两种方式遍历文件夹

「爱情、让人受尽委屈。」 2021-12-15 08:57 315阅读 0赞

两种方式遍历文件夹

我用两种方式遍历文件夹,一种就是用FOR EACH普通的编程技巧. 第二种是用Composite.  
比较两种方式,觉得Composite要复杂的多,代码也多.  
也没觉得有什么好处, 可能这么简单情况根本就不应该使用模式  
请大家解释解释我这里如果用Composite是不是真的一点的好处也没有. 谢谢了  
  
第一种代码如下:  
Imports  System  
Imports  System.IO  
Module  Module1   
Sub Main()  
Dim objListAll As New ListDir  
Console.WriteLine("C:\\Drivers")  
objListAll.ListAll( New DirectoryInfo("C:\\Drivers"), " ")  
Console.ReadLine()  
End Sub  
End  Module  
  
Class  ListDir  
Shared intentLevel As Int16  
Shared Sub ListAll( ByVal source As DirectoryInfo, ByVal INTENT As String )  
intentLevel += 1  
' Copy each file into it's new directory.  
 For Each fi As FileInfo In source.GetFiles()  
Console.WriteLine(" ".PadLeft(intentLevel) & fi.Name)  
Next  
' Copy each subdirectory using recursion.  
 For Each diSourceSubDir As DirectoryInfo In source.GetDirectories()  
Console.WriteLine("+".PadLeft(intentLevel) & diSourceSubDir.ToString)  
ListAll(diSourceSubDir, " ".PadLeft(intentLevel))  
intentLevel -= 1  
Next  
 End Sub  
End  Class  
  
第二种代码如下:

Imports System  
  
Imports System.Collections  
  
Imports System.IO  
  
Module Module1  
  
Sub Main()  
  
Dim root As Composite = New Composite("C:\\Drivers")  
  
Dim comp As Composite = New Composite("A")  
  
comp.Add(root)  
  
Console.Read()  
  
End Sub  
  
End Module  
  
' "Component"  
  
Public MustInherit Class Component  
  
Public name As String  
  
' Constructor  
  
Public Sub New(ByVal name As String)  
  
Me.name = name  
  
End Sub  
  
Public Overridable Sub Add(ByVal c As Component)  
  
End Sub  
  
End Class  
  
' "Leaf"  
  
Class Leaf  
  
Inherits Component  
  
Public Sub New(ByVal name As String)  
  
MyBase.New(name)  
  
End Sub  
  
Public Overrides Sub Add(ByVal c As Component)  
  
Me.Add(c)  
  
End Sub  
  
End Class  
  
'"Composite"  
  
Class Composite  
  
Inherits Component  
  
Public Sub New(ByVal name As String)  
  
MyBase.New(name)  
  
End Sub  
  
Private children As ArrayList = New ArrayList  
  
Public Overrides Sub Add(ByVal c As Component)  
  
If Directory.Exists(c.name) Then  
  
Dim stringDirecotrys As String() = Directory.GetDirectories(c.name)  
  
For Each stringDirectory As String In stringDirecotrys  
  
Dim directory As Composite = New Composite(stringDirectory)  
  
Console.WriteLine(stringDirectory)  
  
Me.Add(Directory)  
  
Next  
  
End If  
  
Dim stringFiles As String() = directory.GetFiles(c.name)  
  
For Each stringFile As String In stringFiles  
  
Dim file As Leaf = New Leaf(stringFile)  
  
Console.WriteLine(stringFile)  
  
children.Add(File)  
  
Next  
  
End Sub  
  
End Class

转载于:https://www.cnblogs.com/yangbin990/archive/2007/12/13/994019.html