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  1. using System;
  2. using System.Globalization;
  3. using System.Linq;
  4. using System.Collections.Generic;
  5.  
  6. public class Test
  7. {
  8. 	public static void Main()
  9. 	{
  10.         List<string> listA = new List<string> { "A", "A", "B", "C", "D", "E" };
  11.         List<string> listRef = new List<string> { "B", "D" };
  12.  
  13.         var refSet = new HashSet<string>(listRef);
  14.         refSet.IntersectWith(listA);
  15.         bool anyMoreThanOne = refSet.Any(rs => listA.ContainsMoreThanOnce(rs, StringComparison.OrdinalIgnoreCase));
  16.         Console.Write(anyMoreThanOne);
  17. 	}  
  18. }
  19.  
  20. public static class StringExtensions
  21. {
  22.      public static bool ContainsMoreThanOnce(this IEnumerable<string> coll, String value, StringComparison comparer)
  23.     {
  24.         if (coll == null) throw new ArgumentNullException("col");
  25.         bool contains = false;
  26.         foreach (string str in coll)
  27.         {
  28.             if (String.Compare(value, str, comparer) == 0)
  29.             {
  30.                 if (contains)
  31.                     return true;
  32.                 else
  33.                     contains = true;
  34.             }
  35.         }
  36.         return false;
  37.     }
  38. }
Success #stdin #stdout 0.03s 34008KB
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stdin
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Standard input is empty
stdout
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False
https://ideone.com/WRheCF
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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