LINQ to Entities does not recognize the method ElementAt(i);

c# linq entity-framework entity
Luca Romagnoli picture Luca Romagnoli · Feb 26, 2010 · Viewed 17.8k times · Source

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 recognize the method 'TimeEntModel.TDP_MissioniDestinazioni ElementAt[TDP_MissioniDestinazioni]
(System.Linq.IQueryable`1[TimeEntModel.TDP_MissioniDestinazioni], Int32)' method, and this method cannot be translated into a store expression.

Why am I getting this error and how can I fix it?

Answer

Jon Skeet picture Jon Skeet · Feb 26, 2010

Are you happy to fetch all the "earlier" results? If so, either call ToList() to cache them, or AsEnumerable() to fetch them on each call, with the AsEnumerable just being a way to force the compiler to call Enumerable.ElementAt instead of Queryable.ElementAt.

There may be a better way (e.g. using Take or Skip) though - could you give more information about the bigger picture?

Related questions

Entity Framework. Delete all rows in table

How I can quickly remove all rows in table using Entity Framework? I am currently using: var rows = from o in dataDb.Table select o; foreach (var row in rows) { dataDb.Table.Remove(row); } dataDb.SaveChanges(); However, it takes a …

Read More
Linq Syntax - Selecting multiple columns

This is my Linq Syntax which I am using to my entity model IQueryable<string> objEmployee = null; objEmployee = from res in _db.EMPLOYEEs where (res.EMAIL == givenInfo || res.USER_NAME == givenInfo) select res.EMAIL; How can I select …

Read More
Entity Framework select distinct name

How can I do this SQL query with Entity Framework? SELECT DISTINCT NAME FROM TestAddresses

Read More