// BOOK p103 - using an asynchronous Enumerable
public async Task <ViewResult> Index_p103()
{
List <string> output = new List <string>();
await foreach (long?len in MyAsyncMethods.GetPageLengths(output, "apress.com", "microsoft.com", "amazon.co.uk"))
{
output.Add($"Page length: {len}");
}
return(View(output));
}
public async Task <IActionResult> IndexAsync()
{
List <string> output = new List <string>();
//foreach (long? len in await MyAsyncMethods.GetPageLengths(output, "apress.com", "microsoft.com", "amazon.com"))
//{
// output.Add($"Page length: { len}");
//}
await foreach (long?len in MyAsyncMethods.GetPageLengths(output, "apress.com", "microsoft.com", "amazon.com"))
{
output.Add($"Page length: { len}");
}
return(View());
}
// bool FilterByPrice(Product p)
// {
// return (p?.Price ?? 0) >= 20;
// }
public async Task <ViewResult> Index()
{
#region
// //The null conditional operator allows for null values to be detected more elegantly(thanh lich) :).
// List<string> results = new List<string>();
// foreach (Product p in Product.GetProducts())
// {
// // string name = p?.Name;
// // decimal? price = p?.Price;
// // string relatedName = p?.Related?.Name;
// //Combining the Conditional and Coalescing Operators
// string name = p?.Name ?? "<No Name>";
// decimal? price = p?.Price ?? 0;
// string relatedName = p?.Related?.Name ?? "<None>";
// // results.Add(string.Format("Name: {0}, Price: {1}", name, price));
// results.Add(string.Format("Name: {0}, Price: {1}, Related: {2}", name, price, relatedName));
// }
// return View(results);
// // return View(new string[] { "C#", "Language", "Features" });
//----------------------------------------------------------------
// Using Object and Collection Initializers
// string[] names = new string[3];
// names[0] = "Bob";
// names[1] = "Joe";
// names[2] = "Alice";
// return View("Index", names);
// return View("Index", new string[] { "Bob", "Joe", "Alice" });
//--------------------------------
// Using an Index Initializer
// Dictionary<string, Product> products = new Dictionary<string, Product> {
// { "Kayak", new Product { Name = "Kayak", Price = 275M } }
// , { "Lifejacket", new Product{ Name = "Lifejacket", Price = 48.95M } }
// };
// return View("Index", products.Keys);
// Dictionary<string, Product> products = new Dictionary<string, Product> {
// ["Kayak"] = new Product { Name = "Kayak", Price = 275M }
// , ["Lifejacket"] = new Product { Name = "Lifejacket", Price = 48.95M }
// };
// return View("Index", products.Keys);
//Pattern matching
// object[] data = new object[] { 275M, 29.95M, "apple", "orange", 100, 10 };
// decimal total = 0;
// for (int i = 0; i < data.Length; i++)
// {
// if (data[i] is decimal d)
// {
// total += d;
// }
// }
// return View("Index", new string[] { $"Total: {total:C2}" });
//Pattern Matching in switch Statements
// for (int i = 0; i < data.Length; i++) {
// switch (data[i]) {
// case decimal decimalValue:
// total += decimalValue;
// break;
// case int intValue when intValue > 50:
// total += intValue;
// break;
// }
// }
// return View("Index", new string[] { $"Total: {total:C2}" });
// ShoppingCart cart = new ShoppingCart { Products = Product.GetProducts() };
// Product[] productArray = { new Product {Name = "Kayak", Price = 275M},
// new Product {Name = "Lifejacket", Price = 48.95M} };
// decimal cartTotal = cart.TotalPrices();
// decimal arrayTotal = productArray.TotalPrices();
// return View("Index", new string[] {
// $"Cart Total: {cartTotal:C2}",
// $"Array Total: {arrayTotal:C2}" });
// Product[] productArray = {
// new Product {Name = "Kayak", Price = 275M},
// new Product {Name = "Lifejacket", Price = 48.95M},
// new Product {Name = "Soccer ball", Price = 19.50M},
// new Product {Name = "Corner flag", Price = 34.95M} };
// decimal arrayTotal = productArray.FilterByPrice(20).TotalPrices();
// decimal priceFilterTotal = productArray.FilterByPrice(20).TotalPrices();
// decimal nameFilterTotal = productArray.FilterByName('S').TotalPrices();
// // return View("Index", new string[] { $"Array Total: {arrayTotal:C2}" });
// return View("Index", new string[] {
// $"Price Total: {priceFilterTotal:C2}"
// , $"Name Total: {nameFilterTotal:C2}" });
// / khoong cos cachs tiep can naof la lys tuongw
// Func<Product, bool> nameFilter = delegate (Product prod)
// {
// return prod?.Name?[0] == 'S';
// };
// decimal priceFilterTotal = productArray.Filter(FilterByPrice).TotalPrices();
// decimal nameFilterTotal = productArray.Filter(nameFilter).TotalPr
// decimal priceFilterTotal = productArray.Filter(p => (p?.Price ?? 0) >= 20).TotalPrices();
// decimal nameFilterTotal = productArray.Filter(p => p?.Name?[0] == 'S').TotalPrices();
// return View("Index", new string[] {$"Price TOTAL: {priceFilterTotal:C2}",
// $"Name Total: {nameFilterTotal:C2}"});
// return View(Product.GetProducts().Select(p=> p?.Name));
//Using anonymous type
// var names = new [] { "Kayak", "Lifejacket", "Soccer ball"};
// return View(names);
// var products = new[] {
// new { Name = "Kayak", Price = 275M },
// new { Name = "Lifejacket", Price = 48.95M },
// new { Name = "Soccer ball", Price = 19.50M },
// new { Name = "Corner flag", Price = 34.95M }
// };
// return View(products.Select(p => p.Name));
// return View(products.Select(p => p.GetType().Name));
//Using Default Implementations in Interfaces
// IProductSelection cart = new ShoppingCart(
// new Product { Name = "Kayak", Price = 275M },
// new Product { Name = "Lifejacket", Price = 48.95M },
// new Product { Name = "Soccer ball", Price = 19.50M },
// new Product { Name = "Corner flag", Price = 34.95M });
// // return View(cart.Products.Select(p => p.Name));
// return View(cart.Names);
#endregion
//Using Asynchronous Methods
// long? length = await MyAsyncMethods.GetPageLength();
// return View(new string[] { $"Length: {length}"
// });
List <string> output = new List <string>();
await foreach (long?len in MyAsyncMethods.GetPageLengths(output, "apress.com", "microsoft.com", "amazon.com"))
{
output.Add($"Page length: { len}");
}
return(View(output));
}
