private void button1_Click(object sender, EventArgs e)
{
Order order = new Order() { CustomerName = "Test", OrderId = 98120 };
order.AddDetail("Item 1", 1, 120)
.AddDetail("Item 2", 2, 220)
.AddDetail("Item 3", 1, 110);
textBox1.Text = $"{order.GetOrderTotalAmount().ToString("c")}\r\n";
foreach (var detail in order.FindItem("Item 1"))
textBox1.Text += $"{detail.Item}: {detail.Quantity * detail.Price}\r\n";
foreach (var detail in order.Details)
textBox1.Text += $"{detail.Item}: {detail.Quantity * detail.Price}\r\n";
}
private void button2_Click(object sender, EventArgs e)
{
// new constructor
Order order = new Order() { CustomerName = "Test", OrderId = 98120 };
textBox1.Text = $"{order.ToString()}\r\n";
// new initializer
Dictionary<int, string> dict = new Dictionary<int, string>() {[1] = "John",[2] = "Test",[5] = "Number 5" };
Func<string> f = ()=> { string s=""; foreach (var v in dict) s += $"{v.Key} = {dict[v.Key]}\r\n"; return s; };
textBox1.Text += f.Invoke();
order.ChangeCustomerName("Changed Name");
textBox1.Text += $"{order.ToString()}\r\n";
order = null;
textBox1.Text += order?.CustomerName ?? "Null order or customer name";
}