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VB.Net - Windows文件系統(tǒng)

2018-12-19 09:30 更新

VB.Net允許您使用各種目錄和文件相關的類，如DirectoryInfo類和FileInfo類處理目錄和文件。

DirectoryInfo類

DirectoryInfo類是從FileSystemInfo類派生的。它有各種方法來創(chuàng)建，移動和瀏覽目錄和子目錄。此類不能繼承。

以下是DirectoryInfo類的一些常用屬性：

S.N	屬性名稱和說明
1	Attributes Gets the attributes for the current file or directory. 獲取當前文件或目錄的屬性。
2	CreationTime Gets the creation time of the current file or directory. 獲取當前文件或目錄的創(chuàng)建時間。
3	Exists Gets a Boolean value indicating whether the directory exists. 獲取指示該目錄是否存在的布爾值。
4	Extension Gets the string representing the file extension. 獲取表示文件擴展名的字符串。
5	FullName Gets the full path of the directory or file. 獲取目錄或文件的完整路徑。
6	LastAccessTime Gets the time the current file or directory was last accessed. 獲取上次訪問當前文件或目錄的時間。
7	Name Gets the name of this DirectoryInfo instance. 獲取此DirectoryInfo實例的名稱。

以下是DirectoryInfo類的一些常用方法：

S.N	方法名稱和用途
1	Public Sub Create Creates a directory. 創(chuàng)建目錄。
2	Public Function CreateSubdirectory (path As String ) As DirectoryInfo Creates a subdirectory or subdirectories on the specified path. The specified path can be relative to this instance of the DirectoryInfo class. 在指定的路徑上創(chuàng)建子目錄或子目錄。指定的路徑可以相對于DirectoryInfo類的此實例。
3	Public Overrides Sub Delete Deletes this DirectoryInfo if it is empty. 如果DirectoryInfo為空，則刪除它。
4	Public Function GetDirectories As DirectoryInfo() Returns the subdirectories of the current directory. 返回當前目錄的子目錄。
5	Public Function GetFiles As FileInfo() Returns a file list from the current directory. 從當前目錄返回文件列表。

有關屬性和方法的完整列表，請訪問Microsoft的文檔。

FileInfo類

FileInfo類是從FileSystemInfo類派生的。它具有用于創(chuàng)建，復制，刪除，移動和打開文件的屬性和實例方法，并且有助于創(chuàng)建FileStream對象。此類不能繼承。

以下是FileInfo類的一些常用屬性：

S.N	屬性名稱和說明
1	Attributes Gets the attributes for the current file. 獲取當前文件的屬性。
2	CreationTime Gets the creation time of the current file. 獲取當前文件的創(chuàng)建時間。
3	Directory Gets an instance of the directory, which the file belongs to. 獲取該文件所屬的目錄的實例。
4	Exists Gets a Boolean value indicating whether the file exists. 獲取指示文件是否存在的布爾值。
5	Extension Gets the string representing the file extension. 獲取表示文件擴展名的字符串。
6	FullName Gets the full path of the file. 獲取文件的完整路徑。
7	LastAccessTime Gets the time the current file was last accessed. 獲取當前文件上次訪問的時間。
8	LastWriteTime Gets the time of the last written activity of the file. 獲取文件的上次寫入活動的時間。
9	Length Gets the size, in bytes, of the current file. 獲取當前文件的大?。ㄒ宰止?jié)為單位）。
10	Name Gets the name of the file. 獲取文件的名稱。

以下是FileInfo類的一些常用方法：

S.N	方法名稱和用途
1	Public Function AppendText As StreamWriter Creates a StreamWriter that appends text to the file represented by this instance of the FileInfo. 創(chuàng)建一個StreamWriter，將文本附加到由FileInfo的實例表示的文件。
2	Public Function Create As FileStream Creates a file. 創(chuàng)建文件。
3	Public Overrides Sub Delete Deletes a file permanently. 永久刪除文件。
4	Public Sub MoveTo (destFileName As String ) Moves a specified file to a new location, providing the option to specify a new file name. 將指定的文件移動到新位置，提供指定新文件名的選項。
5	Public Function Open (mode As FileMode) As FileStream Opens a file in the specified mode. 以指定模式打開文件。
6	Public Function Open (mode As FileMode, access As FileAccess ) As FileStream Opens a file in the specified mode with read, write, or read/write access. 以指定模式打開具有讀取，寫入或讀/寫訪問權限的文件。
7	Public Function Open (mode As FileMode, access As FileAccess, share As FileShare ) As FileStream Opens a file in the specified mode with read, write, or read/write access and the specified sharing option. 以指定模式打開具有讀取，寫入或讀/寫訪問權限以及指定的共享選項的文件。
8	Public Function OpenRead As FileStream Creates a read-only FileStream 創(chuàng)建只讀FileStream
9	Public Function OpenWrite As FileStream Creates a write-only FileStream. 創(chuàng)建只寫FileStream。

有關屬性和方法的完整列表，請訪問Microsoft的文檔

示例：

以下示例演示了上述類的使用：

Imports System.IO
Module fileProg
   Sub Main()
      'creating a DirectoryInfo object
      Dim mydir As DirectoryInfo = New DirectoryInfo("c:\Windows")
      ' getting the files in the directory, their names and size
      Dim f As FileInfo() = mydir.GetFiles()
      Dim file As FileInfo
      For Each file In f
          Console.WriteLine("File Name: {0} Size: {1}  ", file.Name, file.Length)
      Next file
      Console.ReadKey()
   End Sub
End Module

當編譯和運行程序時，它在Windows目錄中顯示文件名及其大小。

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