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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Drawing; using System.Drawing.Imaging; public static class CollectionsExtensions {     public static List<int> FindAllIndex<T>(this List<T> container, Predicate<T> match)     {         var items = container.FindAll(match);         List<int> indexes = new List<int>();         foreach (var item in items)         {             indexes.Add(container.IndexOf(item));         }         return indexes;     } }