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Sometimes a LINQ query or other method returns a nested collection but you just want one big collection instead. SelectMany is the answer, see the code below. It can off course also be combined with OrderBy or Distinct if you prefer.

List<List<double>> nestedList = new List<List<double>>
                                      new List<double> { 1.2, 2.4 },
                                      new List<double> { 3.6, 4.8 }

List<double> flatList = nestedList.SelectMany(doubleList => doubleList).ToList();
foreach (double item in flatList)
Posted on Friday, October 30, 2009 3:14 PM LINQ , C# | Back to top

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