FileSystemInfo.LastWriteTimeUtc FileSystemInfo.LastWriteTimeUtc FileSystemInfo.LastWriteTimeUtc FileSystemInfo.LastWriteTimeUtc Property

定義

取得或設定目前檔案或目錄上次被寫入的時間,其格式為 Coordinated Universal Time (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

屬性值

目前檔案上次被寫入的 UTC 時間。The UTC time when the current file was last written to.

例外狀況

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寫入時間。The caller attempts to set an invalid write time.

備註

注意

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LastWriteTimeUtc實例是從下列DirectoryInfo任何一種方法傳回, 則會預先快取屬性的值: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:

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

如果FileSystemInfo物件中所描述的檔案或目錄不存在, 或是包含此檔案或目錄的檔案系統不支援這項資訊, 則此屬性會傳回12:00 年1月 1601 1 日午夜If 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. 西元國際標準時間 (UTC)。(C.E.) Coordinated Universal Time (UTC).

安全性

FileIOPermission
用於設定上次寫入時間。for setting the last write time. 相關聯的列舉:WriteAssociated enumeration: Write

適用於

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