Question

您好我正在尝试在c＃winforms中创建一个股票日志系统，我对如何将这些项目读回列表并将数据存储到属性中的想法感到有些困惑。

我将从csv文件中读取，其中每行为1项，每个属性用逗号分隔。

主要班级

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

任何帮助都会被重视

提前致谢！

Answer 1

您可以使用File.ReadAllLines来阅读文件

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
        });
    }
}

Answer 2

尝试拆分分隔符上的每一行（很可能是逗号），然后解析该行并将item的新实例添加到列表中。这样的东西应该在循环中工作（未经测试）：

var line = reader.ReadLine();
var values = line.Split(',');

itemlist.Add(new item { stallnumber = Convert.ToInt32(values[0]), ... });

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？

2 个答案: