using System; using System.Collections.Generic; using System.Linq; using System.Text; public class MainClass { public static void Main() { string[] words = { "cherry", "apple", "blueberry" }; double totalChars = words.Sum(w => w.Length); Console.WriteLine("There are a total of {0} characters in these words.", totalChars); } }
LINQ
use Sum to find the total of all of the numbers in an integer array.
using System; using System.Collections.Generic; using System.Linq; using System.Text; public class MainClass { public static void Main() { int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 }; double numSum = numbers.Sum(); Console.WriteLine("The sum of the numbers is {0}.", numSum); } }
use Linq Sum to sum an array
using System; using System.Collections; using System.Collections.Generic; using System.Text; using System.Linq; using System.Reflection; public class MainClass{ public static void Main(){ int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; var query = numbers.Sum(); } }
uses a subquery to sort String
using System; using System.Collections.Generic; using System.Linq; public class MainClass { public static void Main() { string[] musos = { "D C", "R B", "W A" }; IEnumerable<string> query = musos.OrderBy(m => m.Split().Last()); } }
A subquery is a query contained within another query's lambda expression.
using System; using System.Collections.Generic; using System.Linq; public class MainClass { public static void Main() { string[] musos = { "D G", "R W", "R W" }; IEnumerable<string> query = musos.OrderBy(m => m.Split().Last()); } }
Use LINQ to SQL
using System; using System.Linq; using System.Data.Linq; using System.Data.Linq.Mapping; static class HelloLinqToSql { [Table(Name = "Contacts")] class Contact { [Column(IsPrimaryKey = true)] public int ContactID { get; set; } [Column(Name = "ContactName")] public string Name { get; set; } [Column] public string City { get; set; } } static void Main() { string path = System.IO.Path.GetFullPath("northwnd.mdf"); DataContext db = new DataContext(path); var contacts = from contact in db.GetTable<Contact>() where contact.City == "Paris" select contact; foreach (var contact in contacts) Console.WriteLine("Bonjour " + contact.Name); } }
Second SkipWhile Prototype
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
string[] presidents = {“ant”, “arding”, “arrison”, “Hayes”, “Hoover”, “ackson”};
IEnumerable