c# , Entity Framework Stored Procedure

Question

I am using Entity Framework. I have the following:

var db = new LikEntities();

GetParamAlerts_Result paramRslt = db.GetParamAlerts();

GetParamAlerts is a stored procedure and it is of type

System.Data.Objects.ObjectResult<GetParamAlerts_Result>

Note the GetParamAlerts returns multiple rows.

When I run the code above I the following error message :

Cannot implicitly convert type:

'System.Data.Objects.ObjectResult' to 'PVT_Alert_Notification.GetParamAlerts_Result'

Not sure how to resolve this.

Answer 1

This is because Entity Framework cannot guarantee that your stored procedure will always return a single row, so it's put into a ObjectResult which is just an enumerable collection . If you're always expecting a single result, you can use db.GetParamAlerts().Single() to get the result as GetParamAlerts_Result , or use any of the standard enumerable methods like First() , FirstOrDefault() , SingleOrDefault() , etc.

Answer 2

it looks like you should either be using

PVT_Alert_Notification.GetParamAlerts_Result paramRslt = db.GetParamAlerts();

or the method is returning the wrong type? Can you pot the code for the method? or you are getting a collection ?

If you have a collection, you could use:

var result = db.GetParamAlerts();
return result.FirstOrDefault();

You will see a similar post here

Answer 3

try incorporating first or default at the end

 GetParamAlerts_Result paramRslt = db.GetParamAlerts().FirstOrDefault();

try using cast

  GetParamAlerts_Result paramRslt = db.GetParamAlerts().Cast<GetParamAlerts_Result>().ToList();