public static void Main1()
{
//实例化委托
OrderDelegate orderDelegate = new OrderDelegate(Order.BuyFood);
//向委托中注册方法
orderDelegate += Order.BuyCake;
orderDelegate += Order.BuyFlower;
//还可以撤销.
//orderDelegate -= Order.BuyFlower;
//调用委托
orderDelegate();
//匿名委托
double length = double.Parse(Console.ReadLine());
double width = double.Parse(Console.ReadLine());
AreaDelegate ad = delegate {
Console.WriteLine("长方形的面积为：" + length * width);
};
ad(length, width);
}
private void btnArea_Click(object sender, EventArgs e)
{
AreaDelegate WoodArea = r => (r + 1) * (r + 1) * Math.PI;
AreaDelegate GoldArea = r => (r + 0.05) * (r + 0.05) * Math.PI;
Console.WriteLine(Area(5, WoodArea));
Console.WriteLine(Area(5, GoldArea));
}
static void Main(string[] args)
{
AreaDelegate ad1 = new AreaDelegate(RectangleArea);
ShapeArea.PrintShapeArea("사각형", 20, 30, ad1);
AreaDelegate ad2 = new AreaDelegate(TriangleArea);
ShapeArea.PrintShapeArea("삼각형", 20, 30, ad2);
}
static void Main(string[] args)
{
Console.WriteLine("请输入长方形的长：");
double length = double.Parse(Console.ReadLine());
Console.WriteLine("请输入长方形的宽：");
double width = double.Parse(Console.ReadLine());
AreaDelegate areaDelegate = delegate //匿名委托
{
Console.WriteLine("长方形的面积为：" + length * width);
};
areaDelegate(length, width);
MyDelegate myDelegate = new MyDelegate(SayHello); //命名方法委托
}
private void btnCircleArea_Click(object sender, EventArgs e)//lambda運算式
{
AreaDelegate CircleArea = r => r * r * Math.PI;
MessageBox.Show($"圓面積：{CircleArea(5)}");
MessageBox.Show($"圓面積：{AreaCircle(10)}");
MessageBox.Show($"圓面積：{CustomCircleArea(5, r => r * r * Math.PI)}");
MessageBox.Show($"圓面積：{CustomCircleArea(5, r => (r-0.1) * (r-0.1) * Math.PI)}");
//AreaDelegate SqyareArea = s => s * s;
//MessageBox.Show($"正方形面積：{SqyareArea(5)}");
//AreaDelegate2 RectangleArea = (w, l) => w * l;
//MessageBox.Show($"正方形面積：{RectangleArea(5,10)}");
}
static void Main(string[] args)
{
//Step-2: Instantiating the delegate
AreaDelegate area = new AreaDelegate(Rectangle.CalculateArea);
// OR
//Step-3: Binding method to delegate instance
AreaDelegate area1 = Rectangle.CalculateArea;
// Step-3: Invoking the Delegate by using invoke method
Console.WriteLine("Using invoke method");
Console.WriteLine("Area of Rectangle is {0}", area.Invoke(10.10, 20.10));
// OR
Console.WriteLine("-------------------------------------------------");
// Step-3: Invoking the Delegate without using the invoke method
Console.WriteLine("Without using invoke method");
Console.WriteLine("Area of Rectangle is {0} ", area1(10.10, 20.10));
Console.ReadLine();
}
public void PrintShapeArea(string name, double a, double b, AreaDelegate areaDelegate)
{
Console.WriteLine($"{name} 도형의 넓이 : {areaDelegate(a, b)}");
}
double CustomCircleArea(double r, AreaDelegate ad)//呼叫方法
{
return(ad(r));
}
public void PrintShapeArea <T>(string name, T a, T b, AreaDelegate <T> areaDelegate)
{
Console.WriteLine($"{name} 도형의 넓이 : {areaDelegate(a, b)}");
}
static void Main(string[] args)
{
#if false
xj obj = new xj();
obj.Age = 36;
obj.Height = 158;
obj.Nation = "Japan";
Console.WriteLine("Age={0},Height={1}", obj.Age, obj.Height);
#endif
#if false
int[,] m_array = new int[2, 3];
for (int i = 0; i < m_array.Length; i++)
{
m_array[i / 3, i % 3] = i;
}
for (int i = 0; i < m_array.Length; i++)
{
Console.WriteLine("{0}, ", m_array[i / 3, i % 3]);
}
#endif
#if false
int[] num = { 2, 4, 8 };
foreach (int x in num)
{
Console.WriteLine(x);
}
#endif
#if false
Shapes shp = new Shapes();
shp.Add(5);
shp.Add(4);
shp.Add(3);
shp.Add(2);
shp.Add(1);
Console.WriteLine(shp[2]);
#endif
#if false
// 装箱和拆箱实验
//在 C# 语言中数据类型分为值类型和引用类型，将值类型转换为引用类型的操作称为装箱，相应地将引用类型转换成值类型称为拆箱。
int a = 101;
string str = a.ToString(); //装箱
float b = float.Parse(str); //拆箱
Console.WriteLine("a={0}, b={1}", a, b);
int val = 100;
object obj = val;//装箱
Console.WriteLine("对象的值 = {0}", obj);
int num = (int)obj;//拆箱
Console.WriteLine("num: {0}", num);
#endif
#if false
// 第1种委托：命名方法委托
Mydel del_a = new Mydel(Shapes.showXj); // 委托实例化, 代理类的静态方法
del_a(); // 调用委托实例
Mydel del_b = new Mydel(new Shapes().showJs); // 委托实例化，代理一个对象的方法
del_b();
#endif
#if false
BookDelegate bookDelegate = new BookDelegate(Book.BookSort);
Book[] books = new Book[3];
books[0] = new Book("计算机应用", 50);
books[1] = new Book("C# 教程", 59);
books[2] = new Book("VS2015应用", 49);
bookDelegate(books);
foreach (Book bk in books)
{
Console.WriteLine(bk);
}
#endif
#if false
// 第2种委托：多播委托。
// 即调用委托实例时，可同时调用所代理的多个方法。可以向委托实例添加、删除方法
DelegateLearn delObj = new DelegateLearn();
while (true)
{
Console.WriteLine("A - add, R - remove, Q - quit:");
switch (Console.ReadKey().Key)
{
case ConsoleKey.A:
delObj.AddFlower();
break;
case ConsoleKey.R:
delObj.RemoveFlower();
break;
case ConsoleKey.Q:
return;
default:
delObj.showOrder();
break;
}
}
#endif
#if true
// 第3种委托：匿名委托。就是实例化委托时，直接给出代码块，而不必定义方法
// 匿名委托不是为了代码重用，一般用于实现一些仅需要使用一次委托中代码的情况，并且代码比较少
AreaDelegate areaDlg = delegate(double length, double width){
Console.WriteLine("Rectangle Area: " + length * width);
};
areaDlg(3, 6);
#endif
}
double Area(double r, AreaDelegate ad)
{
return(ad(r));
}
private void circleButton_Click(object sender, RoutedEventArgs e)
{
areaMethod = CircleArea;
input = CrRadius;
}
private void triangleButton_Click(object sender, RoutedEventArgs e)
{
areaMethod = TriangleArea;
input = TriBase;
}
private void squareButton_Click(object sender, RoutedEventArgs e)
{
areaMethod = SquareArea;
input = SqBase;
}
private void btnCircle_Click(object sender, EventArgs e)
{
AreaDelegate circleArea = r => r * r * 3.14;
MessageBox.Show(string.Format("圓形面積為:{0}", circleArea(5)));
}