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Linq编程101例及个人补充
- Part1 - Restriction Operators
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- Program.cs
1 using System; 2 3 namespace Linq101 4 { 5 internal class Program 6 { 7 private static void Main(string[] args) 8 { 9 #region Restriction10 Restriction restriction = new Restriction();11 //restriction.Simple1();//找出小于5的数字12 //restriction.Simple2();//找出没有库存的货物13 //restriction.Simple3();//找出有库存，且售价大于3.00的货物14 //restriction.Simple4();//找出在华盛顿的客户，并用结果钻取他们的订单15 //restriction.Simple5();//找出单词长度小于其数值的数字16 restriction.Simple5plus1();//有一个整数数组，我们找出这个数字是否跟他在这个数组的位置一样 17 #endregion18 19 Console.ReadLine();20 }21 }22 }
- Data.cs
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Xml.Linq; 5 6 namespace Linq101 7 { 8 class Data 9 { 10 public class Product 11 { 12 public int ProductID { get; set; } 13 public string ProductName { get; set; } 14 public string Category { get; set; } 15 public decimal UnitPrice { get; set; } 16 public int UnitsInStock { get; set; } 17 } 18 19 public class Order 20 { 21 public int OrderID { get; set; } 22 public DateTime OrderDate { get; set; } 23 public decimal Total { get; set; } 24 } 25 26 public class Customer 27 { 28 public string CustomerID { get; set; } 29 public string CompanyName { get; set; } 30 public string Address { get; set; } 31 public string City { get; set; } 32 public string Region { get; set; } 33 public string PostalCode { get; set; } 34 public string Country { get; set; } 35 public string Phone { get; set; } 36 public string Fax { get; set; } 37 public Order[] Orders { get; set; } 38 } 39 40 private static List<Product> productList; 41 private static List<Customer> customerList; 42 43 public static List<Product> GetProductList() 44 { 45 if (productList == null) 46 CreateLists(); 47 48 return productList; 49 } 50 51 public static List<Customer> GetCustomerList() 52 { 53 if (customerList == null) 54 CreateLists(); 55 56 return customerList; 57 } 58 59 private static void CreateLists() 60 { 61 // Product data created in-memory using collection initializer: 62 productList = 63 new List<Product> { 64 new Product { ProductID = 1, ProductName = "Chai", Category = "Beverages", UnitPrice = 18.0000M, UnitsInStock = 39 }, 65 new Product { ProductID = 2, ProductName = "Chang", Category = "Beverages", UnitPrice = 19.0000M, UnitsInStock = 17 }, 66 new Product { ProductID = 3, ProductName = "Aniseed Syrup", Category = "Condiments", UnitPrice = 10.0000M, UnitsInStock = 13 }, 67 new Product { ProductID = 4, ProductName = "Chef Anton‘s Cajun Seasoning", Category = "Condiments", UnitPrice = 22.0000M, UnitsInStock = 53 }, 68 new Product { ProductID = 5, ProductName = "Chef Anton‘s Gumbo Mix", Category = "Condiments", UnitPrice = 21.3500M, UnitsInStock = 0 }, 69 new Product { ProductID = 6, ProductName = "Grandma‘s Boysenberry Spread", Category = "Condiments", UnitPrice = 25.0000M, UnitsInStock = 120 }, 70 new Product { ProductID = 7, ProductName = "Uncle Bob‘s Organic Dried Pears", Category = "Produce", UnitPrice = 30.0000M, UnitsInStock = 15 }, 71 new Product { ProductID = 8, ProductName = "Northwoods Cranberry Sauce", Category = "Condiments", UnitPrice = 40.0000M, UnitsInStock = 6 }, 72 new Product { ProductID = 9, ProductName = "Mishi Kobe Niku", Category = "Meat/Poultry", UnitPrice = 97.0000M, UnitsInStock = 29 }, 73 new Product { ProductID = 10, ProductName = "Ikura", Category = "Seafood", UnitPrice = 31.0000M, UnitsInStock = 31 }, 74 new Product { ProductID = 11, ProductName = "Queso Cabrales", Category = "Dairy Products", UnitPrice = 21.0000M, UnitsInStock = 22 }, 75 new Product { ProductID = 12, ProductName = "Queso Manchego La Pastora", Category = "Dairy Products", UnitPrice = 38.0000M, UnitsInStock = 86 }, 76 new Product { ProductID = 13, ProductName = "Konbu", Category = "Seafood", UnitPrice = 6.0000M, UnitsInStock = 24 }, 77 new Product { ProductID = 14, ProductName = "Tofu", Category = "Produce", UnitPrice = 23.2500M, UnitsInStock = 35 }, 78 new Product { ProductID = 15, ProductName = "Genen Shouyu", Category = "Condiments", UnitPrice = 15.5000M, UnitsInStock = 39 }, 79 new Product { ProductID = 16, ProductName = "Pavlova", Category = "Confections", UnitPrice = 17.4500M, UnitsInStock = 29 }, 80 new Product { ProductID = 17, ProductName = "Alice Mutton", Category = "Meat/Poultry", UnitPrice = 39.0000M, UnitsInStock = 0 }, 81 new Product { ProductID = 18, ProductName = "Carnarvon Tigers", Category = "Seafood", UnitPrice = 62.5000M, UnitsInStock = 42 }, 82 new Product { ProductID = 19, ProductName = "Teatime Chocolate Biscuits", Category = "Confections", UnitPrice = 9.2000M, UnitsInStock = 25 }, 83 new Product { ProductID = 20, ProductName = "Sir Rodney‘s Marmalade", Category = "Confections", UnitPrice = 81.0000M, UnitsInStock = 40 }, 84 new Product { ProductID = 21, ProductName = "Sir Rodney‘s Scones", Category = "Confections", UnitPrice = 10.0000M, UnitsInStock = 3 }, 85 new Product { ProductID = 22, ProductName = "Gustaf‘s Knäckebröd", Category = "Grains/Cereals", UnitPrice = 21.0000M, UnitsInStock = 104 }, 86 new Product { ProductID = 23, ProductName = "Tunnbröd", Category = "Grains/Cereals", UnitPrice = 9.0000M, UnitsInStock = 61 }, 87 new Product { ProductID = 24, ProductName = "Guaraná Fantástica", Category = "Beverages", UnitPrice = 4.5000M, UnitsInStock = 20 }, 88 new Product { ProductID = 25, ProductName = "NuNuCa Nuß-Nougat-Creme", Category = "Confections", UnitPrice = 14.0000M, UnitsInStock = 76 }, 89 new Product { ProductID = 26, ProductName = "Gumbär Gummibärchen", Category = "Confections", UnitPrice = 31.2300M, UnitsInStock = 15 }, 90 new Product { ProductID = 27, ProductName = "Schoggi Schokolade", Category = "Confections", UnitPrice = 43.9000M, UnitsInStock = 49 }, 91 new Product { ProductID = 28, ProductName = "Rössle Sauerkraut", Category = "Produce", UnitPrice = 45.6000M, UnitsInStock = 26 }, 92 new Product { ProductID = 29, ProductName = "Thüringer Rostbratwurst", Category = "Meat/Poultry", UnitPrice = 123.7900M, UnitsInStock = 0 }, 93 new Product { ProductID = 30, ProductName = "Nord-Ost Matjeshering", Category = "Seafood", UnitPrice = 25.8900M, UnitsInStock = 10 }, 94 new Product { ProductID = 31, ProductName = "Gorgonzola Telino", Category = "Dairy Products", UnitPrice = 12.5000M, UnitsInStock = 0 }, 95 new Product { ProductID = 32, ProductName = "Mascarpone Fabioli", Category = "Dairy Products", UnitPrice = 32.0000M, UnitsInStock = 9 }, 96 new Product { ProductID = 33, ProductName = "Geitost", Category = "Dairy Products", UnitPrice = 2.5000M, UnitsInStock = 112 }, 97 new Product { ProductID = 34, ProductName = "Sasquatch Ale", Category = "Beverages", UnitPrice = 14.0000M, UnitsInStock = 111 }, 98 new Product { ProductID = 35, ProductName = "Steeleye Stout", Category = "Beverages", UnitPrice = 18.0000M, UnitsInStock = 20 }, 99 new Product { ProductID = 36, ProductName = "Inlagd Sill", Category = "Seafood", UnitPrice = 19.0000M, UnitsInStock = 112 },100 new Product { ProductID = 37, ProductName = "Gravad lax", Category = "Seafood", UnitPrice = 26.0000M, UnitsInStock = 11 },101 new Product { ProductID = 38, ProductName = "Côte de Blaye", Category = "Beverages", UnitPrice = 263.5000M, UnitsInStock = 17 },102 new Product { ProductID = 39, ProductName = "Chartreuse verte", Category = "Beverages", UnitPrice = 18.0000M, UnitsInStock = 69 },103 new Product { ProductID = 40, ProductName = "Boston Crab Meat", Category = "Seafood", UnitPrice = 18.4000M, UnitsInStock = 123 },104 new Product { ProductID = 41, ProductName = "Jack‘s New England Clam Chowder", Category = "Seafood", UnitPrice = 9.6500M, UnitsInStock = 85 },105 new Product { ProductID = 42, ProductName = "Singaporean Hokkien Fried Mee", Category = "Grains/Cereals", UnitPrice = 14.0000M, UnitsInStock = 26 },106 new Product { ProductID = 43, ProductName = "Ipoh Coffee", Category = "Beverages", UnitPrice = 46.0000M, UnitsInStock = 17 },107 new Product { ProductID = 44, ProductName = "Gula Malacca", Category = "Condiments", UnitPrice = 19.4500M, UnitsInStock = 27 },108 new Product { ProductID = 45, ProductName = "Rogede sild", Category = "Seafood", UnitPrice = 9.5000M, UnitsInStock = 5 },109 new Product { ProductID = 46, ProductName = "Spegesild", Category = "Seafood", UnitPrice = 12.0000M, UnitsInStock = 95 },110 new Product { ProductID = 47, ProductName = "Zaanse koeken", Category = "Confections", UnitPrice = 9.5000M, UnitsInStock = 36 },111 new Product { ProductID = 48, ProductName = "Chocolade", Category = "Confections", UnitPrice = 12.7500M, UnitsInStock = 15 },112 new Product { ProductID = 49, ProductName = "Maxilaku", Category = "Confections", UnitPrice = 20.0000M, UnitsInStock = 10 },113 new Product { ProductID = 50, ProductName = "Valkoinen suklaa", Category = "Confections", UnitPrice = 16.2500M, UnitsInStock = 65 },114 new Product { ProductID = 51, ProductName = "Manjimup Dried Apples", Category = "Produce", UnitPrice = 53.0000M, UnitsInStock = 20 },115 new Product { ProductID = 52, ProductName = "Filo Mix", Category = "Grains/Cereals", UnitPrice = 7.0000M, UnitsInStock = 38 },116 new Product { ProductID = 53, ProductName = "Perth Pasties", Category = "Meat/Poultry", UnitPrice = 32.8000M, UnitsInStock = 0 },117 new Product { ProductID = 54, ProductName = "Tourtière", Category = "Meat/Poultry", UnitPrice = 7.4500M, UnitsInStock = 21 },118 new Product { ProductID = 55, ProductName = "Pâté chinois", Category = "Meat/Poultry", UnitPrice = 24.0000M, UnitsInStock = 115 },119 new Product { ProductID = 56, ProductName = "Gnocchi di nonna Alice", Category = "Grains/Cereals", UnitPrice = 38.0000M, UnitsInStock = 21 },120 new Product { ProductID = 57, ProductName = "Ravioli Angelo", Category = "Grains/Cereals", UnitPrice = 19.5000M, UnitsInStock = 36 },121 new Product { ProductID = 58, ProductName = "Escargots de Bourgogne", Category = "Seafood", UnitPrice = 13.2500M, UnitsInStock = 62 },122 new Product { ProductID = 59, ProductName = "Raclette Courdavault", Category = "Dairy Products", UnitPrice = 55.0000M, UnitsInStock = 79 },123 new Product { ProductID = 60, ProductName = "Camembert Pierrot", Category = "Dairy Products", UnitPrice = 34.0000M, UnitsInStock = 19 },124 new Product { ProductID = 61, ProductName = "Sirop d‘érable", Category = "Condiments", UnitPrice = 28.5000M, UnitsInStock = 113 },125 new Product { ProductID = 62, ProductName = "Tarte au sucre", Category = "Confections", UnitPrice = 49.3000M, UnitsInStock = 17 },126 new Product { ProductID = 63, ProductName = "Vegie-spread", Category = "Condiments", UnitPrice = 43.9000M, UnitsInStock = 24 },127 new Product { ProductID = 64, ProductName = "Wimmers gute Semmelknödel", Category = "Grains/Cereals", UnitPrice = 33.2500M, UnitsInStock = 22 },128 new Product { ProductID = 65, ProductName = "Louisiana Fiery Hot Pepper Sauce", Category = "Condiments", UnitPrice = 21.0500M, UnitsInStock = 76 },129 new Product { ProductID = 66, ProductName = "Louisiana Hot Spiced Okra", Category = "Condiments", UnitPrice = 17.0000M, UnitsInStock = 4 },130 new Product { ProductID = 67, ProductName = "Laughing Lumberjack Lager", Category = "Beverages", UnitPrice = 14.0000M, UnitsInStock = 52 },131 new Product { ProductID = 68, ProductName = "Scottish Longbreads", Category = "Confections", UnitPrice = 12.5000M, UnitsInStock = 6 },132 new Product { ProductID = 69, ProductName = "Gudbrandsdalsost", Category = "Dairy Products", UnitPrice = 36.0000M, UnitsInStock = 26 },133 new Product { ProductID = 70, ProductName = "Outback Lager", Category = "Beverages", UnitPrice = 15.0000M, UnitsInStock = 15 },134 new Product { ProductID = 71, ProductName = "Flotemysost", Category = "Dairy Products", UnitPrice = 21.5000M, UnitsInStock = 26 },135 new Product { ProductID = 72, ProductName = "Mozzarella di Giovanni", Category = "Dairy Products", UnitPrice = 34.8000M, UnitsInStock = 14 },136 new Product { ProductID = 73, ProductName = "Röd Kaviar", Category = "Seafood", UnitPrice = 15.0000M, UnitsInStock = 101 },137 new Product { ProductID = 74, ProductName = "Longlife Tofu", Category = "Produce", UnitPrice = 10.0000M, UnitsInStock = 4 },138 new Product { ProductID = 75, ProductName = "Rhönbräu Klosterbier", Category = "Beverages", UnitPrice = 7.7500M, UnitsInStock = 125 },139 new Product { ProductID = 76, ProductName = "Lakkalikööri", Category = "Beverages", UnitPrice = 18.0000M, UnitsInStock = 57 },140 new Product { ProductID = 77, ProductName = "Original Frankfurter grüne Soße", Category = "Condiments", UnitPrice = 13.0000M, UnitsInStock = 32 }141 };142 143 // Customer/Order data read into memory from XML file using XLinq:144 customerList = (145 from e in XDocument.Load("Customers.xml").146 Root.Elements("customer")147 select new Customer148 {149 CustomerID = (string)e.Element("id"),150 CompanyName = (string)e.Element("name"),151 Address = (string)e.Element("address"),152 City = (string)e.Element("city"),153 Region = (string)e.Element("region"),154 PostalCode = (string)e.Element("postalcode"),155 Country = (string)e.Element("country"),156 Phone = (string)e.Element("phone"),157 Fax = (string)e.Element("fax"),158 Orders = (159 from o in e.Elements("orders").Elements("order")160 select new Order161 {162 OrderID = (int)o.Element("id"),163 OrderDate = (DateTime)o.Element("orderdate"),164 Total = (decimal)o.Element("total")165 })166 .ToArray()167 })168 .ToList();169 }170 }171 }Linq编程101例及个人补充
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