ADO.NET :: Entity Frame Work Make Use Of Linq To Entities?
Mar 6, 2011can we say like "Entity frame work make use of linq to entities"?
what is the relation between linq qnd entity frame work?
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[Code]...
Simplify LINQ-To-Entity Query, And Make It Dynamic
Dec 4, 2010I have this query for getting data through Entity Framework, which works today. Thing is, i want to create the query dynamically, i.e build it up in blocks, but i can't figure out how exactly to do it. I believe if i can somehow save one of the values that i retrieve in the beginning i can do it, but now i retrieve it twice (probably a bit slow as well? Unless the compiler fixes it before quering). Makes sense? Here is the LINQ:
[code]....
I.e based on if various variables have values.
C# And .NET Frame Work 1 Compatibility
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Entity Framework 4 Merge Changes Between Two Entities?
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View 3 RepliesInheritance With POCO Entities In Entity Framework 4?
Mar 12, 2010I have a Consumer class and a BillableConsumer : Consumer class. When trying to do any operation on my "Consumers" set, I get the error message "Object mapping could not be found for Type with identity Models.BillableConsumer.
From the CSDL:
[code]....
Is this because I did not specifically add the BillableConsumer entity to the object set? How do I do that in a POCO scenario?
DataSource Controls :: Is There A Way To Connect Two Entities Together In One New Entity
May 22, 2010And not doing a View that connect two tables ?Is there a way to connect two entities together in one new entity?
View 1 RepliesC# - Get Data From Entities That Inherit Others In Entity Framework 4.0?
Oct 19, 2010Due to the way the database was designed, in my model I have a User entity. The Contact entity inherits from the user entity, and the Profile entity inherits from the Contact entity.
How can I get a list of Profiles, and, how do I create a Profile?
ModalPopupExtender Doesn't Work On IE6 Frame Layout
Jun 15, 2010I'm using a "frame" layout similar to the one in this excellent answer: a div #top at the top of the page, a div#left on the left, and a div #main with the main content. The #top and #left divs contain navigation menus.Now I want to use a popup div using the AjaxControlToolkit ModalPopupExtender inside the content (#main) div.This works fine on IE8 (where #top, #left, #main all have position:fixed), but when I run it on IE6, the modal background only covers the #main div - I need it to cover the whole of the page including the #top and #left navigation divs.
View 1 RepliesInstallation :: .net Frame Work 3.5 Sp1 With Windows 7 Ultimate?
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I download .net frame Work but the setup can't run it disapperars after some seconds.....
I need to update .net frame work 3.5 to .net frame work 3.5 sp1 for the new features of 3.5 sp1 like Entity Frame Work.
Storing Entity Framework Self Tracking Entities In Session
Aug 13, 2010let us assume that I have a reusable business layer that further makes use of a data access layer that was implemented using Entity Framework 4.0. The entities returned/consumed by the business layer are self-tracking, allowing us all the goodies that come with those type of entities. I would like to be able to store the entities I work with across post backs (on order to avoid re-querying every time). Basically let us assume I have a paged GridView with 10 items in it, and something like a DetailsView to edit those items. Every time you select a new row on the grid, the details view updates with the information of the selected row. My preference would be to only query for the entities on the initial request of the page and store it in session. Then subsequently I have a list of entities that I can work with and eventually modify and send back to the business layer with all of the changes.
I really want to use session instead of view state to reduce the page payload (self tracking entities are heavy) however I really like view state for this because of the fact that when the user navigates away from the page there is no residual effect. Some of the things that worry me are: When a user navigates away from the page to another page, the entities from the previous page are still in session. I could always do something on load of a page to do housekeeping type of work. Not sure if that's good practice. I am worried about people opening browser tabs and having two views into the same page, it seems like that might pose a problem. Is this even a good approach? Seems like I am trying to have the best of all worlds, it would definitely be much easier to simply re-query on every post back for the entities and pay the 50-100ms hit of the database trip.
Entity Framework - Use Of Self-Tracking Entities In Across Multiple Posts
Dec 14, 2010I have a model that consists of Order, OrderLine, Product.
I want to create an Order and add OrderLines (each OrderLine related to a Product). I create the Order and add new OrderLines to it. Between posts I store the Order entity in Session (or ViewState). Just so you know I have added suppport for binary serialisation which works fine.
The relationship is therefore Order > OrderLine(s) > Product(s).
You might have already guessed what the problem is - that when I SaveChanges() I get the usual 'AcceptChanges cannot continue because the object's key values conflict with another object in the ObjectStateManager.' error.
I have referred to a number of articles online but none seem to handle this case (where I have the relationship across more than two entities) e.g. [URL].
This must be a very common requirement surely? Is there anyone out there doing the same kind of thing with Entity Framework (and without using DTOs etc)?
AJAX :: Control While Upgrading Website From 3.5 To 4.0 Frame Work
Oct 1, 2010i am working on asp.net website.
on my web page i submit some data on click at button , this block is inside update panel.
this functionality working fine in 3.5 frame work.
Now our website is using 4.0 frame work.
controls inside update panel giving following error on submting data :
Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500.
C# - Usage Of Server Side Controls In MVC Frame Work?
Dec 20, 2010I am using ASP.Net 4.0 and MVC 2.0 for an web application. As my project requiremrnt I have to use the server side control in my application which is not possibl in noraml case. Ideally I want to use AdRotator control and DataList control.I saw few samples and references in CodePleax MVC ControlLib howwver I found it is very less useful. Can someone tell how to utilize theese controls in ASP.Net application along with MVC. Note: Please provide functionalities related to the AdRotator and DataList controls not the equivalent functionalities
View 2 RepliesHow To Avoid Clashes With Existing Entity ID's When Deserializing And Importing EF Entities
Feb 11, 2011I have an ASP.NET 4 web app that is using the Entity Framework to hold, amongst other things, a hierarchical structure of items that is used for features such as navigation.
One of the functions of the application allows the export of a particular branch of the hierarchy tree to XML, generated using a DataContractSerializer. Once exported, the intention is that the XML can then be uploaded to another instance of the same app, deserialized back into EF objects and then added to the data model on the second server.
When I try and import data in this way, I'm finding that I see the following error:
The object could not be added or attached because its EntityReference has an EntityKey property value that does not match the EntityKey for this object.
Taking a closer look at the XML that is generated by the serializer, I can see that the entity key is among the items that has been serialized. Since I'm importing entities that originate from a different database, some of the ID's clash.
What I'd ideally like to be able to do (unless I'm missing something here) is attach the imported entities to an object context and reset the ID's of the objects being imported.
Is there a smart way to do this? Do I simply have to set the ID for each of my imported entities to 0, attach them to the object context and then save changes?
ADO.NET :: Use SP With Linq To Entities?
Sep 25, 2010How to use Stored Procedures with Linq to Entities? I prefer an example with input and output The videos on asp.net only show how to do this with Linq to SQL.
View 5 RepliesSql To Linq To Entities
May 13, 2010I have a simple join:
SELECT * FROM MessageAlerts AS A LEFT OUTER JOIN Contacts AS C ON A.ContactId = C.Id LEFT OUTER JOIN
Users AS U ON A.UserId = U.Id INNER JOIN Businesses AS B ON B.Id = C.BusinessId OR B.UserId = U.Id
how to do this : ON B.Id = C.BusinessId OR B.UserId = U.Id with linq in entity framework.
C# - Order A List Of Entities Based On A Field From A Separate Entity With A Relationship
Mar 6, 2011I'm using Entity Framework for my object-relational mapping, and jqGrid for my grid.
I have an Employee entity, that contains a ContactID field. I have a Contact entity that contains fields FirstName and LastName.
I want to display a list of Employees in a grid, and give the user the ability to sort by FirstName and LastName.
Here's what I have right now:
public JsonResult GridData(string sidx, string sord, int page, int rows)
{
var pageIndex = Convert.ToInt32(page) - 1;
var pageSize = rows;
var totalRecords = GetAllEmployees().Count();
var totalPages = (int)Math.Ceiling(totalRecords / (float)pageSize);
IQueryable<Employee> employees = GetAllEmployees().
OrderBy(sidx + " " + sord).
Skip(pageIndex * pageSize).
Take(pageSize).ToArray();
}
As you can see, this only gives me the ability to sort by fields in the Employee entity, so I can't sort by FirstName and LastName.
How can I modify this to accomplish that?
DataSource Controls :: Best Way To Handle Inserts For Entities When Using FormViews And Entity Framework 4?
Mar 3, 2010I am trying to get some guidance with this issue:
I have a Customer object that has two address ID fields (one for HomeAddress and one for WorkAddress)
I am loading the Address Objects by using Include="HomeAddress, WorkAddress" and then binding to the properties using the Navigation Property on the Customer Entity
Can I use just one FormView for doing the Insert/Updates and binding it to an EntityDataSource or would I have to do all the Inserting/Updating manually?
Web Forms :: Response.Redirect With Frame Work 4.0 / No Longer Funchtions And Returns
May 21, 2010We have an aplication which works fine withing ASP 2.0 .NET Framework 3.5. Its a response. redirect call from inside ajax update panel, and it can not be outside. After updating to Framework 4.0 it no longer funchtions and returns "Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed." without redirecting.
Server.trasfer gves the same error as well as and does not work
Entity Framework - Dynamic Data IS Showing Primary Keys For Every Table When Using Entities
Feb 4, 2010Using a very run-of-the-mill database, with identity int for primary keys, a Dynamic Data Entities Project (EntityFramework) displays the primary key for view and edit. When using Linq to Sql, the primary key fields are not displayed.
I would like to hide the primary keys and use Entity Framework (VS 2008, .Net 3.5 sp1).
MVC :: What E Position Is For Linq To Entities 2 SQL
Jan 27, 2010WHY are all the examples on this site linq to SQL? Did ms not themselves announce dropping support for l2SQL over a year ago? i really don't get it. Examples are great.. but really not helping me since i've gone ahead and listened to MS. And can someone at MS clarify what the position is for linq 2 SQL.. Is it supported? Recommended? What the hell.
View 7 RepliesADO.NET :: Structure The BLL Using LINQ To Entities?
Nov 10, 2010I am trying to learn LINQ to entities, and am working out how to best structure my BLL layer. I have generated the entity model and have created a generic repository in my DAL that returns results as IList<T>. I initially created the BLL to also return
results as IList<T>:
public IList<DAL.Customer> SelectAll()
{ [code]...
Now I am working on the aspx page, and I can create an ObjectDataSource and configure it to use my BLL, but since I am returning IList, I can't sort since I am not using a DataView. I have seen some articles on the web for converting IList to DataView, but that seems like a lot of overhead for every query.My goal is to keep a clean separation between layers without making things overly complicated. I would like to know how others have done this, or maybe a link to a good tutorial that shows how to structure all three layers.
