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namespace ParallelTasks { using System; using System.IO; using System.Linq; using System.Text; using System.Threading; using System.Threading.Tasks; using System.Net; class ParallelInvoke { static void Main() { // Retrieve Darwin's "Origin of the Species" from Gutenberg.org. string[] words = CreateWordArray(@"http://www.gutenberg.org/files/2009/2009.txt"); #region ParallelTasks // Perform three tasks in parallel on the source array Parallel.Invoke(() => { Console.WriteLine("Begin first task..."); GetLongestWord(words); }, // close first Action () => { Console.WriteLine("Begin second task..."); GetMostCommonWords(words); }, //close second Action () => { Console.WriteLine("Begin third task..."); GetCountForWord(words, "species"); } //close third Action ); //close parallel.invoke Console.WriteLine("Returned from Parallel.Invoke"); #endregion Console.WriteLine("Press any key to exit"); Console.ReadKey(); } #region HelperMethods private static void GetCountForWord(string[] words, string term) { var findWord = from word in words where word.ToUpper().Contains(term.ToUpper()) select word; Console.WriteLine(@"Task 3 -- The word ""{0}"" occurs {1} times.", term, findWord.Count()); } private static void GetMostCommonWords(string[] words) { var frequencyOrder = from word in words where word.Length > 6 group word by word into g orderby g.Count() descending select g.Key; var commonWords = frequencyOrder.Take(10); StringBuilder sb = new StringBuilder(); sb.AppendLine("Task 2 -- The most common words are:"); foreach (var v in commonWords) { sb.AppendLine(" " + v); } Console.WriteLine(sb.ToString()); } private static string GetLongestWord(string[] words) { var longestWord = (from w in words orderby w.Length descending select w).First(); Console.WriteLine("Task 1 -- The longest word is {0}", longestWord); return longestWord; } // An http request performed synchronously for simplicity. static string[] CreateWordArray(string uri) { Console.WriteLine("Retrieving from {0}", uri); // Download a web page the easy way. string s = new WebClient().DownloadString(uri); // Separate string into an array of words, removing some common punctuation. return s.Split( new char[] { ' ', '\u000A', ',', '.', ';', ':', '-', '_', '/' }, StringSplitOptions.RemoveEmptyEntries); } #endregion } /* Output (May vary on each execution): Retrieving from http://www.gutenberg.org/dirs/etext99/otoos610.txt Response stream received. Begin first task... Begin second task... Task 2 -- The most common words are: species selection varieties natural animals between different distinct several conditions Begin third task... Task 1 -- The longest word is characteristically Task 3 -- The word "species" occurs 1927 times. Returned from Parallel.Invoke Press any key to exit */ } |