1 using System;  2 using System.Collections.Generic;  3 using System.Linq;  4   5 namespace Linq101  6 {  7     class Set  8     {  9         /// <summary> 10         /// This sample uses Distinct to remove duplicate elements in a sequence of factors of 300. 11         /// </summary> 12         public void Linq46() 13         { 14             int[] factorsOf300 = { 2, 2, 3, 5, 5 }; 15  16             var uniqueFactors = factorsOf300.Distinct(); 17  18             Console.WriteLine("300的因数："); 19             foreach (var factor in uniqueFactors) 20             { 21                 Console.WriteLine(factor); 22             } 23         } 24  25         /// <summary> 26         /// This sample uses Distinct to find the unique Category names. 27         /// </summary> 28         public void Linq47() 29         { 30             List<Data.Product> products = Data.GetProductList(); 31  32             var categoryNames = (from p in products 33                                  select p.Category).Distinct(); 34  35             Console.WriteLine("种类名称："); 36             ObjectDumper.Write(categoryNames); 37         } 38  39         /// <summary> 40         /// This sample uses Union to create one sequence that contains the unique values from both arrays. 41         /// </summary> 42         public void Linq48() 43         { 44             int[] numbersA = { 0, 2, 4, 5, 6, 8, 9 }; 45             int[] numbersB = { 1, 3, 5, 7, 8 }; 46  47             var uniqueNumbers = numbersA.Union(numbersB); 48  49             Console.WriteLine("Unique numbers from both arrays:"); 50             ObjectDumper.Write(uniqueNumbers); 51         } 52  53         /// <summary> 54         /// This sample uses Union to create one sequence that contains the unique first letter from both product and customer names. 55         /// </summary> 56         public void Linq49() 57         { 58             List<Data.Product> products = Data.GetProductList(); 59             List<Data.Customer> customers = Data.GetCustomerList(); 60  61             var productFirstChar = from p in products select p.ProductName[0]; 62             var customerFirstChar = from c in customers select c.CompanyName[0]; 63  64             var uniqueFirstChar = productFirstChar.Union(customerFirstChar); 65  66             Console.WriteLine("Unique First Char:"); 67             ObjectDumper.Write(uniqueFirstChar); 68         } 69  70         /// <summary> 71         /// This sample uses Intersect to create one sequence that contains the common values shared by both arrays. 72         /// </summary> 73         public void Linq50() 74         { 75             int[] numbersA = { 0, 2, 4, 5, 6, 8, 9 }; 76             int[] numbersB = { 1, 3, 5, 7, 8 }; 77  78             var commonNumbers = numbersA.Intersect(numbersB); 79  80             Console.WriteLine("共有的数字："); 81             ObjectDumper.Write(commonNumbers); 82         } 83  84         /// <summary> 85         /// This sample uses Intersect to create one sequence that contains the common first letter from both product and customer names. 86         /// </summary> 87         public void Linq51() 88         { 89             List<Data.Product> products = Data.GetProductList(); 90             List<Data.Customer> customers = Data.GetCustomerList(); 91  92             var productFirstChar = from p in products select p.ProductName[0]; 93             var customerFirstChar = from c in customers select c.CompanyName[0]; 94  95             var commonFirstChar = productFirstChar.Intersect(customerFirstChar); 96  97             Console.WriteLine("Common First Char"); 98             ObjectDumper.Write(commonFirstChar); 99         }100 101         /// <summary>102         /// This sample uses Except to create a sequence that contains the values from numbersAthat are not also in numbersB.103         /// </summary>104         public void Linq52()105         {106             int[] numbersA = { 0, 2, 4, 5, 6, 8, 9 };107             int[] numbersB = { 1, 3, 5, 7, 8 };108 109             var aOnlyNumbers = numbersA.Except(numbersB);110 111             Console.WriteLine("Numbers in arrayA but no ArrayB");112             ObjectDumper.Write(aOnlyNumbers);113         }114 115         /// <summary>116         /// This sample uses Except to create one sequence that contains the first letters of product names that are not also first letters of customer names.117         /// </summary>118         public void Linq53()119         {120             List<Data.Product> products = Data.GetProductList();121             List<Data.Customer> customers = Data.GetCustomerList();122 123             var productFirstChar = from p in products select p.ProductName[0];124             var customerFirstChar = from c in customers select c.CompanyName[0];125 126             var productOnlyFirstChar = productFirstChar.Except(customerFirstChar);127 128             Console.WriteLine("First char only in productFirstChar");129             ObjectDumper.Write(productOnlyFirstChar);130         }131     }132 }