//handler bottone uguale
private void btn_ug_Click(object sender, EventArgs e)
{
int n, d, op;
n = Convert.ToInt32(text_n1.Text);
d = Convert.ToInt32(text_d1.Text);
f1 = new Frazione(n, d);
n = Convert.ToInt32(text_n2.Text);
d = Convert.ToInt32(text_d2.Text);
f2 = new Frazione(n, d);
op = cb_op.SelectedIndex;
switch (op)
{
case 0: //+
f3 = f1 + f2;
break;
case 1: //-
f3 = f1 - f2;
break;
case 2: //x
f3 = f1 * f2;
break;
case 3: //:
f3 = f1 / f2;
break;
}
text_nris.Text = f3.n.ToString();
text_dris.Text = f3.d.ToString();
}
static void Main(string[] args)
{
using DisposableClass dispClass = new();
Console.WriteLine("=== Week 2 - Day 3 ===");
#region Delegate
BinaryOperation somma = Add;
int result = somma(3, 2); // = Add(3, 2)
somma = Subtract;
// somma = Reverse; // ERRORE !!!
result = somma(3, 2); // = Subtract(3, 2)
PrintResult(somma, 3, 2);
PrintResult(Add, 3, 2); // Add รจ una BinaryOperation
Func <int, int, int> add = Add;
List <Person> people = new List <Person>();
WhereFunction funct = WhereName;
//people.Where(funct); // al momento no :(
Func <Person, bool> whereClause = WhereName;
//static bool WhereName(Person p)
//{
// return p.FirstName == "Roberto";
//}
// EQUIVALE A
whereClause = p =>
{
return(p.FirstNameProp == "Roberto");
};
// EQUIVALE A
whereClause = p => p.FirstNameProp == "Roberto"; // In-Line funct, Arrow funct, lambda expression
IEnumerable <Person> selectedPeople = people.Where(whereClause); // LINQ
#endregion
#region Nullable Types
int i = 9;
int?i2 = null;
int i2Value = i2.HasValue ? i2.Value : 99;
i2Value = i2.GetValueOrDefault(99);
Person p1 = new Person
{
FirstNameProp = "Mario",
LastNameProp = "Rossi"
};
if (p1.Father != null)
{
string first = p1.Father.FirstNameProp != "" ? p1.Father.FirstNameProp : "Orfano";
Console.WriteLine("{0}", first);
}
else
{
Console.WriteLine("Orfano");
}
Console.WriteLine("{0}", p1.Father?.Father?.FirstNameProp ?? "Niente Nonno");
return;
#endregion
#region Casting
Frazione es5f1 = new(3, 2);
Frazione es5f2 = new(1, 6);
Console.WriteLine("es5f1 > es5f2 : {0}", (es5f1.CompareTo(es5f2) == 1));
// EQUIVALE A ...
Console.WriteLine("es5f1 > es5f2 : {0}", (es5f1 > es5f2));
ComplexNumber es51 = new(3, 4);
ComplexNumber es52 = new(3, 4);
Console.WriteLine("es51 == es52 (ref): {0}", object.ReferenceEquals(es51, es52));
Console.WriteLine("es51 == es52 (1): {0}", (es51 == es52));
es52 = new(1, 4);
Console.WriteLine("es51 == es52 (2): {0}", (es51 == es52));
double dbl51 = (double)es51;
Console.WriteLine("Casting Complex to double {0}", dbl51);
ComplexNumber es53 = 5;
Console.WriteLine("Casting double to Complex ({0}, {1})", es53.Real, es53.Immag);
return;
Currency c1 = new(10, "EUR");
Currency c2 = new(10, "USD");
decimal d1 = (decimal)c1 + (decimal)c2;
Currency.DefaultCurrency = "USD";
Currency c3 = d1;
Frazione f = new(3, 2);
Frazione f99 = new(3, 2);
//f.Equals(f99);
//f == f99;
Console.WriteLine("f == f1: {0}", (f == f99));
double d = f;
int value = (int)f;
Console.WriteLine("Casting Frazione to double {0}", d);
Console.WriteLine("Casting Frazione to int {0}", value);
return;
#endregion
#region Esercitazione 4
ComplexNumber cpx1 = new("(1,2)");
Console.WriteLine($"CPX2: {cpx1.Real}, {cpx1.Immag}");
ComplexNumber cpx2 = new(3, -5);
Console.WriteLine($"CPX2: {cpx2.Real}, {cpx2.Immag}");
var cpx3 = -cpx2;
Console.WriteLine($"CPX3: {cpx3.Real}, {cpx3.Immag}");
var cpx4 = cpx1 + cpx2;
Console.WriteLine($"CPX4: {cpx4.Real}, {cpx4.Immag}");
return;
#endregion
#region Op Overloading
Frazione f1 = new(2, 3);
Frazione f2 = new(5, 9);
Frazione f3 = f1.Somma(f2);
// ovvero ...
f3 = -f1;
f3 = f1 + f2;
if (f3)
{
}
// a = b - c => operatore binario
// a = -b => operatore unario
// a++
#endregion
#region Interfacce
DataService dataSvc = new();
dataSvc.NotInInterface();
InMemoryDataService mDataSvc = new();
MainBusinessLayer bl = new(mDataSvc);
#endregion
#region Esercitazione 3
Product prod1 = new();
Product prod2 = new("PRD001", 100);
Product prod3 = new("PRD002", "SSD 500Gb", 34.8M);
if (prod2.DiscountedPrice(20, out decimal discountedPrice))
{
Console.WriteLine($"Discounted prod2 (20%): {discountedPrice}");
}
else
{
Console.WriteLine($"Discount rate out of valid range.");
}
Console.WriteLine(prod3.ProductAge());
if (prod3.SaveProduct(@"C:\Temp"))
{
Console.WriteLine("Salvato!");
}
else
{
Console.WriteLine("Errore!");
}
return;
#endregion
#region Ctors
Person p = new("Mario", "Rossi");
Person p2 = new("Paolo");
Person p3 = new();
#endregion
#region Nested types
HelpDeskTicket ticket = new HelpDeskTicket
{
Id = 1,
State = HelpDeskTicket.HelpDeskTicketState.New,
Owner = new HelpDeskTicket.TicketOwner()
};
HelpDeskTicket.TicketOwner owner = new();
HelpDeskTicket t1 = new HelpDeskTicket
{
Id = 1,
State = HelpDeskTicket.HelpDeskTicketState.New,
Owner = owner
};
#endregion
} // Dispose() ...
