.NET 4.0 - LINQ– Neue Extension Method: Zip

   1:  int[] numbers = { 1, 2, 3, 4 };

   2:  string[] words = { "one", "two", "three" };

   3:   

   4:  var numbersAndWords = numbers.Zip(words, (first, second) => first + " " + second);

   5:  foreach (var item in numbersAndWords)

   6:    Console.WriteLine(item);

   7:   

   8:  // This code produces the following output:

   9:   

  10:  // 1 one

  11:  // 2 two

  12:  // 3 three

   1:  using System;

   2:  using System.Collections.Generic;

   3:  using System.Linq;

   4:   

   5:  namespace LinqWithZipExample

   6:  {

   7:      class Program

   8:      {

   9:          static void Main(string[] args)

  10:          {

  11:              // Arrange

  12:              List<Category> categories = new List<Category>();

  13:              Category category = new Category {ID = 1, Name = "Screen Designer"};

  14:              Category category2 = new Category {ID = 2, Name = "Developer"};

  15:              Category category3 = new Category {ID = 3, Name = "Solution Architect"};

  16:   

  17:              categories.Add(category);

  18:              categories.Add(category2);

  19:              categories.Add(category3);

  20:   

  21:              List<Employee> employees = new List<Employee>();

  22:              Employee employee = new Employee {Name = "Gregor Biswanger", Category = 3};

  23:              Employee employee2 = new Employee {Name = "Timo Winter", Category = 1};

  24:   

  25:              employees.Add(employee);

  26:              employees.Add(employee2);

  27:   

  28:              // Act

  29:              var result = employees.Zip(GetCategoryOfEmployee(employees, categories), (emp, cat) => emp.Name + " is " + cat.Name);

  30:              

  31:              // Output

  32:              foreach (string value in result)

  33:              {

  34:                  Console.WriteLine(value);

  35:              }

  36:   

  37:              Console.ReadLine();

  38:          }

  39:   

  40:          private static IEnumerable<Category> GetCategoryOfEmployee(IEnumerable<Employee> employees, IEnumerable<Category> categories)

  41:          {

  42:              return employees.SelectMany(employee => categories.Where(category => employee.Category == category.ID));

  43:          }

  44:      }

  45:   

  46:      internal class Category

  47:      {

  48:          public int ID { get; set; }

  49:          public string Name { get; set; }

  50:      }

  51:   

  52:      internal class Employee

  53:      {

  54:          public string Name { get; set; }

  55:          public int Category { get; set; }

  56:      }

  57:  }