c# - Overlapping Ranges Check for Overlapping -

i have list of ranges , find out if overlap.

i have following code. not seem working. there easier way or way works :)

thanks in advance advice.

   public partial class form1 : form {     public form1()     {         initializecomponent();     }      private ilist<range> rangelist;      private void form1_load(object sender, eventargs e)     {         rangelist.add(new range{fromnumber = 0, tonumber = 100});         rangelist.add(new range { fromnumber = 101, tonumber = 200 });          // range should on lap , throw exception          rangelist.add(new range { fromnumber = 199, tonumber = 300 });      }      private bool rangesoverlap()     {         var biglist = new list<list<int>>();          foreach (var range in this.rangelist)         {             biglist.add(new list<int> { range.fromnumber , range.tonumber });         }          ienumerable<ienumerable<int>> lists = biglist;          return lists          .where(c => c != null && c.any())          .aggregate(enumerable.intersect)          .tolist().count > 0;     } }   public class range {     public int fromnumber { get; set; }     public int tonumber { get; set; } } 

first merge numbers , check generated list in sorted order:

rangelist .orderby(p => p.fromnumber) .select(p => new[] { p.fromnumber, p.tonumber }) .selectmany(p => p) .aggregate((p, q) => q >= p ? q : int.maxvalue) == int.maxvalue