Entity Framework 6 - Knowledge Base (KB)
30 results in tag: iqueryable
How does Linq To Entities handle paging IQueryable? (an issue with OrderBy)
I am currently building a simple ASP.NET MVC site using Linq to Entities. My first foray into this world was nerd dinner, which is where I found the paginated list code that I am attempting to use. The code looks as follows:...public class PaginatedList<T...
asked by Sergio
From a stored procedure, IQueryable> (entity framework)
I want to get ...IQueryable<>... result when executing stored procedure. ...Here is piece of code that works fine: ...IQueryable<SomeEntitiy> someEntities; var globbalyFilteredSomeEntities = from se in m_Entities.SomeEntitiy where se.Glob...
asked by arena-ru
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
Differences between IEnumerable and IQueryable as ObjectSet types
As I understand it when I use LINQ extension methods (with lambda expression syntax) on ...IQueryable... that is in the fact instance of ...ObjectSet... they are translated into LINQ to SQL queries. What I mean is that command...IQueryable<User> users = d...
asked by Rasto
Entityframework includes child objects
I want to include child objects on an IQueryable list.....I want to include a child object on selected columns of some table type IQueryable list.....I tried like this:...IQueryable<Persons> persons = Context.Persons.Select(x=> new persons{Pkid=x.pkid, Fi...
asked by Sunny43
How do you set the value of an IQueryableTproperty? >'s
I'm using Entity Framework 4.1 Code First. In my entity, I have three date/time properties:...public class MyEntity { [Key] public Id { get; set; } public DateTime FromDate { get; set; } public DateTime ToDate { get; set; } [NotMap...
asked by Matt Johnson-Pint
IQueryable vs. IEnumerable in the.NET Entity Framework
Please see this line of code. This is an invocation of a stored procedure, which returns an ...ObjectResult<long?>.... In order to extract the long values I added the Select:...dbContext.FindCoursesWithKeywords(keywords).Select(l => l.Value); ...Based on ...
asked by justabuzz
Only is supported by a Contains query in Linq. The variable IQueryable is an external variable.
I am using Entity Framework with Linq to Entities, trying to select some data from my database. When I create a Linq query that uses the method ...IQueryable<int>.Contains..., it can only filter the data if I use an external variable! Let me show some exa...
asked by tyron
IQueryableEntityObject> is converted to IQueryableSpecific>.
We are trying to cast an instance of ...IQueryable<EntityObject>... to an ...IQueryable<SpecificEntityObject>..., the ...SpecificEntityObject... type is only known at runtime....We have tried using the code below, which does not compile because The type o...
asked by Stuart.Sklinar
Order LINQ Why are you not ordering... altering nothing...?
Any idea why the LINQ OrderBy is not working in following code, (have no errors but method does not sort ...)...First my own type...public class IQLinksView { public int id { get; set; } public int catid { get; set; } public in...
asked by user1415838
Using EF and WebAPI, how can I return a ViewModel AND support IQueryable/OData?
I've got an ASP.NET WebAPI project. I've recently created EntityFramework entities for all my data tables. But I don't want to expose my data layer & schema to my users. How can I map my entities to a ViewModel (automapper?) ...and... provide IQueryable r...
asked by Eric Falsken
Composing Expression<Func<T, bool>> predicates
I have a method that returns an...Expression<Func<T, bool>> ...When I use this as a predicate in a where clause in EF this works fine, until I try to add more items to the predicate with Expression.Or() I run into the following exception:...The parameter...
asked by Oxymoron
Using IQueryable select to filter columns
I've been exploring WEB API based on the guide at www.asp.net, and I've run into a problem when trying to filter columns from a table....My code is simply this:... // GET api/Admin public IEnumerable<Product> GetProducts(testvar = "") { ...
asked by ASouthorn
Implement IQueryable wrapper to translate result objects
Update 2013-08-22:...After having a look at the 'Building an IQueryable provider series' (thanks for the link!) I got a bit further. I updated the code accordingly. It is still not fully working though. If I understand the tutorial correctly, the ...GetEn...
asked by cyan902
Cannot implicitly convert type System.Linq.IQueryable<string> to string
I have two tables named Rank and CrewMembers.I want to fetch the name of rank which is present in Rank table on the basis of id of CrewMember.I have passed the crewId as a parameter and on the basis of that the method would return the Rank of that specifi...
asked by prers
Merging two iqueryables that are projected to one entity from different tables
I have tried ...This answer..., ...This one... and ...this one... to merge two iqueryables. But I always receive the following error:...The type 'Estudio' appears in two structurally incompatible initializations within a single LINQ to Entities query. A t...
asked by amalbala
DateTime or int to string inside IQueryable?
How do I convert DateTime or int to string inside IQueryable? I need to do something like this, but without ...ToString()..., which throws ...System.NotSupportedException... exception:...IQueryable filteredEntities = myIQueryableCollection .Where(o =>...
asked by SoftwareFactor
How to apply an expression tree for IQueryable?
Is there any way to apply a manually created expression tree from one IQueryable to another? For example:...IQueryable<string> p = Enumerable.Empty<string>().AsQueryable(); p = p.Where(pp => pp[0] == 'A'); p = p.Skip(2).Take(4); p = p.OrderBy(pp => pp.Len...
asked by dyatchenko
EF6: Use reference/lookup data with IQueryable
I want to use a pre-loaded lookup data from a list within a query. I need the query to return as IQueryable because it is used in a grid & being paged (not included here). I need the Labels to load from the lookup to avoid joins (more are in the actual c...
asked by Steve Kinyon
How to map an int to its enum description using AutoMapper during a queryable projection?
Here is the enum extension method to get its description attribute....public static string GetDescription(this Enum enumeration) { if (enumeration == null) throw new ArgumentNullException(); var value = enumeration.ToString(); var typ...
asked by BBauer42
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