How to add day to date in Linq to SQL

Question

I am writing this code. Here dt is input into the function, as well as someint. The column Exp is a T-SQL date column, which comes as a DateTime through Linq.

Answer 1

If you are using the Entity Framework, use the System.Data.Objects.EntityFunctions as below:

c.CMT_TS > System.Data.Objects.EntityFunctions.AddDays(e.Call.CALL_TS, 1)

Answer 2

May be good idea if you would first change your Sql query to Linq and process linq query instead.

Just add ToList() or limit record

return (from a in dataContext.TableOfA.ToList()
   where a.name == "Test" &&
   a.Exp.Value.AddDays(Convert.ToDouble(Someint)) >= new DateTimeOffset(dt)
   select a).First();

So once you have all your stuff in Linq then you can process more effectivly I think.

Cheers

Answer 3

You can also use SqlMethods.DateDiffDay method, if you're trying to compare two dates

Answer 4

I just changed the column back to a DateTime.

Answer 5

You can use: System.Data.Entity.DbFunctions.AddDays(YourDateTime, NumberOfDays) This function will be translated to valid SQL Query. Class System.Data.Entity.Core.Objects.EntityFunctions which also contains AddDays function is obsolete.

Answer 6

You can move the call to AddDays from the SQL part to the .NET part:

a.Exp.Value >= new DateTimeOffset(dt).AddDays(-Convert.ToDouble(Someint))