C# 引用类型参数 ref

1、特点：传参会改变原值

2、格式：(ref int x, ref int y)

static void Main(string[] args)
{
    int a = 10;
    int b = 20;
    Add(ref a, ref b);
    Console.WriteLine("A：{0}", a);
    Console.WriteLine("B：{0}", b);

}


static void Add(ref int x, ref int y) 
{
    x++;
    y--;
    Console.WriteLine("X:{0}", x);
    Console.WriteLine("Y:{0}", y);
}