WriteLine(ls.ToString())；Console.WriteLine(ls);输出结果相同，为什么要加 .ToString()

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 namespace Test05
 7 {
 8     class Program
 9     {
10         static void Main(string[] args)
11         {
12             int shj1 = 45;                                    //声明整型变量shj1，并赋值为45
13             int shj2 = 5;                                        //声明整型变量shj2，并赋值为5
14             int ls;                                            //声明整型变量ls
15             ls = shj1 / shj2;                                    //使ls的值为shj1除以shj2得到的值
16             Console.WriteLine(ls.ToString());
17            // Console.WriteLine(ls);
18             Console.Read();
19 
20         }
21     }
22 }