static void Main(string[] args)
{
DelegateEx DEx = new DelegateEx(MethodA);
DEx();
DEx = MethodB;
DEx();
DEx = new DelegateEx(MethodC);
DEx();
Console.WriteLine("\n-----Group-----\n");
DelegateEx MA = MethodA;
DelegateEx MB = MethodB;
DelegateEx MC = MethodC;
DEx = MA;
DEx = DEx + MC;
DEx += MB; // MethodA->MethodC->MethodB
DEx();
Console.WriteLine();
DEx -= MB; // MethodA->MethodC
DEx(); // MethodC
Console.WriteLine();
DEx += MA; // MethodA->MethodC->MethodA
DEx(); // MethodA
Console.WriteLine();
DEx -= MA; // MethodA->MethodC
DEx(); // MethodC
Console.WriteLine();
DEx -= MA; // MethodC
DEx();
Console.WriteLine();
DEx -= MC; // DEx => Empty
}
static void Main(string[] args)
{
// delegate is a type safe function pointer
DelegateEx del = new DelegateEx(Hello);
del("Greeting from Hello function");
/*
* // abstract class
* FulltimeEmployee fte = new FulltimeEmployee()
* {
* ID = 209,
* FirstName = "John",
* LastName = "Doe",
* AnnualSalary = 87000
* };
*
* Console.WriteLine(fte.GetFullName());
* Console.WriteLine(fte.GetMonthlySalary());
* Console.WriteLine("-----------------------");
*
* ContractEmployee cte = new ContractEmployee()
* {
* ID = 213,
* FirstName = "Jane",
* LastName = "Doe",
* HourlyPay = 35,
* TotalHours = 170
* };
*
* Console.WriteLine(cte.GetFullName());
* Console.WriteLine(cte.GetMonthlySalary());
*/
/*
* // 2. jagged array is an array of arrays
* string[][] jaggedArr = new string[3][];
* jaggedArr[0] = new string[3];
* jaggedArr[1] = new string[1];
* jaggedArr[2] = new string[2];
*
* jaggedArr[0][0] = "Bachelor";
* jaggedArr[0][1] = "Master";
* jaggedArr[0][2] = "PhD";
*
* jaggedArr[1][0] = "Bachelor";
*
* jaggedArr[2][0] = "Bachelor";
* jaggedArr[2][1] = "Master";
*
* foreach (var item in jaggedArr)
* {
* foreach (var innerItem in item)
* {
* Console.WriteLine(innerItem);
* }
* Console.WriteLine();
* }
*/
/*
* // 1. store different type in array in C#? Yes with object array or ArrayList
*
* //object[] arr = new object[3];
* //arr[0] = 34.76;
* //arr[1] = "Montreal";
* //arr[2] = new Customer { Id = 109, Name = "Phillip" };
*
* ArrayList arr = new ArrayList();
* arr.Add(234.88);
* arr.Add("Toronto");
* arr.Add(new Customer { Id = 1009, Name = "Valerie" });
*
* foreach (var item in arr)
* {
* Console.WriteLine(item);
* }
*/
}
