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e.g. 5.26 Querying Without LINQ

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Jason Zhu 2021-07-15 16:56:14 +10:00
parent a376175c76
commit e2aa8c7cba
1 changed files with 20 additions and 17 deletions
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37
chap5_essential_language_features/essential_csharp_features/Program.cs
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@ -1,6 +1,7 @@
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using automatically_implemented_properties;
namespace automatically_implemented_properties
@ -9,29 +10,31 @@ namespace automatically_implemented_properties
{
static void Main(string[] args)
{
// create and populate Shopping Cart, implementing IEnumerable<Product> interface
IEnumerable<Product> products = new ShoppingCart
Product[] products =
{
Products = new List<Product>
{
new Product {Name = "Kayak", Category = "Watersports", Price = 275M},
new Product {Name = "Lifejacket", Category = "Watersports", Price = 48.95M},
new Product {Name = "Soccer ball", Category = "Soccer", Price = 19.50M},
new Product {Name = "Corner flag", Category = "Soccer", Price = 34.95M}
}
new Product {Name = "Kayak", Category = "Watersports", Price = 275M},
new Product {Name = "Lifejacket", Category = "Watersports", Price = 48.95M},
new Product {Name = "Soccer ball", Category = "Soccer", Price = 19.50M},
new Product {Name = "Corner flag", Category = "Soccer", Price = 34.95M}
};
IEnumerable<Product> filteredProducts = products.Filter(prod =>
prod.Category == "Soccer" ||
prod.Price > 20);
foreach (Product prod in filteredProducts)
// define the array to hold results
Product[] results = new Product[3];
// sort the contents of the array
Array.Sort(products, (item1, item2) =>
{
Console.WriteLine("Name: {0}, Price {1:c}", prod.Name, prod.Price);
return Comparer<decimal>.Default.Compare(item1.Price, item2.Price);
});
// get the first three items in the array as the results
Array.Copy(products, results, 3);
// print out the name
foreach (Product p in results)
{
Console.WriteLine("Item: {0}, Cost: {1}", p.Name, p.Price);
}
decimal total = products.FilterByCategory("Soccer").TotalPrices();
Console.WriteLine("Filtered total: {0:c}", total);
int count = 0;
// print the name
}
}