如果修改日期大于或现在使用linq，则从数据库中选择所有记录

Question

I am having an issue, that I am wondering can anyone help me with. I am creating a list from a Database using Linq, I want to return all the records in a list that have been Modified on the current day.

The date was intaily set by:

  contact.CreatedDate = System.DateTime.Now; ctx.Contacts.Add(contact);' 

When the record is updated the ModifiedDate is given a value.

  contact.ModifiedDate = System.DateTime.Now;
  ctx.Entry(contact).State = EntityState.Modified;

Which is all fine the issue is below:

var Contactlist = ctx.Contacts.Where(x => x.ModifiedDate = System.DateTime.Now ).ToList();

Answer 1

For Entity framework EntityFunctions.TruncateTime

var Contactlist = ctx.Contacts.Where(x => 
                       EntityFunctions.TruncateTime(x.ModifiedDate) == EntityFunctions.TruncateTime(System.DateTime.Today))
                       .ToList();

For LINQ to objects you could have compare the Date part only like:

var Contactlist = ctx.Contacts.Where(x => x.ModifiedDate.Date == System.DateTime.Today)
                              .ToList();

DateTime type object in .Net framework has Date as well as Time part, your current check would compare both date and time. (Also you need == instead of = )

DateTime.Now would return current date with current time, DateTime.Today will return your current date with time set to 00:00:00 . Similarly DateTime.Date would return the date part with time set to 00:00:00 , so you can use that for comparing date part only.