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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4. using System.Diagnostics;
  5.  
  6. public class Test
  7. {
  8. 	public static void Main()
  9. 	{
  10. 		var sw = new Stopwatch();
  11.                 int many = 10000000;
  12.                 var manyDoubles = new List<double>(many);
  13.                 var range = Enumerable.Range(1, many).Select(i => (double)i);
  14.  
  15. 		var orderFirst = manyDoubles.OrderBy(d => d).Distinct();
  16.                 sw.Start();
  17.                 manyDoubles.AddRange(orderFirst);
  18.                 sw.Stop();
  19.                 Console.WriteLine("Time for first orderby then distinct: {0}", sw.Elapsed.ToString());
  20. 		manyDoubles = new List<double>(many);
  21.  
  22. 		var distinctFirst = manyDoubles.Distinct().OrderBy(d => d);
  23.                 sw.Reset();
  24.                	sw.Start();
  25.                 manyDoubles.AddRange(distinctFirst);
  26.                 sw.Stop();
  27.                 Console.WriteLine("Time for first distinct then orderby: {0}", sw.Elapsed.ToString());
  28. 	}
  29. }
Success #stdin #stdout 0.17s 209984KB
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stdin
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Standard input is empty
stdout
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Time for first orderby then distinct: 00:00:00.0045379
Time for first distinct then orderby: 00:00:00.0013316
https://ideone.com/IH2AH
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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