如何过滤.CSV文件C＃的读取行

Question

我有一个结构化的文件。 在您编写的应用程序中有两个加载两个文件，并比较两个文件中相同的前两个元素。 如果相同加载第一个元素和第二个元素combobox1和combobox2。 在第二个组合框中，当您选择相应的年份时，应该读取第四个元素选定年份？ 从每行的第四个元素到最后一个元素是从1月到12月的月份，每行的第三个元素是从1到31的月份的日期。 如何从组合框中读取所选年份的每个月的数据？

18050,1976,1,0.390,0.660,0.290,0.740,9.160,1.400,0.670,3.120,0.460,0.420,0.360,0.400,
18050,1976,2,0.390,0.520,0.290,0.740,7.540,1.270,0.670,2.660,0.460,0.420,0.360,0.380,
18050,1976,3,0.390,0.450,0.240,0.660,5.260,1.270,0.670,2.510,0.460,0.420,0.410,0.400,
18050,1976,4,0.390,0.450,0.240,0.660,4.400,1.180,0.620,2.360,0.460,0.410,0.400,0.440,
18050,1976,5,0.390,0.450,0.290,0.660,4.220,1.080,0.620,2.360,0.460,0.410,0.400,4.750,
18050,1976,6,0.520,0.390,0.240,0.580,4.040,1.270,0.620,4.200,0.460,0.410,0.380,2.810,
18050,1976,7,0.390,0.390,0.240,0.520,3.680,37.800,0.620,5.870,0.460,0.400,0.360,1.620,
18050,1976,8,0.390,0.390,0.200,0.580,3.330,22.900,0.580,4.570,0.460,0.380,0.360,0.980,
18050,1976,9,0.390,0.390,0.200,0.660,2.830,11.200,0.580,4.020,0.460,0.360,0.360,0.740,
18050,1976,10,0.390,0.340,0.200,1.380,2.650,8.120,0.580,3.660,0.440,0.360,0.360,0.520,
18050,1976,11,0.340,0.390,0.200,2.260,2.350,5.870,0.580,3.270,0.440,0.360,0.360,0.460,
18050,1976,12,0.340,0.450,0.200,1.700,2.350,4.750,0.580,4.570,0.440,0.360,0.360,0.460,
18050,1976,13,0.340,0.390,0.200,1.590,2.350,3.840,0.540,4.020,0.440,0.340,0.360,0.440,
18050,1976,14,0.340,0.390,0.290,2.120,2.200,3.120,0.540,3.660,0.420,0.340,0.340,0.520,
18050,1976,15,0.290,0.390,0.290,2.400,2.050,2.970,0.540,3.270,0.420,0.400,0.340,0.520,
18050,1976,16,0.290,0.390,0.240,1.590,1.770,2.810,0.540,2.970,0.420,0.360,0.340,0.440,
18050,1976,17,0.290,0.340,0.290,1.170,1.520,2.660,0.540,2.660,0.410,0.360,0.330,0.420,
18050,1976,18,0.290,0.340,0.290,1.170,1.270,2.360,0.540,2.210,0.410,0.410,0.340,0.420,
18050,1976,19,0.240,0.340,0.390,1.170,1.080,2.210,0.540,2.060,0.410,0.410,0.400,0.410,
18050,1976,20,0.290,0.340,0.390,1.010,1.080,2.060,0.520,1.760,0.400,0.400,1.340,0.400,
18050,1976,21,0.290,0.290,0.390,0.920,1.270,1.760,0.520,1.200,0.740,0.400,2.660,0.400,
18050,1976,22,0.340,0.290,0.450,0.820,2.860,1.480,0.520,1.080,0.580,0.380,1.760,0.400,
18050,1976,23,0.340,0.290,0.520,0.740,3.050,1.200,0.520,0.980,0.580,0.380,0.980,0.400,
18050,1976,24,0.340,0.290,0.520,0.660,4.000,0.980,0.540,0.810,0.540,0.380,0.520,0.380,
18050,1976,25,0.340,0.290,0.920,0.740,2.680,0.890,2.810,0.670,0.520,0.360,0.460,0.380,
18050,1976,26,0.390,0.290,1.380,1.380,2.060,0.810,2.510,0.580,0.520,0.360,0.440,0.380,
18050,1976,27,0.740,0.290,1.490,2.570,1.770,0.810,2.510,0.580,0.490,0.360,0.420,0.380,
18050,1976,28,1.280,0.290,1.380,2.730,1.770,0.740,4.750,0.520,0.460,0.360,0.410,0.360,
18050,1976,29,1.010,0.290,1.090,3.610,1.650,0.740,5.480,0.520,0.420,0.360,0.410,0.360,
18050,1976,30,0.820,,0.820,4.000,1.520,0.670,4.210,0.490,0.420,0.360,0.400,0.360,
18050,1976,31,0.660,,0.740,,1.520,,3.660,0.460,,0.360,,0.440,

我的代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            label3.Hide();
            label4.Hide();
        }

        string pathFolder;
        string pathFolder2;

        string resultStation;
        string resultStation2;

        List<string> resultYears = new List<string>();
        List<string> resultYears2 = new List<string>();

        private void button1_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog dialog = new OpenFileDialog())
            {
                if (dialog.ShowDialog(this) == DialogResult.OK)
                {
                    string sFileName = dialog.FileName;
                    pathFolder = sFileName;

                    label3.Text = pathFolder;
                    label3.Show();                 

                    string[] lines = System.IO.File.ReadAllLines(dialog.FileName);

                    int i = 0;

                    foreach (var line in lines)
                    {
                        var splittedValues = line.Split(',');

                        var firstWord = splittedValues[0];
                        var firstYear = splittedValues[1];
                      // var JanuaryFirst = splittedValues[3];

                      // var lastJanuary = File.ReadLines(pathFolder).Last();
                      // var JanuaryLast = lastJanuary[3];

                        if (!resultYears.Contains(firstYear))
                        {
                            resultYears.Add(firstYear);
                        }


                        if (i == 0)
                        {
                            resultStation = firstWord;
                        }
                        else
                        {
                            if (resultStation != firstWord)
                            {
                                MessageBox.Show("Файла с дневни данни трябва да съдържа само една станция!");
                                return;
                            }
                        }

                        i++;                      
                    }
                    resultYears.Sort();
                }
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog dialog = new OpenFileDialog())
            {
                if (dialog.ShowDialog(this) == DialogResult.OK)
                {
                    string sFileName = dialog.FileName;
                    pathFolder2 = sFileName;

                    label4.Text = pathFolder2;
                    label4.Show();

                    string[] lines = System.IO.File.ReadAllLines(dialog.FileName);

                    int i = 0;

                    foreach (var line in lines)
                    {
                        var splittedValues = line.Split(',');

                        var firstWord = splittedValues[0];
                        var firstYear2 = splittedValues[1];

                        if (!resultYears2.Contains(firstYear2))
                        {
                            resultYears2.Add(firstYear2);
                        }

                        if (i == 0)
                        {
                            resultStation2 = firstWord;
                        }
                        else
                        {
                            if (resultStation2 != firstWord)
                            {
                                MessageBox.Show("Файла с месечни данни трябва съдържа само една станция!");
                                return;
                            }
                        }

                        i++;
                    }

                    resultYears2.Sort();
                }
            }
        }

        public void label3_Click(object sender, EventArgs e)
        {

        }

        public void label4_Click(object sender, EventArgs e)
        {

        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (resultStation != resultStation2)
            {
                MessageBox.Show("Номера на станцията в единия файл не отговаря на номера на станцията в другият файл!" + Environment.NewLine + Environment.NewLine +
                    "ЗАБЕЛЕЖКА!" + Environment.NewLine + Environment.NewLine + "В двата файла, номера на станцията трябва да бъде един и същ!");
            }

            comboBox1.Items.Add(resultStation);

            if (string.Join(", ", resultYears) == string.Join(", ", resultYears2))
            //if (resultYears.Equals(resultYears2))
            {
                for (int i = 0; i < this.resultYears.Count; i++)
                {
                    comboBox2.Items.Add(resultYears[i]);
                }
            }
            else
            {
                MessageBox.Show("Годините от двата файла не съвпадат.");
            }

        }
    }
}

Answer 1

我一直在看这个问题半小时，我仍然不知道你想要完成什么。

要获得这一年，你会做这样的事情：

string[][] data = File.ReadLines(path).Select(r => r.Split(',')).Where(r => r[0] == station && r[1] == year).ToArray();

据我所知，所有1月份的数字都在第4列，如果你想阅读总和，你可以这样做：

double sum = data.Select(r => r[3]).Where(v => v != "").Sum(v => Double.Parse(v));

希望这能帮助你完成任务。