在VB .NET中计算目录大小的最佳方法是什么？

Question

我需要在VB的.Net计算目录大小

我知道以下2种方法

方法1：从MSDN http://msdn.microsoft.com/en-us/library/system.io.directory.aspx

“下面的示例计算目录 ”的大小和其子目录（如果有的话），并以字节显示总大小 '。

Imports System 
Imports System.IO 

Public Class ShowDirSize 

Public Shared Function DirSize(ByVal d As DirectoryInfo) As Long 
    Dim Size As Long = 0 
    ' Add file sizes. 
    Dim fis As FileInfo() = d.GetFiles() 
    Dim fi As FileInfo 
    For Each fi In fis 
     Size += fi.Length 
    Next fi 
    ' Add subdirectory sizes. 
    Dim dis As DirectoryInfo() = d.GetDirectories() 
    Dim di As DirectoryInfo 
    For Each di In dis 
     Size += DirSize(di) 
    Next di 
    Return Size 
End Function 'DirSize 

Public Shared Sub Main(ByVal args() As String) 
    If args.Length <> 1 Then 
     Console.WriteLine("You must provide a directory argument at the command line.") 
    Else 
     Dim d As New DirectoryInfo(args(0)) 
     Dim dsize As Long = DirSize(d) 
     Console.WriteLine("The size of {0} and its subdirectories is {1} bytes.", d, dsize) 
    End If 
End Sub 'Main 
End Class 'ShowDirSize 

方法2：从What's the best way to calculate the size of a directory in .NET?

Dim size As Int64 = (From strFile In My.Computer.FileSystem.GetFiles(strFolder, _ 
       FileIO.SearchOption.SearchAllSubDirectories) _ 
       Select New System.IO.FileInfo(strFile).Length).Sum() 

这两种方法很好地工作。但是，如果有大量的子文件夹，他们会花费很多时间来计算目录大小。例如我有一个包含150,000个子文件夹的目录。上述方法需要大约1小时30分钟来计算目录的大小。但是，如果我从窗口检查大小，则需要不到一分钟的时间。

请建议更好更快的方法来计算目录的大小。

Answer 1

Though this answer is talking about Python，这个概念也适用于此处。

Windows资源管理器使用系统API调用FindFirstFile和FindNextFile递归拉文件信息，然后就可以通过该公司透过struct，WIN32_FIND_DATA传回数据非常快速访问文件大小：http://msdn.microsoft.com/en-us/library/aa365740(v=VS.85).aspx。

我的建议是使用P/Invoke实现这些API调用，并且我相信您将体验到显着的性能提升。

Answer 2

并行工作应该使其更快，至少在多核机器上。试试这个C＃代码。你将不得不为VB.NET翻译。

private static long DirSize(string sourceDir, bool recurse) 
{ 
    long size = 0; 
    string[] fileEntries = Directory.GetFiles(sourceDir); 

    foreach (string fileName in fileEntries) 
    { 
     Interlocked.Add(ref size, (new FileInfo(fileName)).Length); 
    } 

    if (recurse) 
    { 
     string[] subdirEntries = Directory.GetDirectories(sourceDir); 

     Parallel.For<long>(0, subdirEntries.Length,() => 0, (i, loop, subtotal) => 
     { 
      if ((File.GetAttributes(subdirEntries[i]) & FileAttributes.ReparsePoint) != FileAttributes.ReparsePoint) 
      { 
       subtotal += DirSize(subdirEntries[i], true); 
       return subtotal; 
      } 
      return 0; 
     }, 
      (x) => Interlocked.Add(ref size, x) 
     ); 
    } 
    return size; 
} 

Answer 3

这是一个简短而甜蜜的代码片段，可以完成工作。你只需要调用该函数基于杰米的答案

Public Class Form1 
Dim TotalSize As Long = 0 
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load 
    TotalSize = 0 'Reset the counter 
    Dim TheSize As Long = GetDirSize("C:\Test") 
    MsgBox(FormatNumber(TheSize, 0) & " Bytes" & vbCr & _ 
      FormatNumber(TheSize/1024, 1) & " Kilobytes" & vbCr & _ 
      FormatNumber(TheSize/1024/1024, 1) & " Megabytes" & vbCr & _ 
      FormatNumber(TheSize/1024/1024/1024, 1) & " Gigabytes") 
End Sub 
Public Function GetDirSize(RootFolder As String) As Long 
    Dim FolderInfo = New IO.DirectoryInfo(RootFolder) 
    For Each File In FolderInfo.GetFiles : TotalSize += File.Length 
    Next 
    For Each SubFolderInfo In FolderInfo.GetDirectories : GetDirSize(SubFolderInfo.FullName) 
    Next 
    Return TotalSize 
End Function 
End Class 

Answer 4

VB代码之前重置计数器：

Imports System.Threading 
Imports System.IO 

Public Function GetDirectorySize(ByVal path As String, Optional recurse As Boolean = False) As Long 
    Dim totalSize As Long = 0 
    Dim files() As String = Directory.GetFiles(path) 
    Parallel.For(0, files.Length, 
        Sub(index As Integer) 
        Dim fi As New FileInfo(files(index)) 
        Dim size As Long = fi.Length 
        Interlocked.Add(totalSize, size) 
        End Sub) 

    If recurse Then 
     Dim subDirs() As String = Directory.GetDirectories(path) 
     Dim subTotal As Long = 0 
     Parallel.For(0, subDirs.Length, 
         Function(index As Integer) 
         If (File.GetAttributes(subDirs(index)) And FileAttributes.ReparsePoint) <> FileAttributes.ReparsePoint Then 
          Interlocked.Add(subTotal, GetDirectorySize(subDirs(index), True)) 
          Return subTotal 
         End If 
         Return 0 
         End Function) 
     Interlocked.Add(totalSize, subTotal) 
    End If 

    Return totalSize 
End Function 

Answer 5

这里这个短我能得到它。

它会在消息框中显示选定的大小。 你需要一个FolderBrowserDialog在这种形式的工作。

Class Form1 

Private Sub form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load 
    Try 
     If (FolderBrowserDialog1.ShowDialog() = DialogResult.OK) Then 
     Else : End 
     End If 
     Dim dInfo As New IO.DirectoryInfo(FolderBrowserDialog1.SelectedPath) 
     Dim sizeOfDir As Long = DirectorySize(dInfo, True) 
     MsgBox("Showing Directory size of " & FolderBrowserDialog1.SelectedPath _ 
       & vbNewLine & "Directory size in Bytes : " & "Bytes " & sizeOfDir _ 
       & vbNewLine & "Directory size in KB : " & "KB " & Math.Round(sizeOfDir/1024, 3) _ 
       & vbNewLine & "Directory size in MB : " & "MB " & Math.Round(sizeOfDir/(1024 * 1024), 3) _ 
       & vbNewLine & "Directory size in GB : " & "GB " & Math.Round(sizeOfDir/(1024 * 1024 * 1024), 3)) 
    Catch ex As Exception 
    End Try 
End Sub 

Private Function DirectorySize(ByVal dInfo As IO.DirectoryInfo, ByVal includeSubDir As Boolean) As Long 
    Dim totalSize As Long = dInfo.EnumerateFiles().Sum(Function(file) file.Length) 
    If includeSubDir Then totalSize += dInfo.EnumerateDirectories().Sum(Function(dir) DirectorySize(dir, True)) 
    Return totalSize 
End Function 

End Class 

Answer 6

尝试使用此方法在GB

Dim fso = CreateObject("Scripting.FileSystemObject") 
    Dim profile = fso.GetFolder("folder_path") 
    MsgBox(profile.Size/1073741824)