asked by LukLed
Snapshot vs. Self-tracking via WCF in EF4 POCO
Last year I developed a data access service for our project using Entity Framework (.NET3.5 of course) and using Julie Lerhman's book as a guide developed state tracking POCO objects. We use WCF and also have Silverlight 3 clients. We are moving to .NET 4...
asked by MrLane
The method ElementAt(i) is not recognized by LINQ to Entities.
I'm using the method ...elementat(Int32)... to get a specific element of a query's result....var mds = db.TDP_MissioniDestinazioni.Where(p => p.MissioneID == missioneRow.MissioneID); destinazioneRow = mds.ElementAt(i); ...LINQ to Entities does not reco...
asked by Luca Romagnoli
Implementation of the Entity Framework Specification Pattern
How-to implement Specification Pattern with Entity Framework ?
asked by Yoann. B
How to Get Parent Object with All Its Children in Entity Framework 4.0 using Code-First and POCO?
I'm new to EF 4.0, so maybe this is an easy question. I've got VS2010 RC and the latest EF CTP. I'm trying to implement the "Foreign Keys" code-first example on the EF Team's Design Blog, ...http://blogs.msdn.com/efdesign/archive/2009/10/12/code-only-furt...
asked by SirEel
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