C# フォルダ監視(ファイル追加・更新チェック)

簡易的なフォルダの監視ソフトを作ってみた。削除は検知せず、更新(ファイルサイズ)と追加のみ。

拠点間でのファイルの提出をシステム化しようとなり、先ず全てプログラム化かなとも考えたのだが、現状、ファイルの雛形の整理ができていないので、項目全てをプログラムに落とし込むには時間がかかってしまう。

それなら、ファイルそのものをフォルダに入れておけばいいだろうと考え監視ソフトを作ってみた。もっと高機能なソフトがフリーでもあるけど、自作しておくと後々ファイルの名称などでフィルタをかけたり自由にできる。

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

using System.Xml.Serialization;
using System.IO;

namespace FileUpdateCheck
{
    public partial class Form1 : Form
    {
        string _XmlPath = Application.StartupPath + @"\dat_path.xml";
        string _XmlFileList = Application.StartupPath + @"\dat_file_list.xml";

        Timer _Timer = new Timer();
        List<MyFileInfo> _BeforeFileList = new List<MyFileInfo>();

        public Form1()
        {
            InitializeComponent();

            EventAttach();
            SetNotifyIcon();

            _Timer.Interval = 1000 * 60; // 1分
            _Timer.Tick += (s, e) => TimerWork();

            ButtonStateChange(ButtonState.waiting);

            if (File.Exists(_XmlPath))
            {
                string path = "";
                using (StreamReader sr = new StreamReader(_XmlPath, Encoding.UTF8))
                {
                    path = (string)new XmlSerializer(typeof(string)).Deserialize(sr);
                }

                if (Directory.Exists(path))
                {
                    TargetFolderPath.Text = path;
                    // PathのXmlが存在し、Pathが有効ならTextboxへ

                    if (File.Exists(_XmlFileList))
                    {
                        using (StreamReader sr = new StreamReader(_XmlFileList, Encoding.UTF8))
                        {
                            _BeforeFileList = new List<MyFileInfo>((List<MyFileInfo>)new XmlSerializer(typeof(List<MyFileInfo>)).Deserialize(sr));
                        }

                        // 自動起動するのはXMLが2つ有った場合
                        // FileListのXmlはストップ時削除するので、2つある場合、ストップしていないということ
                        _Timer.Start();

                        ButtonStateChange(ButtonState.working);
                        WindowState = FormWindowState.Minimized;
                        ShowInTaskbar = false;

                    }
                }
            }
        }

        private void EventAttach()
        {
            this.ClientSizeChanged += (s, e) =>
            {
                if (WindowState == FormWindowState.Minimized)
                {
                    ShowInTaskbar = false;
                }
            };

            this.FormClosing += (s, e) =>
            {
                e.Cancel = true;
                WindowState = FormWindowState.Minimized;
            };

            StartButton.Click += (s, e) => StartWatch();
            StopButton.Click += (s, e) => StopWatch();
            ExitButton.Click += (s, e) =>
            {
                DialogResult yesNo = MessageBox.Show("終了しますか？", "", MessageBoxButtons.YesNo);
                if (yesNo == DialogResult.No) return;
                Application.Exit();
            };
        }

        private void SetNotifyIcon()
        {
            Bitmap darkGreenBitmap = new Bitmap(32, 32);
            Graphics darkGreenGraphics = Graphics.FromImage(darkGreenBitmap);
            darkGreenGraphics.FillRectangle(Brushes.DarkGreen, darkGreenGraphics.VisibleClipBounds);

            Bitmap greenBitmap = new Bitmap(32, 32);
            Graphics greenGraphics = Graphics.FromImage(greenBitmap);
            greenGraphics.FillRectangle(Brushes.Green, greenGraphics.VisibleClipBounds);

            Icon[] icons = new Icon[] {
                Icon.FromHandle(darkGreenBitmap.GetHicon()),
                Icon.FromHandle(greenBitmap.GetHicon())
            };

            NotifyIcon notifyIcon = new NotifyIcon();
            notifyIcon.Icon = Icon.FromHandle(darkGreenBitmap.GetHicon());
            notifyIcon.Visible = true;
            notifyIcon.Click += new EventHandler((object sender, EventArgs e) => {
                WindowState = FormWindowState.Normal;
                ShowInTaskbar = true;
            });

            int i = 0;
            var t = new Timer();
            t.Interval = 1000;
            t.Tick += (s, e) =>
            {
                notifyIcon.Icon = icons[i++];
                if (i == 2) i = 0;
            };
            t.Start();
        }

        private void TimerWork()
        {
            List<string> message = new List<string>();

            if (_BeforeFileList.Count > 0)
            {
                foreach(var currentFileInfo in GetCurrentMyFileInfoList())
                {
                    bool isNew = true;
                    bool isUpdate = false;

                    foreach (var beforeFileInfo in _BeforeFileList)
                    {
                        if (currentFileInfo.Name == beforeFileInfo.Name)
                        {
                            isNew = false;
                            if (currentFileInfo.Length != beforeFileInfo.Length) isUpdate = true;
                        }
                    }

                    if (isNew) message.Add("新規：　" + currentFileInfo.Name);
                    if (isUpdate) message.Add("更新：　" + currentFileInfo.Name);
                }
            }

            _BeforeFileList.Clear();
            _BeforeFileList = new List<MyFileInfo>(GetCurrentMyFileInfoList());

            using (StreamWriter sw = new StreamWriter(_XmlFileList, false, Encoding.UTF8))
            {
                new XmlSerializer(typeof(List<MyFileInfo>)).Serialize(sw, _BeforeFileList);
            }

            if (message.Count > 0) MessageBox.Show(string.Join(Environment.NewLine, message));
        }

        private List<MyFileInfo> GetCurrentMyFileInfoList()
        {
            List<MyFileInfo> fileInfoList = new List<MyFileInfo>();
            foreach (string file in Directory.GetFiles(TargetFolderPath.Text, "*", SearchOption.TopDirectoryOnly))
            {
                var fi = new FileInfo(file);
                fi.Refresh();
                fileInfoList.Add(new MyFileInfo { 
                    Name = fi.Name,
                    Length = fi.Length
                });
            }
            return fileInfoList;
        }

        private void StartWatch()
        {
            if(!Directory.Exists(TargetFolderPath.Text))
            {
                MessageBox.Show("フォルダが存在しません。");
                return;
            }

            using (StreamWriter sw = new StreamWriter(_XmlPath, false, Encoding.UTF8))
            {
                new XmlSerializer(typeof(string)).Serialize(sw, TargetFolderPath.Text);
            }

            TimerWork(); 
            // TimerのTickが実行される前に終了した場合、_XmlFileListが生成されていないため
            // これで2つのXmlが存在する状態になる

            _Timer.Start();

            ButtonStateChange(ButtonState.working);
        }

        private void StopWatch()
        {
            _BeforeFileList.Clear();
            File.Delete(_XmlFileList);
            // 終了時、Xmlは1つ(Pathのみ)となる

            _Timer.Stop();

            ButtonStateChange(ButtonState.waiting);
        }

        enum ButtonState { working, waiting }

        private void ButtonStateChange(ButtonState buttonState)
        {
            switch (buttonState)
            {
                case ButtonState.waiting:
                    StartButton.Enabled = true;
                    StopButton.Enabled = false;
                    TargetFolderPath.Enabled = true;
                    this.Text = "停止中";
                    break;

                case ButtonState.working:
                    StartButton.Enabled = false;
                    StopButton.Enabled = true;
                    TargetFolderPath.Enabled = false;
                    this.Text = "監視中";
                    break;
            }
        }
    }

    public class MyFileInfo
    {
        public string Name;
        public long Length;
    }

}

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Xml.Serialization;

using System.IO;

namespace FileUpdateCheck

{

public partial class Form1 : Form

{

string _XmlPath = Application.StartupPath + @"\dat_path.xml";

string _XmlFileList = Application.StartupPath + @"\dat_file_list.xml";

Timer _Timer = new Timer();

List<MyFileInfo> _BeforeFileList = new List<MyFileInfo>();

public Form1()

{

InitializeComponent();

EventAttach();

SetNotifyIcon();

_Timer.Interval = 1000 * 60; // 1分

_Timer.Tick += (s, e) => TimerWork();

ButtonStateChange(ButtonState.waiting);

if (File.Exists(_XmlPath))

{

string path = "";

using (StreamReader sr = new StreamReader(_XmlPath, Encoding.UTF8))

{

path = (string)new XmlSerializer(typeof(string)).Deserialize(sr);

}

if (Directory.Exists(path))

{

TargetFolderPath.Text = path;

// PathのXmlが存在し、Pathが有効ならTextboxへ

if (File.Exists(_XmlFileList))

{

using (StreamReader sr = new StreamReader(_XmlFileList, Encoding.UTF8))

{

_BeforeFileList = new List<MyFileInfo>((List<MyFileInfo>)new XmlSerializer(typeof(List<MyFileInfo>)).Deserialize(sr));

}

// 自動起動するのはXMLが2つ有った場合

// FileListのXmlはストップ時削除するので、2つある場合、ストップしていないということ

_Timer.Start();

ButtonStateChange(ButtonState.working);

WindowState = FormWindowState.Minimized;

ShowInTaskbar = false;

}

private void EventAttach()

{

this.ClientSizeChanged += (s, e) =>

{

if (WindowState == FormWindowState.Minimized)

{

ShowInTaskbar = false;

}

};

this.FormClosing += (s, e) =>

{

e.Cancel = true;

WindowState = FormWindowState.Minimized;

};

StartButton.Click += (s, e) => StartWatch();

StopButton.Click += (s, e) => StopWatch();

ExitButton.Click += (s, e) =>

{

DialogResult yesNo = MessageBox.Show("終了しますか？", "", MessageBoxButtons.YesNo);

if (yesNo == DialogResult.No) return;

Application.Exit();

};

}

private void SetNotifyIcon()

{

Bitmap darkGreenBitmap = new Bitmap(32, 32);

Graphics darkGreenGraphics = Graphics.FromImage(darkGreenBitmap);

darkGreenGraphics.FillRectangle(Brushes.DarkGreen, darkGreenGraphics.VisibleClipBounds);

Bitmap greenBitmap = new Bitmap(32, 32);

Graphics greenGraphics = Graphics.FromImage(greenBitmap);

greenGraphics.FillRectangle(Brushes.Green, greenGraphics.VisibleClipBounds);

Icon[] icons = new Icon[] {

Icon.FromHandle(darkGreenBitmap.GetHicon()),

Icon.FromHandle(greenBitmap.GetHicon())

};

NotifyIcon notifyIcon = new NotifyIcon();

notifyIcon.Icon = Icon.FromHandle(darkGreenBitmap.GetHicon());

notifyIcon.Visible = true;

notifyIcon.Click += new EventHandler((object sender, EventArgs e) => {

WindowState = FormWindowState.Normal;

ShowInTaskbar = true;

});

int i = 0;

var t = new Timer();

t.Interval = 1000;

t.Tick += (s, e) =>

{

notifyIcon.Icon = icons[i++];

if (i == 2) i = 0;

};

t.Start();

}

private void TimerWork()

{

List<string> message = new List<string>();

if (_BeforeFileList.Count > 0)

{

foreach(var currentFileInfo in GetCurrentMyFileInfoList())

{

bool isNew = true;

bool isUpdate = false;

foreach (var beforeFileInfo in _BeforeFileList)

{

if (currentFileInfo.Name == beforeFileInfo.Name)

{

isNew = false;

if (currentFileInfo.Length != beforeFileInfo.Length) isUpdate = true;

}

if (isNew) message.Add("新規：　" + currentFileInfo.Name);

if (isUpdate) message.Add("更新：　" + currentFileInfo.Name);

}

_BeforeFileList.Clear();

_BeforeFileList = new List<MyFileInfo>(GetCurrentMyFileInfoList());

using (StreamWriter sw = new StreamWriter(_XmlFileList, false, Encoding.UTF8))

{

new XmlSerializer(typeof(List<MyFileInfo>)).Serialize(sw, _BeforeFileList);

}

if (message.Count > 0) MessageBox.Show(string.Join(Environment.NewLine, message));

}

private List<MyFileInfo> GetCurrentMyFileInfoList()

{

List<MyFileInfo> fileInfoList = new List<MyFileInfo>();

foreach (string file in Directory.GetFiles(TargetFolderPath.Text, "*", SearchOption.TopDirectoryOnly))

{

var fi = new FileInfo(file);

fi.Refresh();

fileInfoList.Add(new MyFileInfo {

Name = fi.Name,

Length = fi.Length

});

}

return fileInfoList;

}

private void StartWatch()

{

if(!Directory.Exists(TargetFolderPath.Text))

{

MessageBox.Show("フォルダが存在しません。");

return;

}

using (StreamWriter sw = new StreamWriter(_XmlPath, false, Encoding.UTF8))

{

new XmlSerializer(typeof(string)).Serialize(sw, TargetFolderPath.Text);

}

TimerWork();

// TimerのTickが実行される前に終了した場合、_XmlFileListが生成されていないため

// これで2つのXmlが存在する状態になる

_Timer.Start();

ButtonStateChange(ButtonState.working);

}

private void StopWatch()

{

_BeforeFileList.Clear();

File.Delete(_XmlFileList);

// 終了時、Xmlは1つ(Pathのみ)となる

_Timer.Stop();

ButtonStateChange(ButtonState.waiting);

}

enum ButtonState { working, waiting }

private void ButtonStateChange(ButtonState buttonState)

{

switch (buttonState)

{

case ButtonState.waiting:

StartButton.Enabled = true;

StopButton.Enabled = false;

TargetFolderPath.Enabled = true;

this.Text = "停止中";

break;

case ButtonState.working:

StartButton.Enabled = false;

StopButton.Enabled = true;

TargetFolderPath.Enabled = false;

this.Text = "監視中";

break;

}

public class MyFileInfo

{

public string Name;

public long Length;

}