C#函数 161013

来源：互联网发布：java map中文乱码编辑：程序博客网时间：2024/06/04 19:41

<visibility> <return type> <name>(<parameters>)
{
<function code>
}

visibility是可选的，默认是private

return type是返回值类型，可以是void

栗子：

publicvoid DoStuff()

{ Console.WriteLine("I'm doing something...");}

publicint AddNumbers(int number1,int number2)

{ int result= number1+ number2;

if(result>10)

{ return result; }

}

输出还是20，因为传进去的是个copy，主函数里面的值不会改变！！！

namespace value_ref
{
    class Program
    {
        static void AddFive(int number)
        {
            number = number + 5;
        }

        static void Main(string[] args)
        {
            int number = 20;
            AddFive(number);
            Console.WriteLine(number);
            Console.ReadKey();

}
}
}

输出25 加入ref关键字

namespace value_ref
{
    class Program
    {
        static void AddFive(ref int number)
        {
            number = number + 5;
        }

        static void Main(string[] args)
        {
            int number = 20;
            AddFive(ref number);
            Console.WriteLine(number);
            Console.ReadKey();

}
}
}

===============params===============================

   static void Main(string[] args)
        {
            GreetPersons(0);
            GreetPersons(25, "John", "Jane", "Tarzan");
            Console.ReadKey();
        }

        static void GreetPersons(int someUnusedParameter, params string[] names)
        {
            foreach (string name in names)
                Console.WriteLine("Hello, " + name);
        }

0 0