private void button1_Click(object sender, EventArgs e)
{
//建立Calculator物件
Calculator calculator = new Calculator();
//建立委派物件並宣告指向哪一個函數(目標物件.目標方法名稱)
Calc calc = new Calc(calculator.add); //等同於 Calc calc = calculator.add;
double i = 1000;
double j = 200;
double k = 0;
//間接調用
k = calc.Invoke(i, j); //等同於 k = calc(i,j);
Console.WriteLine("間接調用 " + k);
//直接調用
Console.WriteLine("直接調用 " + calculator.add(i, j));
//建立委派物件指向沒有回傳值的方法
Calculator.Info info = new Calculator.Info(calculator.info);
// 間接調用
info.Invoke();//等同於 info();
//直接調用
calculator.info();
Console.WriteLine("---------------");
//並行多個方法(同步處理)
Calc calc2 = new Calc(calculator.add);
//使用 += 來加入一個新的委派方法
calc2 += new Calc(calculator.sub);
double t = calc2(10, 5);
//執行委派方法可以發現同時進行加法跟減法的方法
Console.WriteLine(t);
//使用 -= 來移除一個委派方法
calc2 -= new Calc(calculator.sub);
t = calc2(7, 5);
Console.WriteLine(t);
}
static void Main(string[] args)
{
Calculator calculator = new Calculator();
//無回傳值
Calculator.Info info = new Calculator.Info(calculator.information);
info.Invoke();
//簡寫等同
//Calculator.Info _info = calculator.information;
//_info();
//有回傳值,NET1.0
{
Calc calc = new Calc(calculator.加);
calc.Invoke(10, 2);
}
//簡寫等同
//Calc _calc = calculator.加;
//_calc(10, 2);
//有回傳值,NET2.0(匿名方法)
{//把整個方法放進Calc參數傳遞,拿掉修飾詞和回傳型別改成delegate
Calc calc = new Calc(delegate(int a, int b)
{
int sum;
sum = a + b;
Console.WriteLine("{0}+{1}={2}", a, b, sum);
return(sum);
});
calc.Invoke(10, 2);
}
//有回傳值,NET3.0(Lambda表達式)
{//拿掉delegate關鍵字加上=>表示,左邊是參數列表右邊是方法主體
//Lambda表達式本質是匿名方法也就是個方法
Calc calc = new Calc((int a, int b) =>
{
int sum;
sum = a + b;
Console.WriteLine("{0}+{1}={2}", a, b, sum);
return(sum);
});
calc.Invoke(10, 2);
}
//再更精簡
{//方法參數拿掉型別,透過糖果編譯器進行型別推斷
Calc calc = new Calc((a, b) =>
{
int sum;
sum = a + b;
Console.WriteLine("{0}+{1}={2}", a, b, sum);
return(sum);
});
calc.Invoke(10, 2);
}
//委派的泛型使用
{
//有回傳值
Calc <double> calc1 = calculator.加;
calc1(30.0, 5.0);
Calc <int> calc2 = calculator.加;
calc2(30, 5);
Calc <double, double, double> calc3 = calculator.加;
calc3(20.0, 3.0);
Calc <int, int, int> calc4 = calculator.加;
calc3(20.0, 3.0);
//沒有回傳值帶參數
Calculator.Info <string> info1 = calculator.information;
info1("卡西歐");
info1 = arg => Console.WriteLine(arg + "計算功能");
info1("雜牌");
}
//Action系統提供的沒有回傳參數的委派型別
{
Action act1 = new Action(calculator.information);
act1 = calculator.information;
act1 = delegate() { Console.WriteLine("計算功能"); };
act1 = () => { Console.WriteLine("計算功能"); };
act1 = () => Console.WriteLine("計算功能");
act1();
}
//Func系統提供的有回傳參數的泛型委派型別
//因為會回傳值所以一定會用泛型(至少要回傳型別)
{
Func <int, int, int> fun1 = new Func <int, int, int>(calculator.乘);
fun1 = calculator.乘;
fun1 = delegate(int a, int b)
{
int sum;
sum = a * b;
Console.WriteLine("{0}*{1}={2}", a, b, sum);
return(sum);
};
fun1 = (a, b) =>
{
int sum;
sum = a * b;
Console.WriteLine("{0}*{1}={2}", a, b, sum);
return(sum);
};
fun1(5, 5);
}
Console.ReadKey();
}
