FileSystemInfo.LastWriteTimeUtc 属性

定义

获取或设置上次写入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), when the current file or directory was last written to.

public:
 property DateTime LastWriteTimeUtc { DateTime get(); void set(DateTime value); };
[System.Runtime.InteropServices.ComVisible(false)]
public DateTime LastWriteTimeUtc { get; set; }
member this.LastWriteTimeUtc : DateTime with get, set
Public Property LastWriteTimeUtc As DateTime

属性值

上次写入当前文件的 UTC 时间。The UTC time when the current file was last written to.

属性

异常

Refresh() 不能初始化数据。Refresh() cannot initialize the data.

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写入时间。The caller attempts to set an invalid write 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.

如果FileSystemInfo对象的当前LastWriteTimeUtc实例是从以下DirectoryInfo任一方法返回的, 则该属性的值将被预先缓存:The value of the LastWriteTimeUtc 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Refresh调用方法。To get the latest value, call the Refresh method.

如果FileSystemInfo对象中描述的文件或目录不存在, 或者包含此文件或目录的文件系统不支持此信息, 则此属性将返回12:00 年1月1日午夜1601If the file or directory described in the FileSystemInfo object does not exist, or if the file system that contains this file or directory does not support this information, this property returns 12:00 midnight, January 1, 1601 A.D. 公元协调世界时 (UTC)。(C.E.) Coordinated Universal Time (UTC).

安全性

FileIOPermission
用于设置上次写入时间。for setting the last write time. 关联的枚举:WriteAssociated enumeration: Write

适用于

另请参阅