FileSystemInfo.LastAccessTimeUtc 屬性


取得或設定目前檔案或目錄上次被存取的時間,其格式為 Coordinated Universal Time (UTC)。Gets or sets the time, in coordinated universal time (UTC), that the current file or directory was last accessed.

 property DateTime LastAccessTimeUtc { DateTime get(); void set(DateTime value); };
public DateTime LastAccessTimeUtc { get; set; }
public DateTime LastAccessTimeUtc { get; set; }
member this.LastAccessTimeUtc : DateTime with get, set
Public Property LastAccessTimeUtc As DateTime


目前檔案或目錄上次被存取的 UTC 時間。The UTC time that the current file or directory was last accessed.



Refresh() 無法初始化資料。Refresh() cannot initialize the data.

目前的作業系統不是 Windows NT 或更新版本。The current operating system is not Windows NT or later.

呼叫端嘗試設定無效的存取時間。The caller attempts to set an invalid access time.



這個方法可能會傳回不正確的值,因為它會使用原生函式,其值可能不會由作業系統持續更新。This method may return an inaccurate value because it uses native functions whose values may not be continuously updated by the operating system.

如果 FileSystemInfo 物件的目前實例是從下列任何一種 DirectoryInfo 方法傳回,則會預先快取 LastAccessTimeUtc 屬性的值:The value of the LastAccessTimeUtc property is pre-cached if the current instance of the FileSystemInfo object was returned from any of the following DirectoryInfo methods:

若要取得最新的值,請呼叫 Refresh 方法。To get the latest value, call the Refresh method.

如果 FileSystemInfo 物件中所描述的檔案不存在,此屬性會傳回12:00 年1月 1601 1 日午夜If the file described in the FileSystemInfo object does not exist, this property returns 12:00 midnight, January 1, 1601 A.D. 國際標準時間(UTC)(C.E.) Coordinated Universal Time (UTC).

如需一般 i/o 工作的清單,請參閱一般 i/o工作。For a list of common I/O tasks, see Common I/O Tasks.