using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 namespace ConsoleApplication7

 {

     class Program

     {

         static void Main(string[] args)

         {

             int number = ;

             Test(number);

             Console.WriteLine(number);//输出结果还是10，方法并没有改变number的值

             Console.ReadKey();

         }

         static int Test(int a)

         {

             a = ;

         }

     }

 }

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 namespace ConsoleApplication7

 {

     class Program

     {

         static void Main(string[] args)

         {

             int number = ;

             Test(ref number);

             Console.WriteLine(number);//输出结果是100，方法改变了number的值

             Console.ReadKey();

         }

         static int Test(ref int a)

         {

             a = ;

         }

     }

 }