从列表中打印出对象元素 [英] Print out object elements from list

问题描述

我正尝试在主作用域中使用 foreach 循环在列表中打印对象元素，但唯一打印出的内容是:

I'm trying to print object element in my list with foreach loop in main scope, but the only thing that prints out is :

ConsoleApplication1.WorldMap

ConsoleApplication1.WorldMap

这里出了什么问题?如何打印出实际的元素?

What have gone wrong here and how do I get it to print out the actual elements?

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);
        }
      }
   }
}

推荐答案

因为您没有覆盖 WorldMap 的 ToString 方法，所以 Console.WriteLine(视图)返回该类的名称，即 WorldMap .您可以覆盖类中的 ToString 方法，也可以在 foreach 循环中调用属性，但不要忘记，您应该将 object 更改为 var .像这样:

Because you didn't override the ToString method of WorldMap so Console.WriteLine(view) returns the name of the class which is WorldMap. You could either override the ToString method in the class or call the properties in the foreach loop but don't forget you should change object to var. Like this:

class WorldMap
{

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

或(将 object 更改为 var ):

Or (change object to var):

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

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