c# - 如何将文件中的项目读入项目列表并将属性设置为文件中的值？

Question

你好，我正在尝试在 c# winforms 中创建一个股票日志系统，我对如何将项目读回列表并将数据存储到属性中有点困惑。

我将从一个 csv 文件中读取，其中每一行都是 1 个项目，每个属性用逗号分隔。

主类

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
//using System.IO;
//using Microsoft.VisualBasic;

namespace stock_list
{
    public partial class Form1 : Form
    {

        private List<item> itemlist = new List<item>((1));

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            saveitem(Convert.ToInt64(txtStallNumber.Text), Convert.ToInt64(txtStockNumber.Text), txtDescription.Text, Convert.ToDecimal(txtPaidprice.Text), Convert.ToDecimal(txtSoldPrice.Text));
        }

        private void btnItems_Click(object sender, EventArgs e)
        {
            readfromfile();
        }

        private void readfromfile()
        {
            var reader = new System.IO.StreamReader(@"file.csv", Encoding.UTF8, false);
            while (!reader.EndOfStream)
            {
                //what todo here??
            }
        }

        private void saveitem(long stallnumberpar, long stocknumberpar, string itemdiscriptionpar, decimal boughtpricepar, decimal soldpricepar, decimal profitorlosspar = 0)
        {
            itemlist.Add(new item { stallnumber = stallnumberpar, stocknumber = stocknumberpar, itemdescription = itemdiscriptionpar, boughtprice = boughtpricepar, soldprice = soldpricepar, profitorloss = soldpricepar - boughtpricepar});
            txtDescription.Clear();
            txtPaidprice.Clear();
            txtSoldPrice.Clear();
            txtStallNumber.Text = "";
            txtStockNumber.Clear();
            txtStallNumber.Focus();
            MessageBox.Show("Item Saved");
        }

        private void btnQuery_Click(object sender, EventArgs e)
        {
            RunQueryDescription(Microsoft.VisualBasic.Interaction.InputBox("Enter Search Criteria", "Enter Search Criteria", "Default",0,0));
        }

        private void RunQueryDescription(string description)
        {
            //List<item> products = new List<item>((1));
            var writer = new System.IO.StreamWriter(@"file.csv", true, Encoding.UTF8);
            item[] productsarr = new item[itemlist.Count];
            int index = 0;
            foreach (item product in itemlist)
            {
                if (product.itemdescription.Contains(description))
                {
                    productsarr[index] = product;
                    index++;
                }
                else
                {
                    index++;
                    continue;
                }
            }
            for (int i = 0; i < productsarr.Length; i++)
            {
                MessageBox.Show(productsarr[i].stallnumber.ToString() + 
                    productsarr[i].stocknumber.ToString() + 
                    productsarr[i].itemdescription.ToString() + 
                    productsarr[i].boughtprice.ToString() + 
                    productsarr[i].soldprice.ToString() + 
                    productsarr[i].profitorloss.ToString());

                writer.Write(productsarr[i].stallnumber.ToString() + "," +
                    productsarr[i].stocknumber.ToString() + "," +
                    productsarr[i].itemdescription.ToString() + "," +
                    productsarr[i].boughtprice.ToString() + "," +
                    productsarr[i].soldprice.ToString() + "," +
                    productsarr[i].profitorloss.ToString());
                writer.Close();
                writer.Dispose();
            }

        }
    }
}

项目类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.IO;

    namespace stock_list
    {
        class item
        {
            public long stallnumber { get; set; }
            public long stocknumber { get; set; }
            public string itemdescription { get; set; }
            public decimal boughtprice { get; set; }
            public decimal soldprice { get; set; }
            public decimal profitorloss { get; set; }

        }
    }

编辑: 示例文件

1,1,Vase,1.00,2.00,1.00

任何帮助都将得到重视

提前致谢!

Answer 1

您可以使用File.ReadAllLines 来读取文件

private List<item> itemlist = new List<item>();
private void readfromfile()
{
    var lines = System.IO.File.ReadAllLines("path");

    foreach (string item in lines)
    {
        var values = item.Split(',');
        itemlist.Add(new item()
        {
            stallnumber = long.Parse(values[0]),
            stocknumber = long.Parse(values[1]),
            itemdescription = values[2],
            //and so on
        });
    }
}