C#中值传递问题

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/YangZuo_Chester/article/details/76223262

1.传递后创建新区域，对原值不做任何改变

using System;
namespace CsTest
{
    class Program
    { 
        public void Swap(int num1,int num2)
        {
            int temp;
            temp = num1;
            num1 =num2;
            num2 = temp;
        }
        static void Main(string[] args)
        {
            int num1;
            int num2;
            Program Swap= new Program();

            Console.WriteLine("输入NUM1:");
                num1 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("输入NUM2:");
                num2 = Convert.ToInt32(Console.ReadLine());

            Swap.Swap(num1,num2);
            Console.WriteLine("NUM1="+num1+"\nNUM2="+num2);
        }
    }
}

2.使用ref，不开辟新内存，改变原值

using System;
namespace CsTest
{
    class Program
    { 
        public void Swap(ref int num1,ref int num2)

        {
            int temp;
            temp = num1;
            num1 =num2;
            num2 = temp;
        }
        static void Main(string[] args)
        {
            int num1;
            int num2;
            Program Swap= new Program();

            Console.WriteLine("输入NUM1:");
                num1 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("输入NUM2:");
                num2 = Convert.ToInt32(Console.ReadLine());

            Swap.Swap(ref num1,ref num2);
            Console.WriteLine("NUM1="+num1+"\nNUM2="+num2);
        }
    }
}

3.输出参数（可返回多个参数值）

using System;
namespace CsTest
{
    class Program
    { 
        public void getValue(out int num1,out int num2)
        {
            Console.WriteLine("输入NUM1:");
                num1 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("输入NUM2:");
                num2 = Convert.ToInt32(Console.ReadLine());
        }
        static void Main(string[] args)
        {
            int num1;
            int num2;
            Program Swap= new Program();

            Swap.getValue(out  num1,out num2);
            Console.WriteLine("NUM1="+num1+"\nNUM2="+num2);
        }
    }
}