public ProductsCollection Search(IProductSearchCriteria productSearchCriteria)
{
var result = new ProductsCollection();
foreach (var item in _list)
{
var product = (Product)item;
if (productSearchCriteria.isSatisfiedBy(product))
{
result.Add(product);
}
}
return(result);
}
public ProductsCollection Search(ProductCriteriaDelegate criteria)
{
var result = new ProductsCollection();
foreach (var item in _list)
{
var product = (Product)item;
if (criteria(product))
{
result.Add(product);
}
}
return(result);
}
static void Main(string[] args)
{
var products = new ProductsCollection();
products.Add(new Product()
{
Id = 108, Name = "Pen", Cost = 221, Units = 12
});
products.Add(new Product()
{
Id = 102, Name = "Hen", Cost = 218, Units = 62
});
products.Add(new Product()
{
Id = 106, Name = "Ken", Cost = 217, Units = 92
});
products.Add(new Product()
{
Id = 101, Name = "Ten", Cost = 245, Units = 27
});
products.Add(new Product()
{
Id = 109, Name = "Den", Cost = 223, Units = 23
});
products.Add(new Product()
{
Id = 105, Name = "Len", Cost = 210, Units = 24
});
Console.WriteLine("Initial List");
Console.WriteLine("Total Productsa = {0}", products.Count());
Console.WriteLine("=========================================");
foreach (var product in products)
{
Console.WriteLine(product);
}
/*var enumerator = (IEnumerator) products;
* while (enumerator.MoveNext())
* {
* var current = (Product) enumerator.Current;
* Console.WriteLine(current);
* }*/
/*for(var i=0;i<products.Count;i++)
* Console.WriteLine(products[i]);
*/
Console.WriteLine("=========================================");
Console.WriteLine("Products sorted by default order");
Console.WriteLine("=========================================");
products.Sort();
foreach (var product in products)
{
Console.WriteLine(product);
}
Console.WriteLine("=========================================");
Console.WriteLine("Products sorted by Cost");
Console.WriteLine("=========================================");
products.Sort(new ProductComparerByCost());
foreach (var product in products)
{
Console.WriteLine(product);
}
Console.WriteLine("=========================================");
Console.WriteLine("Products sorted by Units");
Console.WriteLine("=========================================");
products.Sort(new ProductComparerByUnits());
foreach (var product in products)
{
Console.WriteLine(product);
}
Console.WriteLine("=========================================");
Console.WriteLine("Products sorted by Cost [using Delegates]");
Console.WriteLine("=========================================");
//Using explicit methods
//products.Sort(Program.CompareProductByCost);
//Using Anonymous Methods
/*products.Sort(delegate (Product left, Product right)
* {
* if (left.Cost > right.Cost) return 1;
* if (left.Cost < right.Cost) return -1;
* return 0;
* });*/
//Lambda Expressions
//Step - 1
/*products.Sort((left, right) =>
* {
* if (left.Cost > right.Cost) return 1;
* if (left.Cost < right.Cost) return -1;
* return 0;
* });*/
//Step-2
/*products.Sort((left, right) =>
* {
* return Math.Sign(left.Cost - right.Cost);
* });*/
//Step-3
products.Sort((left, right) => Math.Sign(left.Cost - right.Cost));
foreach (var product in products)
{
Console.WriteLine(product);
}
Console.WriteLine("=========================================");
Console.WriteLine("Products sorted by Id [using Delegates]");
Console.WriteLine("=========================================");
products.Sort((left, right) => Math.Sign(left.Id - right.Id));
foreach (var product in products)
{
Console.WriteLine(product);
}
Console.WriteLine("=========================================");
Console.WriteLine("Costly Products - cost > 220");
Console.WriteLine("=========================================");
var costlyProductsCriteria = new CostlyProductSearchCriteria(220);
var costlyProducts = products.Search(costlyProductsCriteria);
foreach (var product in costlyProducts)
{
Console.WriteLine(product);
}
Console.WriteLine("=========================================");
Console.WriteLine("Cheap Products - cost <= 220");
Console.WriteLine("=========================================");
var cheapProductsCriteria = new InverseCriteria(costlyProductsCriteria);
var cheapProducts = products.Search(cheapProductsCriteria);
foreach (var product in cheapProducts)
{
Console.WriteLine(product);
}
Console.WriteLine("=========================================");
Console.WriteLine("Fast moving poducts - [Search using delegates where Units < 50]");
Console.WriteLine("================================================================");
var fastMovingProducts = products.Search(p => p.Units < 50);
foreach (var product in fastMovingProducts)
{
Console.WriteLine(product);
}
Console.WriteLine("=========================================");
Console.WriteLine("Mininum Units in Products");
Console.WriteLine("=========================================");
Console.WriteLine(products.Min(p => p.Units));
Console.WriteLine("Mininum Cost in Products");
Console.WriteLine("=========================================");
Console.WriteLine(products.Min(p => p.Cost));
Console.WriteLine("Number of products with Units > 50");
Console.WriteLine("=========================================");
Console.WriteLine(products.Count(p => p.Units > 50));
Console.ReadLine();
}
