LINQ query — Data aggregation (Group Adjacent)

Question

Let\'s take a class called Cls:

public class Cls
{
    public int SequenceNumber { get; set; }
    public int Value { get; set; }
}

Answer 1

You can use this linq query

Demo

var values = (new[] { 9, 9, 15, 15, 15, 30, 9 }).Select((x, i) => new { x, i });

var query = from v in values
            let firstNonValue = values.Where(v2 => v2.i >= v.i && v2.x != v.x).FirstOrDefault()
            let grouping = firstNonValue == null ? int.MaxValue : firstNonValue.i
            group v by grouping into v
            select new
            {
              From = v.Min(y => y.i) + 1,
              To = v.Max(y => y.i) + 1,
              Value = v.Min(y => y.x)
            };