stackoverflow January 30, 2026 Rep: 31

How to avoid unnecessary evaluations in LINQ queries using OrderBy followed by multiple ThenBy clauses

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January 30, 2026 Score: 0 Rep: 187,576 Quality: Low Completeness: 40%

If second criterium is very expensive, we can use GroupBy to avoid unwanted inner reading:


var sorted =
  .GroupBy(item => item.Age)
  .OrderBy(group => group.Key)
  .SelectMany(group => group.Count()

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