How to use Entity Framework with Stored procedures and POCOs

Question

I am trying here to use Entity Framework with Stored procedures and POCOS and 2 different projects.

I have one project DataAccess (for my edmx and DataContexts) and one project BusinessEntities (for my POCOs).
DataAccess have a reference of BusinessEntities.

In my DB I have a pretty standard SP :

CREATE STORED PROCEDURE GetHeader
    @id CHAR(35)
AS
BEGIN
    SELECT ID, Name FROM mytable WHERE ID = @id
END

The datacontext is :

public class DbContext : ObjectContext
{
public ObjectResult<BusinessEntities.GetHeaderResult> GetHeader(string id)
{
return base.ExecuteFunction<BusinessEntities.GetHeaderResult>("GetHeader", new ObjectParameter("id", id));
}
}

If I only go like this (the EDMX has been updated with the SP but the function has not been imported) I have this error :

System.InvalidOperationException: The FunctionImport 'GetHeader' could not be found in the container 'DbEntities'.

If I import the function correctly I have this error :

System.InvalidOperationException: The type parameter 'BusinessEntites.GetHeaderResult' in ExecuteFunction is incompatible with the type 'DbModel.GetHeaderResult' returned by the function.

I guess that it is only just a simple setting that is missing here but I can't seem to grab it.

Please not that the EDMX file has the correct setting (CodeGenerationStrategy set to none, CustomTool is empty)

Answer 1

In the first case you are calling wrong method on the context. ExecuteFunction is only for function imports. Use ExecuteStoreQuery and SqlParameter instead. In the second case function import also creates a complex type in your EDMX and EF expects you will use that complex type as a result of function import call.