参考

http://www.foxtable.com/bbs/dispbbs.asp?BoardID=2&ID=121108&skin=0

认认真真看懂2楼，测试对应的代码。

你调用的时候，可以设置后缀名的啊

Public Function EnumerateFiles(ByVal path As String, ByVal Optional searchPattern As String = "*.*", ByVal Optional searchOption As IO.SearchOption = IO.SearchOption.AllDirectories)

调用代码

_list.clear
EnumerateFiles("d:\\", "*.mdb")
msgbox(_list.count)

全局代码

Public _list As new List(of String)

<DllImport("kernel32.dll", CharSet:=System.Runtime.InteropServices.CharSet.Auto, SetLastError:=True)> _
Public Function FindFirstFile(ByVal pFileName As String, ByRef pFindFileData As WIN32_FIND_DATA) As IntPtr
End Function
<DllImport("kernel32.dll", CharSet:=System.Runtime.InteropServices.CharSet.Auto, SetLastError:=True)> _
Public Function FindNextFile(ByVal hndFindFile As IntPtr, ByRef lpFindFileData As WIN32_FIND_DATA) As Boolean
End Function
<DllImport("kernel32.dll", SetLastError:=True)> _
Public Function FindClose(ByVal hndFindFile As IntPtr) As Boolean
End Function

<Serializable, StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto), BestFitMapping(False)> _
Public Structure WIN32_FIND_DATA
Public dwFileAttributes As IO.FileAttributes
Public ftCreationTime_dwLowDateTime As UInteger
Public ftCreationTime_dwHighDateTime As UInteger
Public ftLastAccessTime_dwLowDateTime As UInteger
Public ftLastAccessTime_dwHighDateTime As UInteger
Public ftLastWriteTime_dwLowDateTime As UInteger
Public ftLastWriteTime_dwHighDateTime As UInteger
Public nFileSizeHigh As UInteger
Public nFileSizeLow As UInteger
Public dwReserved0 As Integer
Public dwReserved1 As Integer
<MarshalAs(UnmanagedType.ByValTStr, SizeConst:=260)> _
Public cFileName As String
<MarshalAs(UnmanagedType.ByValTStr, SizeConst:=14)> _
Public cAlternateFileName As String
End Structure

Public Function EnumerateFiles(ByVal path As String, ByVal Optional searchPattern As String = "*.*", ByVal Optional searchOption As IO.SearchOption = IO.SearchOption.AllDirectories)
Dim hFind As IntPtr = -1
Dim FindFileData As WIN32_FIND_DATA = Nothing

hFind = FindFirstFile(IO.Path.Combine(path, searchPattern), FindFileData)
If hFind <> -1 Then
   
    Do
        If FindFileData.cFileName.Equals(".") OrElse FindFileData.cFileName.Equals("..") Then Continue Do
        If  searchOption = io.SearchOption.AllDirectories AndAlso ((FindFileData.dwFileAttributes And io.FileAttributes.Directory) = io.FileAttributes.Directory) Then
            EnumerateFiles(io.Path.Combine(path, FindFileData.cFileName))
        Else
            _list.add(io.Path.Combine(path, FindFileData.cFileName))
        End If
    Loop While FindNextFile(hFind, FindFileData)
    FindClose(hFind)
   
End If
If searchPattern <> "*.*" Then
    hFind = FindFirstFile(IO.Path.Combine(path, "*.*"), FindFileData)
    If hFind <> -1 Then
       
        Do
            If FindFileData.cFileName.Equals(".") OrElse FindFileData.cFileName.Equals("..") Then Continue Do
            If  searchOption = io.SearchOption.AllDirectories AndAlso ((FindFileData.dwFileAttributes And io.FileAttributes.Directory) = io.FileAttributes.Directory) Then
                EnumerateFiles(io.Path.Combine(path, FindFileData.cFileName), searchPattern)
            Else
                \'_list.add(io.Path.Combine(path, FindFileData.cFileName))
            End If
        Loop While FindNextFile(hFind, FindFileData)
        FindClose(hFind)
    End If
End If

End Function