C#_List的使用_List重複添加值的錯誤避免修正

List的使用

程式碼

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

namespace Lists_and_Generics
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("=========int List===========");
            List<int> iList = new List<int>();
            iList.Add(2);//0
            iList.Add(3);//1
            iList.Add(5);//2
            iList.Add(7);//3

            iList.Insert(2, 865);

            foreach (int num in iList)
            {
                Console.WriteLine(num);
            }

            Console.WriteLine("=========string List===========");
            //----------------------------------------
            List<string> colors = new List<string>();
            colors.Add("Red");
            colors.Add("Blue");
            colors.Add("Green");
            foreach (string color in colors)
            {
                Console.WriteLine(color);
            }

            Console.WriteLine("=========double List===========");
            List<double> douArray = new List<double>();
            douArray.Add(0.2);
            douArray.Add(0.4);
            douArray.Add(0.6);
            foreach(double douNum in douArray)
            {
                Console.WriteLine(douNum);
            }


            Console.ReadKey();
        }
    }
}

List重複添加值的錯誤避免修正

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

namespace Lists_and_Generics
{
    class Program
    {
        static void Main(string[] args)
        {
            //new一個用List接的Model
            List<myClass> ModelInfoList = new List<myClass>();

            //會覆蓋的主因
            //myClass isModelInfo = new myClass();
            decimal addA = 1, addB = 2, addC = 3;

            for(int i=0;i<3;i++)
            {
                ////加在此，每次迴圈跑時，重新new一次，如此不會讓ModelInfoList 的資料被覆蓋
                myClass isModelInfo = new myClass();
                addA++;
                addB++;
                addC++;


                //每次迴圈Model的每個欄位都增加新的資訊
                isModelInfo.FieldA = addA;
                isModelInfo.FieldB = addB;
                isModelInfo.FieldC = addC;

                //將每次迴圈紀錄的欄位Model，add到List接的Model
                ModelInfoList.Add(isModelInfo);
            }
            Console.ReadKey();
        }
    }
}

參考:

為什麼List 在add數次，總會被最後add的項目給覆蓋呢？
http://ww0o0ww.pixnet.net/blog/post/63051673-%E3%80%90c%23%E3%80%91%E3%80%8Alist-%3Ct%3E%E3%80%8Blist-add-%E8%A6%86%E8%93%8B%E5%8E%9F%E4%BE%86%E7%9A%84%E8%B3%87%E6%96%99

http://csharp.net-informations.com/collection/list.htm
https://www.youtube.com/watch?v=Kx8ij3WZpSg
http://stackoverflow.com/questions/14433332/avoid-adding-duplicate-elements-to-a-list-c-sharp
http://stackoverflow.com/questions/347675/list-add-seems-to-be-duplicating-entries-whats-wrong