How Can I Monitor File System Changes in C#?

Use FileSystemWatcher to monitor file system changes in C#

In C#, use the FileSystemWatcher class to conveniently receive notifications when files on disk are modified.

Implementation method:

The

FileSystemWatcher class provides an event-based mechanism to monitor changes in the file system. To use this feature, create an instance of FileSystemWatcher, specify the path to monitor, and configure the required notification filters.

Code example:

<code class="language-csharp">public void CreateFileWatcher(string path)
{
    // 创建并配置 FileSystemWatcher
    FileSystemWatcher watcher = new FileSystemWatcher();
    watcher.Path = path;
    watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName;
    watcher.Filter = "*.txt";

    // 为各种更改类型添加事件处理程序
    watcher.Changed += OnChanged;
    watcher.Created += OnCreated;
    watcher.Deleted += OnDeleted;
    watcher.Renamed += OnRenamed;

    // 启动监视器
    watcher.EnableRaisingEvents = true;
}</code>

Event handler:

The

FileSystemWatcher class provides specific event handlers for each type of file system change. These event handlers allow you to define actions to be performed when a file is changed, created, deleted, or renamed.

For example, OnChanged an event handler can perform specific actions when a file is modified, such as logging the changes.

Event handling example:

<code class="language-csharp">private static void OnChanged(object source, FileSystemEventArgs e)
{
    Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
}

private static void OnCreated(object source, FileSystemEventArgs e)
{
    Console.WriteLine("File Created: " + e.FullPath);
}

private static void OnDeleted(object source, FileSystemEventArgs e)
{
    Console.WriteLine("File Deleted: " + e.FullPath);
}

private static void OnRenamed(object source, RenamedEventArgs e)
{
    Console.WriteLine("File Renamed: " + e.OldFullPath + " to " + e.FullPath);
}</code>

By using the FileSystemWatcher class you can effectively monitor changes in your file system and take appropriate actions based on detected changes.

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