private static void Demo02()
{
//HR.Employee e = new HR.Employee();
HR.PartTimeEmployee pt = new HR.PartTimeEmployee();
HR.ForentPEmployee ft = new HR.ForentPEmployee();
HR.Employee[] emps = { /* e, */ pt, ft };
}
private static void Demo03()
{
{
int x1 = 10;
long y = x1;
int x2 = (int)y;
}
{
HR.PartTimeEmployee pt1 = new HR.PartTimeEmployee();
HR.Employee e = pt1;
#region Non Type Safe Operation
// Below 2 success
{
// if fail throw error : System.InvalidCastException
HR.PartTimeEmployee pt2 = (HR.PartTimeEmployee)e;
Console.WriteLine(pt2);
}
{
// if fail return null
HR.PartTimeEmployee pt2 = e as HR.PartTimeEmployee;
Console.WriteLine(pt2);
}
// Below 2 fail on runtime
{
// if fail throw error : System.InvalidCastException
HR.PermanentEmployee pm = (HR.PermanentEmployee)e;
Console.WriteLine(pm);
}
{
// if fail return null
HR.PermanentEmployee pm = e as HR.PermanentEmployee;
Console.WriteLine(pm);
}
#endregion
#region Type Safe Operation
{
if (e is HR.PermanentEmployee)
{
HR.PermanentEmployee pm = (HR.PermanentEmployee)e;
Console.WriteLine(pm);
}
}
{
// if fail return null
HR.PermanentEmployee pm = e as HR.PermanentEmployee;
if (pm != null)
{
Console.WriteLine(pm);
}
}
#endregion
}
}
