Simple IEnumerable functions to find continuous sections

IEnumerableContinuous.cs

/// <summary>
/// Finds sections of the given IEnumerable<bool> that are continuously true
/// </summary>
/// <param name="src">Any IEnumerable<bool></param>
/// <returns>An IEnumerable<Tuple<int, int> where each pair represents the start and end index that is continuously true</returns>
private IEnumerable<Tuple<int, int>> FindContinuousTrue(IEnumerable<bool> src)
{
   var res = new Collection<Tuple<int, int>>();
   var srclist = src.ToList();

   // Bool edge detection algorithm
   bool pairclosed = true;
   int risingedgeidx = 0;
   for (int i = 1; i < srclist.Count; i++)
   {
      if (!srclist[i - 1] && srclist[i]) // rising edge False -> True
      {
         risingedgeidx = i;
         pairclosed = false;
      }
      else if (srclist[i - 1] && !srclist[i]) // falling edge True -> False
      {
         res.Add(new Tuple<int, int>(risingedgeidx, i - 1));
         pairclosed = true;
      }
   }
   if (!pairclosed)
   {
      res.Add(new Tuple<int, int>(risingedgeidx, srclist.Count - 1));
   }

   // Special case: If no edges can be found and the first element is true, all elements must be true
   if (res.Count() == 0 && srclist[0] == true)
   {
      res.Add(new Tuple<int, int>(0, srclist.Count - 1));
   }

   return res;
}

/// <summary>
/// Finds sections of the given IEnumerable<int> that are continuous in value
/// </summary>
/// <param name="src">Any IEnumerable<int></param>
/// <returns>An IEnumerable<Tuple<int, int> where each pair represents the start and end index that is continuous</returns>
private IEnumerable<Tuple<int, int>> FindContinuous(IEnumerable<int> src)
{
   var res = new Collection<Tuple<int, int>>();
   var srclist = src.ToList();

   // edge detection algorithm
   int lastedgeidx = 0;
   for (int i = 1; i < srclist.Count; i++)
   {
      if (srclist[i - 1] != srclist[i]) // edge
      {
         res.Add(new Tuple<int, int>(lastedgeidx, i - 1));
         lastedgeidx = i;
      }
   }
   res.Add(new Tuple<int, int>(lastedgeidx, srclist.Count - 1));

   return res;
}