FileSystemInfo.LastAccessTimeUtc 属性
定义
获取或设置上次访问当前文件或目录的时间,其格式为协调世界时 (UTC)。Gets or sets the time, in coordinated universal time (UTC), that the current file or directory was last accessed.
public:
property DateTime LastAccessTimeUtc { DateTime get(); void set(DateTime value); };
public DateTime LastAccessTimeUtc { get; set; }
[System.Runtime.InteropServices.ComVisible(false)]
public DateTime LastAccessTimeUtc { get; set; }
member this.LastAccessTimeUtc : DateTime with get, set
[<System.Runtime.InteropServices.ComVisible(false)>]
member this.LastAccessTimeUtc : DateTime with get, set
Public Property LastAccessTimeUtc As DateTime
属性值
上次访问当前文件或目录的 UTC 时间。The UTC time that the current file or directory was last accessed.
- 属性
例外
当前操作系统不是 Windows NT 或更高版本。The current operating system is not Windows NT or later.
调用方试图设置无效的访问时间。The caller attempts to set an invalid access time.
注解
备注
此方法可能会返回不正确的值,因为它使用的本机函数的值可能不会持续由操作系统进行更新。This method may return an inaccurate value because it uses native functions whose values may not be continuously updated by the operating system.
LastAccessTimeUtc如果对象的当前实例 FileSystemInfo 是从以下任一方法返回的,则该属性的值将被预先缓存 DirectoryInfo :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:
若要获取最新值,请调用 Refresh 方法。To get the latest value, call the Refresh method.
如果对象中描述的文件 FileSystemInfo 不存在,则此属性返回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. 。协调世界时 (UTC)。(C.E.) Coordinated Universal Time (UTC).
有关常见 i/o 任务的列表,请参阅 常见 I/o 任务。For a list of common I/O tasks, see Common I/O Tasks.