Question

I already have a variable containing some groups. I generated that using the following LINQ query:

var historyGroups = from payee in list
                                group payee by payee.Payee.Name into groups
                                orderby groups.Key                                
                                select new {PayeeName = groups.Key, List = groups };

Now my historyGroups variable can contain many groups. Each of those groups has a key which is a string and Results View is sorted according to that. Now inside each of those groups there is a List corresponding to the key. Inside that List there are elements and each one those element is an object of a particular type. One of it’s fields is of type System.DateTime. I want to sort this internal List by date.

Can anyone help with this? May be modify the above query or a new query on variable historyGroups.

Thanks

Answer 1

It is not clear to me what you want to sort on (the payee type definition is missing as well)

var historyGroups = from payee in list
    group payee by payee.Payee.Name into groups
    orderby groups.Key                                
    select new {
         PayeeName = groups.Key, 
         List = groups.OrderBy(payee2 => payee2.SomeDateTimeField)
    };

Is most straightforward.

If you really want to sort only by date (and not time), use SomeDateTimeField.Date.

Inside that List there are elements and each one those element is an object of a particular type. One of it’s fields is of type System.DateTime

This leads me to maybe(?) suspect

List = groups.OrderBy(payee2 => payee2.ParticularTypedElement.DateTimeField)

Or perhaps even

List = groups.OrderBy(payee2 => payee2.ObjectsOfParticularType
      .OfType<DateTime>()
      .FirstOrDefault()
)

I hope next time you can clarfy the question a bit better, so we don’t have to guess that much (and come up with a confusing answer)