C#里的委托就是C里的函数指针,将函数名当实参传递, 还可以用 + , - 添加删除函数,将多个函数串起来顺序调用,称之为multicast,例子:
public delegate void print(int num); // 声明
public static void printNumber(int num)
{
Console.WriteLine("Number: {0, -12:N0}", num);
}
public static void printMoney(int num)
{
Console.WriteLine("Money: {0:c}", num);
}
public static void printHelper(print del, int num)
{
del(num);
}
static void Main(string[] args)
{
print printdel = printNumber;
printdel.Invoke(100);
printdel = printMoney;
printdel(100);
printHelper(printNumber, 123);
printHelper(printMoney, 123);
printdel = printMoney;
printdel += printNumber;
printdel += printNumber;
printdel(987);
printdel -= printNumber;
printdel(444);
Console.Read();
}
输出:
Number: 100
Money: ¥100.00
Number: 123
Money: ¥123.00
Money: ¥987.00
Number: 987
Number: 987
Money: ¥444.00
Number: 444
里面的格式控制还不清楚。
[1] www.tutorialspoint.com