ADO.NET :: Lazy Loading Entity Framework?
Jan 27, 2011Does the entity framework come with some inbuilt mechanism for lazy loading?
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C# - Dynamically Loading SQL Tables In Entity Framework?
Feb 18, 2011I need to dynamically access some SQL tables hopefully using the Entity Framework. Here's some pseudo code:
var Account = DB.Accounts.SingleOrDefault(x => x.ID == 12345);
which will return me an Account object and this contains some fields called "PREFIX", "CAMPAIGN ID" and further information about the accounts are stored in separate SQL tables with the naming convention of PREFIX_CAMPAIGNID_MAIN.
The tables all have the same fields so I was thinking of creating a new Entity that isn't mapped anywhere and then dynamically loading it, like so:
var STA01_MAIN = new MyAccount(); // my "un-mapped" entity
DB.LoadTable('STA01_MAIN').LoadInto(STA01_MAIN);
I can now get anything about the STA01_MAIN account: STA01_MAIN.AccountId. So my question is: how do I access these tables using the Entity Framework?
C# - Loading A Nested Repeater With Data From 2 Entity Framework Queries?
Jan 20, 2010I have 2 tables A and B that have a many to many relationship. I am using nested repeaters to show the data in a web page. My issue is, how do I write an ObjectQuery or an IQueryable query that returns the parent rows in A and the child rows in B so that I can use them as my data sources for my inner and out repeater. I have the code I wrote so far below but I am not sure if it is correct or even close.
<asp:Repeater ID="A" runat="server"><br/>
<ItemTemplate><br/>
<h2 class="Information"><br/>
[code]...
.net - Lazy Loading Using Updatepanel And Timer In C#?
Mar 25, 2011After loading updatepanel through Timer, i am unable to make any async request from the updatepanel.
sample aspx Code:
<asp:UpdatePanel runat="server" UpdateMode="Conditional">
<ContentTemplate>
<%--The Timer that causes the partial postback--%>
<asp:Timer runat="server" Interval="100" OnTick="Timer_Tick" Id="Timer1"/>
<asp:ImageButton ID="btnSaveEmployeePrevJobs" runat="server" ImageAlign="AbsBottom"
ImageUrl="~/Images/saveOff.gif" onmouseout="this.src='../Images/saveOff.gif'"
[Code]....
AJAX :: Jquery Tabs Do Lazy Loading?
Jul 9, 2010At present I am using ajax:TabContainer for the tabs. As you know that does not do Lazy loading. Can sonone give me links to or some code examples to do Tabs with Lazy loading. I know that the Jquery tabs do lazy loading but there are no complete examples on the web which tells you on how to do lazy loading with JQuery tabs.
View 4 RepliesADO.NET :: Linq To SQL Lazy Loading, Immediate Execution, ToArray()?
Jul 28, 2010I am developing a website that has more and more LINQ queries. I have been keeping down the download size, optimizing the images, js, css and using HTTP Compression. I notice however, that now that I am using more LINQ queries and more complex queries, join and group joining queries, the 'waiting' time that the browser is doing is going up. The KB size of the page isn't any greater, but the page ultimately takes longer to load.
I have been reading up on LINQ and the behind the scenes of how it works. I have found that I need to use DataLoadOptions for the queries that join/group join to reduce the round trips to the database. I haven't had a chance to work on this yet, so if anyone has any great resources on this or tips, I'd appreciate it.
My main question about LINQ to SQL in this post is, if I have a bunch of queries throughout my site, in the masterpage, and the page itself, if I do not put .ToArray() at the end of the query, does that speed it up? If I leave ToArray() off of all the queries, do they then execute all at once when the page is loading instead of each time the page gets to that specific line to read and execute it?
I may be asking a dumb question, since I don't know a whole lot about the behind the scenes of LINQ yet, or the compiling of the page. I am using VWD 2010, so it does not have the SQL Profiler for me to test what I am asking.
DataSource Controls :: Lazy And Defer Loading Until GetObjectLink()
Mar 12, 2010need to sanity check what I think is correct. If I have some LINQ entity relationships that I create in code thus:-
[Code]....
these would lazy load, by default - correct? And if the first link was changed to
[Code]....
this would also lazy load and defer loading until GetObjectLink() was called, yes?
C# - Lazy Loading Part Of A Middle Layer Business Object?
Feb 14, 2011I want to build a business object such as an employee class, but I know that 80% of the properties will barely get used. So I wanted to know how I can create the object with the important properties in the constructor and lazy load the ones that are barley used when they are needed (if at all).
I am using asp.net with c#.
Exporting Entity Framework 4 Data Model To Entity Framework 3.5?
Oct 25, 2010Is there a way to export a EF 4.0 Data Model to EF 3.5?
I looked around and found that we are not able to access EF 4.0 from a ASP.Net 3.5 project here: [URL]
Our project is the 1st to go to .Net 4.0 using Entity Framework and we (the team) were wondering if there was a way for the other projects that "might" need to access our data that are still using the .Net 3.5 framework.
Lazy Loading - Umbraco Website Has (initially) Very High Server Response Time?
Jan 28, 2010I've got this problem.I launched an ASP.NET website with the Umbraco CMS on an ISP.(Its just a very basic informative site. nothing special.)When I go want to visit the website however, the first pageload takes a lot of time, sometimes even up to 20 seconds. Of course this is ridiculous. Afterwards, I am able to navigate the site relatively quick.. So every first pageload is slow, then everything is OK, more or less.Does anybody have any idea what the problem could be? Would it be IIS? ASP.NET?
View 5 RepliesData Controls :: GridView Lazy Loading - Records Should Display Whenever User Scroll Bar Down
Mar 10, 2012I have a requirement like need to display 5000+ records in gridview. So, I created scrollable div with gridview init and displaying 200 records per page. The website is running very slow because eveytime when user click on paging, it retrieving all the records from the database. I need to increase the website performance. I heard about a concept Girdview lazy loading but i don't know how to implement. I am looking for a solution like records should display in gridview when ever user scroll the bar down. How to do the gridview lazy loading.
View 1 RepliesADO.NET :: Entity Framework With Stored Procedure Versus Entity Framework Without Stored Procedures
Nov 2, 2010I am new to entity framework , it is really very good , but I want to know what is the difference between using entity framework with stored procedure or without stored procedure , which one the faster and what is the benefits for using stored procedures with entity framework.
View 1 RepliesEntity Framework -Update Entity When Another Entity Is Updated
Jun 30, 2010I have an EDM, it includes the entities extension and history. My goal is to use history to keep track of all the changes made to extension entity. For example, if extension with ID 223 has its property 'Name_Display' changed - I want the history entity to record this.
I'm using ASP.NET with VB.NET. Where in my code do I put the hook to say, "update the history entity" and what should that hook look like?
AJAX :: How To Lazy Loading Using Ajax Toolkit TabContainer Control
Jul 22, 2010At present we are using <ajax:TabContainer> to load tabs. I have 5 user controls inside <ajax:TabPanel>.
The problem is that all the data on these 5 pages gets loaded at once and increases the loading time as well as it is very hard to debug. Can we do lazy loading uisng TabContainer control? so that only the data of the current tab is loaded and when we click on the other tab then that's control data gets loaded.
AJAX :: Ajax Tab Control In Vs 2008 - Lazy Loading Of Data?
May 7, 2010I'm planning to fetch data to illustrate about the yearly sales achievement for last 3 years by showing seperately in grids in three different ajax tabs. i prefer to lazy loading of the data to the grid in each tab. is there a way to achieve this on the change event of the tabs.
View 1 RepliesCast Exception When Try To Insert Entity In Entity Framework (using Code-f)
Feb 9, 2011I get an cast exception when i am trying to insert an entity in Entity Framework (using code-first). From this code :
public virtual T Insert(T entity)
{
return Context.Set<T>().Add(entity);
}
The cast exception is like "impossible to cast ...Collection'1(Entity) to type (Entity)" I can't figure out why. I am pretty sure ive done everything right. Post entity
public class Post
{
public long PostId { get; private set; }
public DateTime date { get; set; }
[Required]
public string Subject { get; set; }
public User User { get; set; }
public Category Category { get; set; }
[Required]
public string Body { get; set; }
public virtual ICollection<Tag> Tags { get; private set; }
public Post()
{
Category = new Category();
if (Tags == null)
Tags = new Collection<Tag>();
}................................
ADO.NET :: Entity Framework - Entity Stored Procedure Mapping - Can't Update
Feb 10, 2011I am mapping a stored procedure to an entity by right clicking on the entity (in the .edmx) and selecting "Stored Procedure Mapping." This brings you to a Mapping Details - "Name of Entity" Window that allows you to select the insert, update, and delete stored procedures associated with the Entity. It also maps the stored procedure parameter to the Entity "Property" (Column).
I'm gettin an error "error 2042: Parameter Mapping specified is not valid." The cause of the error is fairly obvious, in the Insert stored procedure that has been selected, a 'CHAR' parameter is being mapped to an Int32 Entity Property. I altered the stored procedure parameter to match the entity, I deleted the stored procedure, readded, and reslected it as the Insert function. I also cleaned, validated, updated model from database. No matter what I do, the parameter list in the mapping details doesn't reflect the change to the stored procedure. It's stuck on a char --> int32 mapping, even though it has been changed, like it's buried deep in meta data some where.
ADO.NET :: Adding A New Entity In Entity Framework 3.5 With Related Data?
Aug 5, 2010I am trying to add a new entity and have to refernce associated data to add it. I cannot load the Referencetables. Giving "The EntityReference could not be loaded because it is not attached to an ObjectContext." How do i complete this task in Entity Framework 3.5
[Code]....
ADO.NET :: Entity Framework Copy Entity And Change PK And Save Old And New
Mar 31, 2011I have a stupid problem with the Entity Framework. I get the following Exception:
[Code]....
I have an entity with a 4 fields representing the primary key. I copy it via serialization (works fine). I set the old entity to not valid (Datefield set to a date in the past, this field is part of the PK) and set the copied entity to DateTime.Now.Date. When I call context.AddObject I get the Exception above. I tried copying the entity via reflection but the entity has 3-4 references. And when copied, I get another Exception before even Adding the entity to the context. I also tried setting newObj.EntityKey = null and reset all the fields neccessary for the PK. I just want a whole copy of an entity with a different primary key (and some other fields changed too) and Create it in the database.
How To Simply Update Entity In Entity Framework
Sep 21, 2010I'm writing a custom .NET MembershipProvider (not the built in one) and trying to update using Entity Framework. But of course i have no access to (Try)UpdateModel. How can i update it?
View 3 RepliesHow To Remove / Delete 0..1 Entity In Entity Framework 4
Jan 5, 2011I have an Events table and an InstallmentPlans table. The relationship is 0..1 : an Event can have 0 or 1 Installment plans. If I want to remove the existing InstallmentPlan for an event, how do I do this? Setting it to null doesn't seem to work:
_event.InstallmentPlan = null;
ADO.NET :: Entity Framework: Getting Key Of Newly Inserted Entity?
Feb 3, 2011Here's a simple code snippet where I create a new Entity object and call SaveChanges() to create a new record in the mapped database table.
[Code]....
What I'm trying to figure out is whether there is a way to derive this new key for my entity, e, from the ObjectContext, m? The reason for this is that the way my actual code is structured, my entity object is already out of scope at the point where I call the SaveChanges() method.
ADO.NET :: Order By An Include Entity In Entity Framework?
Sep 24, 2010I am trying to do something like this:
[Code]....
But ofcourse it is not working as I want to. The Ordering works on Question.Order, but I would also the
Questions.SubQuestions List to be ordered according to SubQuestions.Order
ADO.NET :: Use SP In The Entity Framework?
Feb 8, 2011I'm using VS 2008 with SP1. I want to use SP in the entity framework. The SP uses join of more than 1 table to return data. Most of the online examples I show, use the single table. How to return data of more than one tables?
View 4 RepliesADO.NET :: Need Help In ADO.Net Entity Framework 3.5
Nov 5, 2010solve this problemi create example using Northwind database so i create a new website and add new ADO.Net Entity Data Model (.edmx) called Northwind.edmx and i add Categories and Products table inside this (.edmx) fileand add new ADO.Net Data Servuce called "ADODataService" and add it as WebReferences called NorthwindServiceso i add new web page and drag DropdownList and Gridview as i want to bind Dropdownlist to all categories and when i select category from Dropdownlist bind Gridview to all Products related to this categoryso my code
[Code]....
and my code
[Code]....
so when i select category from Dropdownlist nothing happen :(also you will find commented code in method BindCategory whuch is not work also :(