c# multiple sorting

Question

I have 3 levels for a PlanSolution 1,2,3 and i need to sort by .levelId initially, and then alphabetically sort the solutions belonging to that level by .name

PlanSolution[] planSolutions = wsAccess.GetPlanSolutionsForPlanRisk(planRisk.Id);
                    List<PlanRisk> planSolutionsList = new List<PlanRisk>(planSolutions);


                    planSolutionsList.Sort(delegate(PlanSolution x, PlanSolution y)
                    {
                        //HELP lol
                    });

You don't need to create a List<T> just to do sorting. Just use the Array.Sort() method as well as one of the delegates provided in the many solutions. Linq may be overkill if your array is large, as it may require you to make a copy of it if you want to keep it as an array or list (via ToList() or ToArray()). — Steve Guidi
– Steve Guidi, Commented Aug 20, 2009 at 16:53

Jimmy · Accepted Answer · 2009-08-20 16:39:04Z

6

LINQ to the rescue!

planSolutionsList = planSolutions
    .OrderBy(x => x.id)
    .ThenBy(x => x.Name)
    .ToList(); // is this necessary?

For the original format -- you just want your comparer to prioritize ID over name

planSolutionsList.Sort( (x, y) => 
{
   //HELP lol
   if (x.id != y.id) return x.id - y.id;
   else return x.Name.CompareTo(y.Name);
});

edited Aug 20, 2009 at 16:39

answered Aug 20, 2009 at 16:32

Jimmy

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Comments

Gavin H · Accepted Answer · 2009-08-20 16:33:18Z

1

you could use Linq

planSolutionsList.OrderBy(x => x.Level).ThenBy(x => x.Name).ToList();

answered Aug 20, 2009 at 16:33

Gavin H

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Comments

user124493 · Accepted Answer · 2009-08-20 16:32:58Z

0

For a language-acnostic approach: Do each one in order.

1) Sort on the level. 2) Remember the starting locations of each level after sorting 3) repeat for next sorting crieteria, only sorting the sub-sections.

answered Aug 20, 2009 at 16:32

user124493

Comments

João Silva · Accepted Answer · 2009-08-20 16:42:34Z

0

  planSolutionsList.Sort(delegate(PlanSolution x, PlanSolution y) {
    if (x.Level == x.Level) {            // same level, compare by name
      return x.Name.CompareTo(y.Name);
    } else {                             // different level, compare by level
      return x.Level.CompareTo(y.Level);
    }
  });

answered Aug 20, 2009 at 16:42

João Silva

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