VB实现的递归复制文件和搜索文件的代码分享-中华考试网

VB实现的递归复制文件和搜索文件的代码分享

2017-7-5编辑:daibenhua

在程序中要做一个复制文件夹的功能，用递归写起来很方便。后来要某位仁兄（自己知道就行了 - -）实现一个类似的，貌似不是那么顺利，这里把复制文件夹的递归代码丢出来：

Public Shared Sub CopyDirectory(source As String, destination As String) 
  If Directory.Exists(destination) = False Then
    Try
      Directory.CreateDirectory(destination) 
    Catch ex As Exception 
      Logger.LogError(Logger.SourceType.Application, "Copy build process: Cannot create folder: " & destination) 
      Return
    End Try
  End If
    
  For Each paths As String In Directory.GetDirectories(source) 
    CopyDirectory(paths, Path.Combine(destination, paths.Substring(paths.LastIndexOfAny({""c, "/"c}) + 1))) 
  Next
    
  For Each files As String In Directory.GetFiles(source) 
    Try
      File.Copy(files, Path.Combine(destination, files.Substring(files.LastIndexOfAny({""c, "/"c}) + 1)), True) 
      _copiedFiles += 1 
    Catch ex As Exception 
      Logger.LogError(Logger.SourceType.Application, "Copy build process: Cannot copy file: " & files) 
    End Try
  Next
    
End Sub

递归的程序实在是很简洁很漂亮吧？后来又写了一个在文件夹中搜索文件的方法，也是递归的，那么在这里就一并丢出来：

''' 
''' Search the specified file in the folder and its sub folders and return its full path name. Empty string if not found. 
''' 
''' The file to search (no folder). 
''' 
Public Shared Function SearchFile(folder As String, fileName As String) As String
  If Directory.Exists(folder) = False Then Return String.Empty 
    
  fileName = fileName.Trim.ToLower 
    
  If fileName.IndexOfAny({""c, "/"c}) >= 0 Then
    fileName = GetFileName(fileName) 
  End If
    
  Dim list() As String = Directory.GetFiles(folder) 
    
  For i As Integer = 0 To list.GetUpperBound(0) 
    If GetFileName(list(i)).Trim.ToLower = fileName Then Return list(i) 
  Next
    
  Dim directories() As String = Directory.GetDirectories(folder) 
    
  For i As Integer = 0 To directories.GetUpperBound(0) 
    Dim return_file As String = SearchFile(directories(i), fileName) 
    
    If return_file.Length > 0 Then Return return_file 
  Next
    
  Return String.Empty 
End Function

　　GetFileName是我自己写的一个把路径去掉只剩下文件名和扩展名的方法。

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