Difference Of Dates in Linq To Entities

Posted by Sharpcnet under LINQ on 12/5/2013 | Points: 10 | Views : 14834 | Status : [Member] | Replies : 7

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I am trying to get the no. of days by subtracting 2 dates, but both these trials say - 'DataSet does not support system.Nullable<> - Using C#, Linq To Entities


public DataTable GetData()
{
    var qry = from a in MyDB.tblBranch.Where(a=>a.branchid==1)
              join e in MyDB.tblEmp on a.Eid equals e.Eid
              select new
              {
                 days = System.Data.Objects
                        .EntityFunctions.DiffDays(a.ExitDate,a.EnterDate)
                //days = System.Data.Objects.SqlClient.SqlFunctions.
                //DateDiff("dd",a.ExitDate,a.EnterDate)
              };
     DataTable dt = qry.ToDataTable();
     return dt;
}

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Posted by: Bandi on: 12/5/2013 [Member] [MVP] Platinum | Points: 25

0	http://stackoverflow.com/questions/570858/linq-to-entities-for-subtracting-2-dates Mark This Response as Answer -- Chandu http://www.dotnetfunda.com/images/dnfmvp.gif Sharpcnet, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Sharpcnet on: 12/5/2013 [Member] Starter | Points: 25

0	Thank you but none of them helped. Could you suggest the code that could go with my case. I am unable to figure it out in anyways Sharpcnet, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: vishalneeraj-24503 on: 12/5/2013 [Member] [MVP] Platinum | Points: 25

0	Refer:- http://stackoverflow.com/questions/570858/linq-to-entities-for-subtracting-2-dates http://stackoverflow.com/questions/12247727/subtract-two-dates-in-linq-to-entities-which-returns-a-timespan http://itsmebhavin.wordpress.com/2011/03/03/linq-to-entities-for-subtracting-2-dates/ Sharpcnet, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: vishalneeraj-24503 on: 12/5/2013 [Member] [MVP] Platinum | Points: 25

0	http://www.questionhub.com/StackOverflow/570858 http://www.pressinganswer.com/1090726/linq-to-entities-for-subtracting-2-dates http://www.plaintxt.org/linq_to_entities_for_subtracting_dates_21377296.html Sharpcnet, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Bandi on: 12/5/2013 [Member] [MVP] Platinum | Points: 25

0	Sample code to get number of days between two dates and checking for NULL values int totalDays = (from d in db.RentalDvds.Where(d=>d.ReturnDate.HasValue && d.RentedDate.HasValue) select (d.ReturnedDate - d.RentedDate).Days).FirstOrDefault(); Mark This Response as Answer -- Chandu http://www.dotnetfunda.com/images/dnfmvp.gif Sharpcnet, if this helps please login to Mark As Answer. \| Alert Moderator

Sample code to get number of days between two dates and checking for NULL values

int totalDays = 
  (from d in db.RentalDvds.Where(d=>d.ReturnDate.HasValue && d.RentedDate.HasValue)
     select (d.ReturnedDate - d.RentedDate).Days).FirstOrDefault();

Mark This Response as Answer
--
Chandu
http://www.dotnetfunda.com/images/dnfmvp.gif

Sharpcnet, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: vishalneeraj-24503 on: 12/6/2013 [Member] [MVP] Platinum | Points: 25

0	DateTime oldestDate = DateTime.Now.Subtract(new TimeSpan(maxAgeInDays, 0, 0, 0, 0)); Or where (vid.CreatedDate >= EntityFunctions.AddDays(DateTime.Now, -maxAgeInDay)) Sharpcnet, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Sharpcnet on: 12/6/2013 [Member] Starter | Points: 25

0	@Bandi.. Hi. It might work if it was the only column, but I have multiple columns to retrieve in the datatable and the days would be one of them. What should I write in that case: select new { days = System.Data.Objects.EntityFunctions.DiffDays(a.ExitDate,a.EnterDate) branchid = a.branchid, entrydate = a.entrydate ?? datetime.minvalue, exitdate = a.exitdate ?? datetime.minvalue, }; Sharpcnet, if this helps please login to Mark As Answer. \| Alert Moderator

@Bandi.. Hi. It might work if it was the only column, but I have multiple columns to retrieve in the datatable and the days would be one of them. What should I write in that case:

select new
 {
    days = System.Data.Objects.EntityFunctions.DiffDays(a.ExitDate,a.EnterDate)
    branchid = a.branchid,
    entrydate = a.entrydate ?? datetime.minvalue,
    exitdate = a.exitdate ?? datetime.minvalue,
  };

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