005-字串處理不足位元補 0，連續日期產生

一開始的土法煉鋼寫法

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.Net;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        string filePath,Mon,Day,Temp;

        private void button1_Click(object sender, EventArgs e)
        {
            getCSV();
        }

        public void getCSV()
        {
            filePath = Application.StartupPath + @"\test.txt";

            WebClient wc = new WebClient();

            try
            {
                using (FileStream fs = new FileStream(filePath, FileMode.Append))
                {
                    using (StreamWriter sw = new StreamWriter(fs, Encoding.Default))
                    {
                        for (int i = 2011; i <= 2011; i++)
                        {
                            for (int j = 6; j <= 6; j++)
                            {
                                int day;
                                if (DateTime.IsLeapYear(i) == true && j == 2)
                                {
                                    day = 29;
                                }
                                else
                                {
                                    if ((j == 4) || (j == 6) || (j == 9) || (j == 11))
                                    {
                                        day = 10;
                                    }
                                    else if (j == 2)
                                    {
                                        day = 28;
                                    }
                                    else
                                    {
                                        day = 31;
                                    }
                                }

                                for (int k = 1; k <= day; k++)
                                {
                                    if (j < 10 && k < 10)
                                    {
                                        Mon = "0" + j.ToString();
                                        Day = "0" + k.ToString();
                                    }
                                    else if (j > 9 && k < 10)
                                    {
                                        Mon = j.ToString();
                                        Day = "0" + k.ToString();
                                    }
                                    else if (j < 10 && k > 9)
                                    {
                                        Mon = "0" + j.ToString();
                                        Day = k.ToString();
                                    }
                                    else
                                    {
                                        Mon = j.ToString();
                                        Day = k.ToString();
                                    }

                                    sw.WriteLine(i.ToString() + Mon + Day);
                                    Temp = i.ToString() + Mon + Day;

                                }
                            }
                        }
                        sw.Close();
                    }
                    fs.Close();
                }

            }

            catch (IOException ex)
            {

                MessageBox.Show("錯誤訊息:" + ex.Message, "IOException例外");
            }
        }
    }
}

 

 

 

 

 

 

 

 

使用內建的函數後

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.Net;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        string filePath,Mon,Day,Temp;

        private void button1_Click(object sender, EventArgs e)
        {
            getCSV();
        }

        public void getCSV()
        {
            filePath = Application.StartupPath + @"\test.txt";

            WebClient wc = new WebClient();

            try
            {
                using (FileStream fs = new FileStream(filePath, FileMode.Append))
                {
                    using (StreamWriter sw = new StreamWriter(fs, Encoding.Default))
                    {
                        for (int i = 2011; i <= 2011; i++)
                        {
                            for (int j = 1; j <= 12; j++)
                            {
                                int day;
                                if (DateTime.IsLeapYear(i) == true && j == 2)
                                {
                                    day = 29;
                                }
                                else
                                {
                                    if ((j == 4) || (j == 6) || (j == 9) || (j == 11))
                                    {
                                        day = 10;
                                    }
                                    else if (j == 2)
                                    {
                                        day = 28;
                                    }
                                    else
                                    {
                                        day = 31;
                                    }
                                }

                                for (int k = 1; k <= day; k++)
                                {
                                    Mon = j.ToString().PadLeft(2, '0');
                                    Day = k.ToString().PadLeft(2, '0');
                                    Temp = i.ToString() + Mon + Day;
                                    sw.WriteLine(Temp);
                                }
                            }
                        }
                        sw.Close();
                    }
                    fs.Close();
                }

            }

            catch (IOException ex)
            {

                MessageBox.Show("錯誤訊息:" + ex.Message, "IOException例外");
            }
        }
    }
}

 

 

用法:

ToString().PadLeft(2, '0');

ToString().PadRight(8, ‘0’);