[C＃面向对象的读取文本文件

Question

我阅读了文件夹中的文本文件，获得了每一列的绝对值，并在datagrid中显示了最大值和文件名。但是我需要在类中编写方法，并在form.cs中而不是在form.cs中调用它。你能帮助我吗？我的代码是这样的：

DirectoryInfo info = new DirectoryInfo(@"D:\Desktop\..");
FileInfo[] Files = info.GetFiles("*.txt"); 
List<string> list = new List<string>();
List<Double> values= new List<Double>();

foreach (FileInfo file in Files)
    {
         string name = info.Name;

         list.Add(file.Name);
         string[] lines = System.IO.File.ReadAllLines(@"D:\Desktop\..\" + file, Encoding.GetEncoding("windows-1254")); 

         values.AddRange(MultiColumns(lines));

    }

private List<Double> MultiColumns(String[] strs)
    {
        double col1Max = 0; 
        double col2Max = 0;
        double col3Max = 0;
        var list = new List<Double>();
        var format = new NumberFormatInfo();
        format.NegativeSign = "-";
        format.NumberNegativePattern = 1;
        format.NumberDecimalSeparator = ".";

        foreach (var row in strs)
        {
            var rowElements = row.Split(',');


            Double temp1 = 0;
            Double temp2 = 0;
            Double temp3 = 0;

            Double.TryParse(rowElements[0], NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign, format, out temp1);
            Double.TryParse(rowElements[1], NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign, format, out temp2);
            Double.TryParse(rowElements[2], NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign, format, out temp3);


            col1Max = getMax(col1Max, temp1);
            col2Max = getMax(col2Max, temp2);
            col3Max = getMax(col3Max, temp3);

        }

        list.Add(col1Max);
        list.Add(col2Max);
        list.Add(col3Max);
        return list;
    }

    private double getMax(double colMax, double temp)
    {

        //Math.Abs(colMax);
        if (temp < 0)
        {
            temp *= -1;
        }
        if (temp > colMax)
        {
            colMax = temp;
        }
        return colMax;
    }

Answer 1

尝试以下内容：

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 System.Globalization;

namespace WindowsFormsApplication4
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)
        {
            string folder = @"D:\Desktop\..";
            ReadTextFile readTextFile = new ReadTextFile(folder);
        }


    }

    public class ReadTextFile
    {
        public List<string> list { get; set; }
        public List<Double> values { get; set; }
        public ReadTextFile(string folder)
        {
            DirectoryInfo info = new DirectoryInfo(folder);
            FileInfo[] Files = info.GetFiles("*.txt");
            list = new List<string>();
            values = new List<Double>();

            foreach (FileInfo file in Files)
            {

                string name = info.Name;


                list.Add(file.Name);
                string[] lines = System.IO.File.ReadAllLines(folder + file,
                                                            Encoding.GetEncoding("windows-1254"));


                values.AddRange(MultiColumns(lines));

            }
        }
        private List<double> MultiColumns(String[] strs)
        {

            double col1Max = 0;
            double col2Max = 0;
            double col3Max = 0;
            var list = new List<Double>();
            var format = new NumberFormatInfo();
            format.NegativeSign = "-";
            format.NumberNegativePattern = 1;
            format.NumberDecimalSeparator = ".";

            foreach (var row in strs)
            {
                var rowElements = row.Split(',');


                Double temp1 = 0;
                Double temp2 = 0;
                Double temp3 = 0;

                Double.TryParse(rowElements[0], NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign, format, out temp1);
                Double.TryParse(rowElements[1], NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign, format, out temp2);
                Double.TryParse(rowElements[2], NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign, format, out temp3);


                col1Max = getMax(col1Max, temp1);
                col2Max = getMax(col2Max, temp2);
                col3Max = getMax(col3Max, temp3);

            }

            list.Add(col1Max);
            list.Add(col2Max);
            list.Add(col3Max);
            return list;
        }

        private double getMax(double colMax, double temp)
        {

            //Math.Abs(colMax);
            if (temp < 0)
            {
                temp *= -1;
            }
            if (temp > colMax)
            {
                colMax = temp;
            }
            return colMax;
        }
    }
}

Answer 2

您可以简单地将Linq作为单行代码执行所有这些操作：

var results = Directory.GetFiles(@"D:\Desktop\..","*.txt")
   .Select(file => new { file, max = File.ReadAllLines().Select(x=> double.Parse(x)).Max()});

如果您还希望获得所有最大值中的最大值：

allMax = result.Max(x => x.max);

测试：

foreach(var item in results)
   Console.WriteLine($"file: {item.file} - max: {item.max}");