LINQ query on Datatable Help

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I have a DataTable

id	StartTime EndTime  duration  ratio
1	   7	    11	    4	      1.99
2	  11	    15	    4	      1.99
3	  15	    19	    4	      1.99
4	  19	    23	    4	      1.99

Need output as below

StartTime EndTime  duration  ratio
   7	    15       8	      3.98
  15	    23	     8	      3.98

What I have tried is

C#

(from p in DataTable.AsEnumerable()
 join o in DataTable.AsEnumerable() 

                   on p["EndTime"].ToString() equals o["StartTime"].ToString()

 orderby (DateTime.ParseExact(p["StartTime"].ToString(), "HHmm", provider)).Hour

 where (int.Parse(p["Duration"].ToString()) + int.Parse(o["Duration"].ToString())) == 8

 select new
    {
       ID = p["ID"].ToString(),

       StartTime = Math.Min(DateTime.ParseExact(p["StartTime"].ToString(), "HHmm", provider).Hour, DateTime.ParseExact(o["StartTime"].ToString(), "HHmm", provider).Hour),

       EndTime =   Math.Max(DateTime.ParseExact(o["EndTime"].ToString(), "HHmm", provider).Hour, DateTime.ParseExact(p["EndTime"].ToString(), "HHmm", provider).Hour),

       Ratio =Math.Round(decimal.Parse(p["HPPS"].ToString()) + decimal.Parse(o["HPPS"].ToString()), 2)

    }).OrderBy(x => x.StartTime).Distinct().ToList();

Output I am Getting is

StartTime EndTime  duration  ratio
   7	    15       8	      3.98
  11        19       8        3.98
  15	    23	     8	      3.98

Posted 17-Sep-14 4:17am

member33

Updated 17-Sep-14 4:19am

v2

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Maciej Los · Answer 1 · 2015-01-14T12:03:00

Try this:

C#

var qry = from a in dt.AsEnumerable()
        join b in dt.AsEnumerable() on a.Field<int>("EndTime") equals b.Field<int>("StartTime")
        select new {
            StartTime = a.Field<int>("StartTime"),
            EndTime = b.Field<int>("EndTime"),
            Duration = a.Field<int>("Duration") + b.Field<int>("Duration"),
            Ratio = a.Field<double>("Ratio") + b.Field<double>("Ratio")
            };

Returns:

StartTime EndTime Duration Ratio
7         15      8        3.98 
11        19      8        3.98 
15        23      8        3.98