C# ref实例讲解

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication8
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = 10;
            sumd(ref a);
            Console.WriteLine(a);
            Console.ReadKey();
        }

        static void sumd(ref int b)
        {
            b = b* b;
            
        }
    }
}