static void Main(string[] args)
{
const int MAXBOOKS = 10;
Console.WriteLine($"Books to add in bookstore: {MAXBOOKS}\n");
//test delegate
BookStore l = new BookStore();
//add a book with a custom callback
l.AddBook("C# Delegate Sample", 25.99m, delegate(string message, decimal averagePrice) {
Console.WriteLine("Custom callback. Message: {0}, Average Price {1:C2}", message, averagePrice);
});
//add many books with a common callback
ProcessBookCountCallback commonCallback = new ProcessBookCountCallback(delegate(string message, decimal averagePrice) {
Console.WriteLine($"Common callback. Message: {message}, Average Price: {averagePrice.ToString("C2")}");
});
for (int i = 0; i < 10; i++)
{
decimal randomPrice = r.Next(0, 11) * 0.99m;
l.AddBook($"C# Delegate Sample {i}", randomPrice, commonCallback);
}
Console.ReadLine();
}
//add a book to list
//and call delegate with int argument representing total of books
public void AddBook(string name, decimal price, ProcessBookCountCallback processAveragePrice)
{
list.Add(new Book {
Name = name, Price = price
});
//sum price
total += price;
decimal average = total / list.Count;
processAveragePrice($"BookStore.Add(\"{name}\", {price})", average);
}
