如何使用 c# 訪問和搜索對象列表

Question

我正在創建一個通過 3 層架構從 .csv 文件讀取的應用程序。 我已經編寫了一個代碼，可以讀取 .csv 數據並將其存儲到數據鏈路層中的列表中。 但是我的業務邏輯有問題，或者我什至不知道從哪里開始。 下面是我的代碼

using System;    
using System.Collections.Generic;    
using System.IO;

namespace Data_Layer    
{    
    class dataConnection    
    {

        static void Main(string[] args)    
        {

        }

        public class CardsList    
        {    
            public string cardTypeCode { get; set; }    
            public string cardTypeName { get; set; }    
            public string issuingBank { get; set; }    
            public int cardNumber { get; set; }    
            public string cardHoldersName { get; set; }    
            public int cvvCvv2 { get; set; }    
            public DateTime issueDate { get; set; }    
            public DateTime expiryDate { get; set; }    
            public DateTime billingDate { get; set; }    
            public int cardPin { get; set; }    
            public int creditLimit { get; set; }    
        }

        class DataConnection    
        {    
            public List<CardsList> ReadDataFile()
            {    
                List<CardsList> cardRecords = new List<CardsList>();

                string[] path = File.ReadAllLines(@"C:\Users\tevin\Desktop\credit_card_records.csv");

                foreach (string CardsList in path)    
                {    
                    if ((CardsList != "") && !CardsList.EndsWith("Code"))   
                    {  
                        string[] columns = CardsList.Split(',');

                        CardsList holder = new CardsList();

                        holder.cardTypeCode = Convert.ToString(columns[0]);
                        holder.cardTypeName = Convert.ToString(columns[1]);
                        holder.issuingBank = Convert.ToString(columns[2]);
                        holder.cardNumber = Convert.ToInt32(columns[3]);
                        holder.cardHoldersName = Convert.ToString(columns[4]);

                        holder.cvvCvv2 = Convert.ToInt32(columns[5]);    
                        holder.issueDate = DateTime.ParseExact(columns[6], "M/yyyy-dd", null);

                        holder.expiryDate = DateTime.ParseExact(columns[7], "M/yyyy-dd", null);    
                        holder.billingDate = DateTime.ParseExact(columns[8], "M/yyyy-dd", null);
                        holder.cardPin = Convert.ToInt32(columns[9]);
                        holder.creditLimit = Convert.ToInt32(columns[10]);
                        cardRecords.Add(holder);
                    }
                    else { }
                }

                return cardRecords;
            }    
        }    
    }    
}

Answer 1

@johnwu 在我的公司中，我想按日期搜索過期的卡號，很容易被黑客入侵的密碼，即 1111/1234