namespace FileSystemWatcherTest {
class Program {
private static ConcurrentDictionary<string, DateTime> dic = new ConcurrentDictionary<string, DateTime>();
static void Main(string[] args) {
var watcher = new FileSystemWatcher {
// 設定要監看的資料夾
Path = @"監看路徑",
// 設定要監看的變更類型(修改=LastWrite/新增&刪除=FileName/更名=Attributes)
NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.Attributes,
// 設定要監看的檔案類型
Filter = "*.txt",
// 設定是否監看子資料夾
IncludeSubdirectories = true,
// 設定是否啟動元件，必須要設定為 true，否則監看事件是不會被觸發
EnableRaisingEvents = true
};
// 設定監看事件對應的處理邏輯
watcher.Changed += new FileSystemEventHandler(OnChanged);
watcher.Created += new FileSystemEventHandler(OnCreated);
watcher.Deleted += new FileSystemEventHandler(OnDeleted);
Console.ReadLine();
}
private static void OnDeleted(object sender, FileSystemEventArgs e) {
//只會偵測1次
Console.WriteLine("檔案變更: " + e.FullPath + " " + e.ChangeType);
}
private static void OnCreated(object sender, FileSystemEventArgs e) {
//只會偵測1次
Console.WriteLine("檔案變更: " + e.FullPath + " " + e.ChangeType);
}
private static void OnChanged(object source, FileSystemEventArgs e) {
//會偵測2次
#region 以最後更新時間判斷是否重複偵測變更(參考來源 https://www.cnblogs.com/jzywh/archive/2008/07/23/filesystemwatcher.html)
var currentModifyTime = File.GetLastWriteTime(e.FullPath);
var previousModifyTime = new Func<DateTime>(() => {
DateTime funcResult = DateTime.MinValue;
dic.TryGetValue(e.FullPath, out funcResult);
return funcResult;
})();
if (currentModifyTime == previousModifyTime) {
return;
}
dic.TryRemove(e.FullPath, out previousModifyTime);
dic.TryAdd(e.FullPath, currentModifyTime);
#endregion
Console.WriteLine("檔案變更: " + e.FullPath + " " + e.ChangeType);
}
}
}
