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

namespace ConsoleApplication2
{

    class Program
    {
        //随机的将1-100之间的数据添加到 ArrayList数组中
        static void Main(string[] args)
        {

            ArrayList arrlist = new ArrayList();   //声明一个数组
            Random ran = new Random();    //定义一个伪随机数生成器
            
            while (true)   
            {
                //如果arrlist数组的元素超过100个的时候就输出arrlist的元素，然后终止程序(return)
                if (arrlist.Count >= 100)   
                {
                    arrlist.Sort();  //将arrlist数据按升序排序
                    foreach (int s in arrlist)
                    {
                       
                        Console.Write(s+" ");                                               
                    }
                    
                    Console.ReadKey();
                    return;
                }

                int random = ran.Next(1, 101);  //返回一个1-100之间的随机数
                if (!arrlist.Contains(random))
                {
                    arrlist.Add(random);
                }
                
            }

        }
    }
}

用分割线分割数组的元素

namespace ConsoleApplication2
{

    class Program
    {
       
        static void Main(string[] args)
        {
            //输出你|我|他 
            string[] arr = { "你", "我", "他" };
            string s = null;
            for (int i = 0; i < arr.Length; i++)
            {
                if (i == arr.Length - 1)
                {
                    s = s + arr[i];
                }
                else
                {
                    s = s + arr[i] + "|";
                }
            }
            Console.WriteLine(s);
            Console.ReadKey();
                        
        }
    }
}