CSharp C# Tuple Linq search get IEnumerable from List

CSharp C# Tuple Linq search get IEnumerable from List

meta: predicate

Output:

joe_Now.Item1 = Joe joe_Now.Item2 = Joe_First joe_Now.Item1 = Joe joe_Now.Item2 = Joe_Second press enter to finish

Program.cs:

using System; using System.Collections.Generic; using System.Linq; namespace ConsoleStuff {     class Program     {         static void Main(string[] args)         {             List<Tuple<string, string>> tupleCollectionOptionalClasses = new List<Tuple<string, string>>();             tupleCollectionOptionalClasses.Add(new Tuple<string, string>("Hank","Hank_First"));             tupleCollectionOptionalClasses.Add(new Tuple<string, string>("Joe", "Joe_First"));             tupleCollectionOptionalClasses.Add(new Tuple<string, string>("Mary", "Mary_First"));             tupleCollectionOptionalClasses.Add(new Tuple<string, string>("Joe", "Joe_Second"));             tupleCollectionOptionalClasses.Add(new Tuple<string, string>("Hank", "Hank_Second"));             IEnumerable<Tuple<string, string>> tuple_JustJoe = tupleCollectionOptionalClasses.Where(                   delegate(Tuple<string, string> mapNowFinder)                   {                       return mapNowFinder.Item1 == "Joe";  // case sensitive                   }                   );             foreach (Tuple<string, string> joe_Now in tuple_JustJoe)             {                 Console.WriteLine("joe_Now.Item1 = {0} joe_Now.Item2 = {1}", joe_Now.Item1, joe_Now.Item2);             }             Console.WriteLine();             Console.WriteLine("press enter to finish");             Console.ReadLine();         }     } }

CSharp C# example string split array to List object

CSharp C# example string split array to List object

This is a quick example of using the string  Split function directly to a System.Collections.Generic.List object and a quick Linq search

Key line:

List<string> listOfStuff = new List<string>(myCommaSeperatedListOfStuff.Split(new char[] { ',' }));

Output:

apple press enter to finish

Program.cs:

using System; using System.Collections.Generic; using System.Linq; namespace ConsoleStuff {     class Program     {         static void Main(string[] args)         {             string myCommaSeperatedListOfStuff = "one,two,apple,shoe";                        List<string> listOfStuff = new List<string>(myCommaSeperatedListOfStuff.Split(new char[] { ',' }));             Console.WriteLine(listOfStuff.First((findit) => findit == "apple"));             Console.WriteLine();             Console.WriteLine("press enter to finish");             Console.ReadLine();         }     } }

CSharp C# delegate predicate to find Tuple in a List

This example shows how to use a predicate to search for a Tuple (record) object.  

This example uses a List of type Tuple.

Output:

Program.cs:

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleStuff {    class Program    {        static void Main(string[] args)        {            List<Tuple<string, string, string>> DirsToUnmap = new List<Tuple<string, string, string>>();            {                Tuple<string, string, string> mapNow = new Tuple<string, string, string>("Alpha", "Beta", null);                DirsToUnmap.Add(mapNow);                Console.WriteLine("Just added the following Tuple to the List of Tuples:");                ShowTupleContent(mapNow);            }            {                Tuple<string, string, string> mapNow = new Tuple<string, string, string>("Alpha", "George", null);                DirsToUnmap.Add(mapNow);                Console.WriteLine("Just added the following Tuple to the List of Tuples:");                ShowTupleContent(mapNow);            }            Console.WriteLine("DirsToUnmap count = {0}", DirsToUnmap.Count);            {                Console.WriteLine("Checking to see if Tuple exists...");                Tuple<string, string, string> mapNow = new Tuple<string, string, string>("Alpha", "George", null);                ShowTupleContent(mapNow);                Console.WriteLine("Does the above Tuple exist in the List?  Ans: {0}", CheckIfTupleExists(DirsToUnmap, mapNow));            }            {                Console.WriteLine("Checking to see if Tuple exists...");                Tuple<string, string, string> mapNow = new Tuple<string, string, string>("Alpha", "Kevin", null);                ShowTupleContent(mapNow);                Console.WriteLine("Does the above Tuple exist in the List?  Ans: {0}", CheckIfTupleExists(DirsToUnmap, mapNow));            }            Console.ReadLine();        }            private static void ShowTupleContent(Tuple<string, string, string> tNow)            {                Console.ForegroundColor = ConsoleColor.Yellow;                Console.WriteLine("Tuple values now = {0}, {1}, {2}", tNow.Item1, tNow.Item2, tNow.Item3);                Console.ResetColor();            }        private static bool CheckIfTupleExists(List<Tuple<string, string, string>> DirsToUnmap, Tuple<string, string, string> mapNow )        {            return DirsToUnmap.Exists(                delegate(Tuple<string, string, string> mapNowFinder)                    {                        return mapNowFinder.Item1 == mapNow.Item1 && mapNowFinder.Item2 == mapNow.Item2 &&                               mapNowFinder.Item3 == mapNow.Item3;                    }                );        }    } }