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copied!<p><strong>According to documentation:</strong></p> <p>List.Exists (Object method)</p> <blockquote> <p>Determines whether the List(T) contains elements that match the conditions defined by the specified predicate.</p> </blockquote> <p>IEnumerable.Any (Extension method)</p> <blockquote> <p>Determines whether any element of a sequence satisfies a condition.</p> </blockquote> <p>List.Contains (Object Method)</p> <blockquote> <p>Determines whether an element is in the List.</p> </blockquote> <p><strong>Benchmarking:</strong></p> <p><strong><em>CODE:</em></strong></p> <pre><code> static void Main(string[] args) { ContainsExistsAnyShort(); ContainsExistsAny(); } private static void ContainsExistsAny() { Console.WriteLine("***************************************"); Console.WriteLine("********* ContainsExistsAny ***********"); Console.WriteLine("***************************************"); List<int> list = new List<int>(6000000); Random random = new Random(); for (int i = 0; i < 6000000; i++) { list.Add(random.Next(6000000)); } int[] arr = list.ToArray(); find(list, arr); } private static void ContainsExistsAnyShort() { Console.WriteLine("***************************************"); Console.WriteLine("***** ContainsExistsAnyShortRange *****"); Console.WriteLine("***************************************"); List<int> list = new List<int>(2000); Random random = new Random(); for (int i = 0; i < 2000; i++) { list.Add(random.Next(6000000)); } int[] arr = list.ToArray(); find(list, arr); } private static void find(List<int> list, int[] arr) { Random random = new Random(); int[] find = new int[10000]; for (int i = 0; i < 10000; i++) { find[i] = random.Next(6000000); } Stopwatch watch = Stopwatch.StartNew(); for (int rpt = 0; rpt < 10000; rpt++) { list.Contains(find[rpt]); } watch.Stop(); Console.WriteLine("List/Contains: {0:N0}ms", watch.ElapsedMilliseconds); watch = Stopwatch.StartNew(); for (int rpt = 0; rpt < 10000; rpt++) { list.Exists(a => a == find[rpt]); } watch.Stop(); Console.WriteLine("List/Exists: {0:N0}ms", watch.ElapsedMilliseconds); watch = Stopwatch.StartNew(); for (int rpt = 0; rpt < 10000; rpt++) { list.Any(a => a == find[rpt]); } watch.Stop(); Console.WriteLine("List/Any: {0:N0}ms", watch.ElapsedMilliseconds); watch = Stopwatch.StartNew(); for (int rpt = 0; rpt < 10000; rpt++) { arr.Contains(find[rpt]); } watch.Stop(); Console.WriteLine("Array/Contains: {0:N0}ms", watch.ElapsedMilliseconds); Console.WriteLine("Arrays do not have Exists"); watch = Stopwatch.StartNew(); for (int rpt = 0; rpt < 10000; rpt++) { arr.Any(a => a == find[rpt]); } watch.Stop(); Console.WriteLine("Array/Any: {0:N0}ms", watch.ElapsedMilliseconds); } </code></pre> <p><strong>RESULTS</strong></p> <pre class="lang-none prettyprint-override"><code>*************************************** ***** ContainsExistsAnyShortRange ***** *************************************** List/Contains: 96ms List/Exists: 146ms List/Any: 381ms Array/Contains: 34ms Arrays do not have Exists Array/Any: 410ms *************************************** ********* ContainsExistsAny *********** *************************************** List/Contains: 257,996ms List/Exists: 379,951ms List/Any: 884,853ms Array/Contains: 72,486ms Arrays do not have Exists Array/Any: 1,013,303ms </code></pre>

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