The result of a query cannot be enumerated more than once

Question

I am using the entity framework  ef  and am getting the following error        The result of a query cannot be enumerated more than once      I have a repository class which contains the ef data context  I then have a controller class  not to be confused with MVC controllers  which contains an instance of the repository  So far so good    I have a search method on the controller which is supposed to return an array of RadComboBoxItemData  which is used to populate a Telerik RadComboBox control   public RadComboBoxItemData   Search int id  string searchText        var query   context Search id  searchText       List lt RadComboBoxItemData gt  result   new List lt RadComboBoxItemData gt         foreach  var item in query                RadComboBoxItemData itemData   new RadComboBoxItemData            itemData Text          assign some text here            itemData Value         assign some value here             result Add itemData              return result ToArray        When I debug my code  I can get into the foreach loop  but then I get an error saying      An exception of type    System InvalidOperationException    occurred in System Data Entity dll but   was not handled in user code      Additional information  The result of   a query cannot be enumerated more than   once    My entity uses a function import of an existing stored proc      EF repository method calling the function imported method on the data context  public IEnumerable lt SearchItem gt  Search int id  string searchText        return this entityContext Search id  searchText       The function import Search calls a stored precedure to return a collection of SearchItem   I have a feeling that the foreach loop can t iterate because of something with the ef

User · Accepted Answer

Try explicitly enumerating the results by calling ToList     Change  foreach  var item in query    to  foreach  var item in query ToList

User · Answer

if you getting this type of error so I suggest you used to stored proc data as usual list then binding the other controls because I also get this error so I solved it like this ex -  repeater DataSource   data SPBinsReport   Tolist    repeater DataBind      try like this

User · Answer

Try replacing this  var query   context Search id  searchText     with   var query   context Search id  searchText  tolist      and everything will work well

[c#] The result of a query cannot be enumerated more than once

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