'TimeOfDay' is not supported in LINQ to Entities - Find total seconds in Linq 2 SQL

Question

When I do the following :

[EdmFunction(\"Edm\", \"TruncateTime\")]
public static DateTime? TruncateDateTime(DateTime? inputDate)
{
    return inputDate.HasV         


        

Answer 1

Try using SqlFunctions.DatePart.

e.g. instead of

var employeeSelection = (from c in MyContext.Employees
          .Where(c => c.From.HasValue && GetTotalSeconds(c.To) != 0)

try something like

var employeeSelection = (from c in MyContext.Employees
          .Where(c => c.From.HasValue && SqlFunctions.DatePart("second", c.To) != 0)

For NetMage

var employeeSelection = (from c in MyContext.Employees
          .Where(c => c.From.HasValue && (SqlFunctions.DatePart("second", c.To) + (60 * SqlFunctions.DatePart("minute", c.To)) + (3600 * SqlFunctions.DatePart("hour", c.To))) != 0)

Where

TotalSeconds = (SqlFunctions.DatePart("second", c.To) + (60 * SqlFunctions.DatePart("minute", c.To)) + (3600 * SqlFunctions.DatePart("hour", c.To)))

Answer 2

If you have a Linq-To-Entities Query you can only perform operations which can be executed by your used database management system.

You will need to get your desired information from your DB and create a list from that query, than that will be called Linq-To-Objects and you will be able to perform you desired operation.

Answer 3

Have a look at Date and Time Canonical Functions for LINQ-to-Entities and if you are unsure on how to call them, have a look at How to: Call Canonical Functions

The methods that are available should be able to solve the problem your currently having where the operations your currently using are not supported by the database.