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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4.  
  5. public static class ListExtensions
  6. {
  7.     /// <summary>
  8.     /// Finds the indices of all objects matching the given predicate.
  9.     /// </summary>
  10.     /// <typeparam name="T">The type of objects in the list.</typeparam>
  11.     /// <param name="list">The list.</param>
  12.     /// <param name="predicate">The predicate.</param>
  13.     /// <returns>Indices of all objects matching the given predicate.</returns>
  14.     public static IEnumerable<int> FindIndices<T>(this IList<T> list, Func<T, bool> predicate)
  15.     {
  16.         return list.Where(predicate).Select(list.IndexOf);
  17.     }
  18. }
  19.  
  20. public static class Test
  21. {
  22.     public static void Main()
  23.     {
  24.         var list = new List<int> { 10, 11, 23, 34, 56, 43 };
  25.         var indices = list.FindIndices(value => value > 23);
  26.  
  27.         foreach(var index in indices)
  28.         {
  29.             Console.WriteLine(index);
  30.         }
  31.     }
  32. }
Success #stdin #stdout 0.04s 34104KB
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https://ideone.com/NWL217
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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