public override void Show(Graphics g)
{
ShowShape.DrawSelf(g, GetPenByWin(this));
if (SubWinList != null)
{
foreach (var item in SubWinList)
{
item.Show(g);
}
}
// ShowShape.Show();
//throw new NotImplementedException();
}
public static void Main()
{
var gracePeriod = new TimeSpan(1, 0, 0);
var date = DateTime.Now;
var date1 = date.AddDays(-1);
var date2 = date1 + TimeSpan.Parse("17:00");
var date3 = date2 - gracePeriod;
var aList = new ArrayList();
//Example of Boxing
for (var i = 1; i <= 10; i++)
{
aList.Add(i);
}
for (var i = 0; i < aList.Count; i++)
{
// Unboxing....
var iV = (int)aList[i];
WriteLine($"This is a list {i}={iV}");
}
//Better loop but also unboxing in i2
foreach (var i2 in aList)
{
WriteLine($"{i2}");
}
//Better Use of Generics
var bList = new List <int>();
for (var i = 1; i <= 10; i++)
{
bList.Add(i);
WriteLine($"Added {bList[i-1],-2:D} to bList position {i-1}");
}
//Generic LinkedList <T>
var llList2 = new LinkedList <int>();
llList2.AddLast(1);
llList2.AddFirst(100);
llList2.AddLast(10);
foreach (var llint in llList2)
{
WriteLine($"{llint, -4} Item.");
}
var p1 = new Person();
var p2 = new Person();
p1.Name = "Dave";
p2.Name = p1.Name;
if (p1.CompareTo(p2) == 0)
{
p2.Name = "Chrissie";
}
/*
* Covariance with classes
*/
var s1 = new Shape
{
Width = 101.45,
Height = 25.25
};
WriteLine(s1.ToString());
var q1 = new Square(s1.Width);
WriteLine(q1.ToString());
Shape s2 = s1.CreateSquare(s1.Width);
WriteLine(s2.ToString());
var ans = GiveIt("Do It ");
WriteLine(ans);
/*
* Covariance with Generic Interfaces
*/
IIndex <Square> squares = SquareCollection.GetReSquares();
IIndex <Shape> shapes = squares;
for (int i = 0; i < shapes.Count; i++)
{
WriteLine(shapes[i]);
}
var nShapeDisplay = new ShowShape();
nShapeDisplay.Show(s1);
IDisplay <Shape> nSqIDisplay = new ShowShape();
var nBox = new Square(1.111);
nSqIDisplay.Show(nBox);
IDisplay <Shape> iDisplayShape = new ShowShape();
IDisplay <Square> iDisplaySq = iDisplayShape;
iDisplaySq.Show(q1);
// Generic Struct
Nullable <int> n;
n = 1;
if (n.HasValue)
{
WriteLine($"This is good. {n}");
}
int?n1 = 0;
n1 = null;
var msg = "";
msg = (n1 == null ? $"n1 is null" : $"n1 is not null!");
ReadKey();
}