从列表中打印出对象元素

Question

我试图在主范围内使用 foreach 循环打印列表中的对象元素，但唯一打印出来的是：

ConsoleApplication1.WorldMap

这里出了什么问题，我如何让它打印出实际元素？

using ConsoleApplication1;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
     class WorldMap
     {

        private string higher;
        private string lower;

        public worldMap()
        {
        }

        public WorldMap(string higher, string lower)
        {
           this.higher = higher;
           this.lower = lower;
        } 

        public string Higher
        {
            get { return higher; }
            set { higher = value; }
        }

        public string Lower
        {
            get { return Lower; }
            set { Lower = value; }
        }
    }   
  class Program
  {

    static void Main(string[] args)
    {

        WorldMap map = new WorldMap();

        List<WorldMap> mapList = new List<WorldMap>();
        mapList.Add(new WorldMap(map.Lower, map.Higher));

        Console.WriteLine("\tInsert highest point:");
        map.Highest= Console.ReadLine();
        Console.WriteLine("\tInsert lowest point");
        map.Lowest= Console.ReadLine();


        using (StreamWriter writer = new StreamWriter(@"C:\freq.txt", true))
        { 
            writer.WriteLine(map.Lower + map.Higher); 
        }

        foreach (object view in mapList)
        {
            Console.WriteLine(view);
        }
      }
   }
}

Answer 1

视图是 WorldMap 类型，请改用它：

foreach (object view in mapList)
        {
            Console.WriteLine(view.Lower.ToString() + "," + view.Higher.ToString() );
        }

Answer 2

因为您没有覆盖 WorldMap 的 ToString 方法，所以 Console.WriteLine(view) returns class 的名称是 WorldMap.您可以覆盖 class 中的 ToString 方法或调用 foreach 循环中的属性，但不要忘记您应该将 object 更改为 var。像这样：

class WorldMap
{

   ....
   ....
   public override string ToString()
   {
      return Lower + " " + Higher;
   }
}

或（将object更改为var）：

foreach (var view in mapList)
{
     Console.WriteLine(view.Lower + " " + view.Higher);
}

从列表中打印出对象元素

Print out object elements from list

c#

console-application