Entity Framework 6 - Knowledge Base (KB)
6940 results
Instead of "Generate Database from Model," Entitiy Framework uses "Update Database from Model."
I have created a Entity Framework 4 model with Visual Studio 2010 and generated a database from it. Now I found myself adding new properties (with default values), changing documentation of columns, changing names of columns, changing types of columns sev...
asked by David
Entity framework MappingException: 'XXX' has been mapped several times.
I'm using Entity framework in web application. ObjectContext is created per request (using HttpContext), hereby code:...string ocKey = "ocm_" + HttpContext.Current.GetHashCode().ToString(); if (!HttpContext.Current.Items.Contains(ocKey)) { HttpContext...
asked by Michal
Exception code -532462766 complus
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
Large-scale application architecture in C#
Can you please tell me some tutorials/books about thinking a large application in c#. I have worked with 3 tier, but i need something more specific:...a way to design panels, so that for specific users specific panels will load and specific dlls a databas...
asked by psu
In MVC2 Entity Framework 4, server-side validation of a REQUIRED String Property does not function.
I'm trying to get server-side validation of an Entity Framework String Property to work. Other server-side validation such as data type validation and required dateTime and numeric EF properties are working. ...This in VS 2010, .Net 4.0, MVC2 + Cloud, ADO...
asked by HackITMngr
Check for any modifications that need to be saved.
Is there a way to find out whether there are unsaved changes in my entity context, in the Entity Framework?
asked by Palantir
EF4 and ASP.Net MVC LINQ - Join Two Entities into One IQueryable Complex Type
I have code like:... var entityX = this._xService.GetAll(); var entityY = this._yService.GetAll(); ...Both are returned as IEnumerable types. I need to inner join the two into a something like a JoinedList class that has to be IQueryable....I'm looking f...
asked by Ted
Get a Date from DateTime using Linq to Entity.
var islemList = (from isl in entities.Islemler where (...isl.KayitTarihi.Date... >= dbas && isl....KayitTarihi.Value.Date... <= dbit) select isl);...It gives error: date is not supported in LINQ to Entities... How can i get date in linq.
asked by serkan
Auto increment, C#, entity framework
I'm learning Entity Framework under VC# 2010....I have created a simple table for learning purposes, one of the fields is "id" type integer, identity set to true. I've generated Entity Data Model from that table and connected it with dataGridView. The pro...
asked by migajek
Is it possible to convert an entity to a.csv file quickly?
at present, I have:... string outputRow = string.Empty; foreach (var entityObject in entityObjects) { outputRow = entityObject.field1 + "," + entityObject.Field2 etc.... } ...I'm still new to the Entity Framewor...
asked by KevinDeus
In the foreach loop, use DeleteObject().
With Entity Framework, I try to delete some objects from my object context like that :...foreach (var item in context.Items.Where( i => i.Value > 50 ) ) { context.Items.DeleteObject(item); } ...With this code, I have a "Collection Was Modified" Excepti...
asked by Patrice Pezillier
Using Entity Framework to insert many rows into a table
I’m having fun with EF and have come unstuck....Originally I used the following bit of code using standard linq that essentially enters some data into a table....ManagePreferencesDataContext manpref = new ManagePreferencesDataContext(); ...
asked by Ricardo Deano
SaveChanges() in Entity Framework not working?
I use entity framework with Visual Studio 2008, sure it was SP1 both .NET Framework and VS itself. My application is develop in n-tier environment. First step I convert data from context to collection and serialize to user....HRMSDBContext context = new H...
asked by Anonymous
Using Entity Framework to run a custom query
I want to execute custom query to get datetime of DB server ...select Getdate()... using entity framework. How can I do this?...Thanks
asked by Muhammad Akhtar
Entity Framework adds a new object to the ObjectContext in C#.
im working with Entity Framework, SQL and C#....i have a Table called Client and other called clients_phone....I have a form with a Xtragrid and using BindingSource I bind the IQueryable to the grid....myBindingSource = new BindingSource(); myBindingSourc...
asked by Mark Comix
Obtaining all Entity Framework updates made to an object
Is there a way to get all the changes made to a object in the Entity Framework before it saves all changes. The reason for this is that i want to create a log table in our clients database:...so......Is there a way to get the current database values(old) ...
asked by Willem
Transactions and the.NET Entity Framework
Being new to the Entity Framework, I'm really rather stuck on how to proceed with this set of issues. On the project I am currently working on, the entire site is heavily integrated with the EF model. At first, the access to the EF context was being contr...
asked by sicknote
On Records, Entity Framework calls MAX on null.
When calling Max() on an IQueryable and there are zero records I get the following exception....The cast to value type 'Int32' failed because the materialized value is null. Either the result type's generic parameter or the query must use a nullable type...
asked by bleevo
Trying to choose between NHibernate and Entity Framework?
What are the main advantages and disadvantages of NHibernate and Entity Framework 4.0?...(While tagging my question, I've noticed more NHibernate tags than EF. Is NHibernate more popular?)
asked by Sahat Yalkabov
Error: A query's result can't be enumerated more than once.
Call SP in EF 4.0 in following code:... public IQueryable<Employee> GetEmployeesByFollowup() { var results = from p in this.ObjectContext.SearchEmployeeFollowup() select p; foreach (Employee p in ...
asked by KentZhou
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