C# watch for file changes

Date: 2019-10-29

https://stackoverflow.com/a/721743

public class ValidTime
{
    private DateTime _validTo;
    readonly TimeSpan _validTimeSpan;
    private ValidTime(TimeSpan validTimeSpan)
    {
        _validTimeSpan = validTimeSpan;
        _validTo = DateTime.Now.Add(_validTimeSpan);
    }
    public bool IsValid() => DateTime.Now >= _validTo;
    public void Reset() => _validTo = DateTime.Now.Add(_validTimeSpan);
    public static ValidTime From(TimeSpan ts) => new(ts);
}
public class DirectoryWatcher
{
    readonly ValidTime _watcherValidTime;
    readonly string _path;
    readonly Action _action;
    IDisposable _watcher;
    public DirectoryWatcher(string path, TimeSpan validTime, Action action)
    {
        _watcherValidTime = ValidTime.From(validTime);
        _path = path;
        _action = action;
    }
    public void UpdateWatcher(bool checkNow = false)
    {
        if (_watcher != null && _watcherValidTime.IsValid()) return;
        _watcherValidTime.Reset();
        _watcher?.Dispose();
        _watcher = CreateFileWatcher(_path, (object sender, EventArgs e) => _action());
        if (checkNow)
            _action();
    }
    public static IDisposable CreateFileWatcher(string path, EventHandler onSomethingChanged)
    {
        var watcher = new FileSystemWatcher
        {
            Path = path,
            IncludeSubdirectories = true,
        };
        // Add event handlers.
        watcher.Changed += (a, b) => onSomethingChanged(a, b);
        watcher.Created += (a, b) => onSomethingChanged(a, b);
        watcher.Deleted += (a, b) => onSomethingChanged(a, b);
        watcher.Renamed += (a, b) => onSomethingChanged(a, b);
        // Begin watching.
        watcher.EnableRaisingEvents = true;
        return watcher;
    }
}
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public IDisposable WatchForFolderChanges(string path, Action<object, object> onSomethingChanged)
{
var watcher = new FileSystemWatcher
{
Path = path,
IncludeSubdirectories = true,
};
// Add event handlers.
watcher.Changed += (a, b) => onSomethingChanged(a, b);
watcher.Created += (a, b) => onSomethingChanged(a, b);
watcher.Deleted += (a, b) => onSomethingChanged(a, b);
watcher.Renamed += (a, b) => onSomethingChanged(a, b);
// Begin watching.
watcher.EnableRaisingEvents = true;
return watcher;
}
public void CreateFileWatcher(string path)
{
// Create a new FileSystemWatcher and set its properties.
FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Path = path;
/* Watch for changes in LastAccess and LastWrite times, and
the renaming of files or directories. */
watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
| NotifyFilters.FileName | NotifyFilters.DirectoryName;
// Only watch text files.
watcher.Filter = "*.txt";
// Add event handlers.
watcher.Changed += new FileSystemEventHandler(OnChanged);
watcher.Created += new FileSystemEventHandler(OnChanged);
watcher.Deleted += new FileSystemEventHandler(OnChanged);
watcher.Renamed += new RenamedEventHandler(OnRenamed);
// Begin watching.
watcher.EnableRaisingEvents = true;
}
// Define the event handlers.
private static void OnChanged(object source, FileSystemEventArgs e)
{
// Specify what is done when a file is changed, created, or deleted.
Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
}
private static void OnRenamed(object source, RenamedEventArgs e)
{
// Specify what is done when a file is renamed.
Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath);
}
public IDisposable WatchForFolderChanges(string path, Action<object, object> onSomethingChanged) { var watcher = new FileSystemWatcher { Path = path, IncludeSubdirectories = true, }; // Add event handlers. watcher.Changed += (a, b) => onSomethingChanged(a, b); watcher.Created += (a, b) => onSomethingChanged(a, b); watcher.Deleted += (a, b) => onSomethingChanged(a, b); watcher.Renamed += (a, b) => onSomethingChanged(a, b); // Begin watching. watcher.EnableRaisingEvents = true; return watcher; } public void CreateFileWatcher(string path) { // Create a new FileSystemWatcher and set its properties. FileSystemWatcher watcher = new FileSystemWatcher(); watcher.Path = path; /* Watch for changes in LastAccess and LastWrite times, and the renaming of files or directories. */ watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName; // Only watch text files. watcher.Filter = "*.txt"; // Add event handlers. watcher.Changed += new FileSystemEventHandler(OnChanged); watcher.Created += new FileSystemEventHandler(OnChanged); watcher.Deleted += new FileSystemEventHandler(OnChanged); watcher.Renamed += new RenamedEventHandler(OnRenamed); // Begin watching. watcher.EnableRaisingEvents = true; } // Define the event handlers. private static void OnChanged(object source, FileSystemEventArgs e) { // Specify what is done when a file is changed, created, or deleted. Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType); } private static void OnRenamed(object source, RenamedEventArgs e) { // Specify what is done when a file is renamed. Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath); }
        public IDisposable WatchForFolderChanges(string path, Action<object, object> onSomethingChanged)
        {
            var watcher = new FileSystemWatcher
            {
                Path = path,
                IncludeSubdirectories = true,
            };

            // Add event handlers.
            watcher.Changed += (a, b) => onSomethingChanged(a, b);
            watcher.Created += (a, b) => onSomethingChanged(a, b);
            watcher.Deleted += (a, b) => onSomethingChanged(a, b);
            watcher.Renamed += (a, b) => onSomethingChanged(a, b);

            // Begin watching.
            watcher.EnableRaisingEvents = true;
            return watcher;
        }


public void CreateFileWatcher(string path)
{
    // Create a new FileSystemWatcher and set its properties.
    FileSystemWatcher watcher = new FileSystemWatcher();
    watcher.Path = path;
    /* Watch for changes in LastAccess and LastWrite times, and 
       the renaming of files or directories. */
    watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite 
       | NotifyFilters.FileName | NotifyFilters.DirectoryName;
    // Only watch text files.
    watcher.Filter = "*.txt";

    // Add event handlers.
    watcher.Changed += new FileSystemEventHandler(OnChanged);
    watcher.Created += new FileSystemEventHandler(OnChanged);
    watcher.Deleted += new FileSystemEventHandler(OnChanged);
    watcher.Renamed += new RenamedEventHandler(OnRenamed);

    // Begin watching.
    watcher.EnableRaisingEvents = true;
}

// Define the event handlers.
private static void OnChanged(object source, FileSystemEventArgs e)
{
    // Specify what is done when a file is changed, created, or deleted.
   Console.WriteLine("File: " +  e.FullPath + " " + e.ChangeType);
}

private static void OnRenamed(object source, RenamedEventArgs e)
{
    // Specify what is done when a file is renamed.
    Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath);
}
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