LINQ to Entities StringConvert(double)' cannot be translated to convert int to string

Question

Problem

Need to convert int to string using EF4 + SQL CE4. The recommended option of using SqlFunctions.StringConvert(double) still gives me errors.

Answer 1

EF is database independent at upper layers but the part dealing with conversion of linq query to SQL is always database dependent and SqlFunctions are dependent on SQL Server Provider but you are using SQL Server CE provider which is not able to translate functions from SqlFunctions class.

Btw. third option is also not a solution because it will select whole customer table to memory and use linq-to-objects after that. You should use this:

public static IEnumerable xxGetCustomerList()
{
    using (DatabaseEntities db = new DatabaseEntities())
    {
        // Linq to entities query
        var query = from l in db.Customers
                    orderby l.CompanyName
                    select new { l.CustomerID, l.CompanyName };

        // Result of linq to entities transformed by linq to objects
        return query.AsEnumerable()
                    .Select(x => new SelectListItem
                        {
                           Value = x.CustomerID.ToString(),
                           Test = x.CompanyName  
                        }).ToList();
    }
}