Question

I am trying to sort data which is from Generic List object.
By using below code, I can sort my data according to Title column.
But what I would like to do is I would like to sort data according to parameter value called sidx.

public ActionResult ListingGridData(string sidx, string sord, int page, int rows)
    {
        int currentPage = Convert.ToInt32(page) - 1;
        int totalRecords = 0;
        var SeminarList = (List<Seminar>)null;

        if(sord.Equals("asc"))
            SeminarList = seminarRepository.AllSeminarList().Seminar_Masters
                  .OrderBy(x => x.Title )
                  .Skip(currentPage * rows)
                  .Take(rows)
                  .ToList();
        else
            SeminarList = seminarRepository.AllSeminarList().Seminar_Masters
                  .OrderByDescending(x => x.Title)
                  .Skip(currentPage * rows)
                  .Take(rows)
                  .ToList();

        totalRecords = seminarRepository.AllSeminarList().Seminar_Masters.Count;

        var totalPages = (int)Math.Ceiling((float)totalRecords / (float)rows);

        ....
    }

So I have modified my code like that, but it does not work.
It does not sort as I have expected.

SeminarList = seminarRepository.AllSeminarList().Seminar_Masters
                  .OrderBy(x => sidx)
                  .Skip(currentPage * rows)
                  .Take(rows)
                  .ToList();

The object which I now use is pure List object, not IQueryable object.

As for sorting purpose, I don’t want to go back to SQL select statement, I would like to sort data at Controller layer.

Please let me get any suggestions.

Answer 1

See answer for dynamic where and orderby using some helper
methods here
where can I find a good example of using linq & lambda expressions to generate dynamic where and orderby sql?