我如何使用c＃访问和搜索对象列表

Question

我正在创建一个通过三层体系结构从.csv文件读取的应用程序。我已经编写了一个代码，可以读取.csv数据并将其存储到数据链接层的列表中。但我在业务逻辑中遇到问题，或者我什至不知道从哪里开始。下面是我的代码

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

读取.csv文件时，请确保代码正确。

我修改了您的代码，可以尝试。

using System;
using System.Collections.Generic;
using System.IO;
namespace Data_Layer
{
    class dataConnection
    {
       static void Main(string[] args)
       {
          DataConnection test = new DataConnection();
          test.ReadDataFile();
       }
    /// <summary>
    /// Model
    /// </summary>
    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;
        }
    }
}

}