用linq命令对父子进行排序

Question

Input:

I want to develop linq query order by job name(parents) and sequence of child with in list of object

i tried below query (not working)

qry = qry.OrderBy(j => j.Id).ThenBy(j => j.jobName).ThenBy(j => j.documentGroupId);

Expected Output:

Any one help!!!

Answer 1

As far as I can see, the expected result is ordering by ID column first, but from 1004 to 1001 which means you need to order it by descending. Use Enumerbale.OrderByDescending and Enumerable.ThenByDescending instead.

You should try that:

var result = qry.OrderByDescending(j => j.Id).
          ThenBy(j => j.SubId).
          ThenBy(j => j.JobName).
          ThenByDescending(j => j.DocumentGroupId).ToList();

Also, it would be great to have more details on how things should be sorted. Not just expected result screen.

Answer 2

Like this?

qry =
  qry
    .GroupBy(j => j.Id)
    .OrderBy(group => group
      .Single(j => j.SubId == 0)
      .Name)
    .SelectMany(group => group
      .OrderBy(j => j.SubId))
    .ToList();