我正在尝试制作一个vb.net应用程序，旨在同时将一个文件复制到多个位置。但我无法弄清楚如何阻止我收到的Dim parts As String() = targ.Split(New Char() {"\"c})
Dim filename As String = parts(parts.Count - 1) 'target folder name
Dim dir_path As String = "" 'directory without target folder name
Dim FolderList As New List(Of String)
Dim copied As Integer = 0<
For f As Integer = 0 To parts.Count - 2
dir_path += parts(f) + "\"
Next
Dim counter As Integer = IO.Directory.GetFiles(targ, "*.*", IO.SearchOption.AllDirectories).Length 'counts the number of files
newitm.SubItems(4).Text = "Copied (0/" + counter.ToString + ")" 'displays the amount of copied files
FolderList.Add(targ) 'Set first folder
Do While True
Dim FoldersInsideDirectory As New List(Of String)
If FolderList.Count = 0 Then
Exit Do 'If there is no folder to copy Exit Do
Else
For l As Integer = 0 To FolderList.Count - 1
Dim fileSystemInfo As System.IO.FileSystemInfo
Dim sourceDirectoryInfo As New System.IO.DirectoryInfo(FolderList(l))
Dim dest As String = FolderList(l).Replace(dir_path, "")
If (Not System.IO.Directory.Exists(des + "\" + dest)) Then 'create subFolder inside directory
System.IO.Directory.CreateDirectory(des + "\" + dest)
End If
For Each fileSystemInfo In sourceDirectoryInfo.GetFileSystemInfos
Dim destinationFileName As String = System.IO.Path.Combine(des + "\" + dest, fileSystemInfo.Name)
If TypeOf fileSystemInfo Is System.IO.FileInfo Then
Dim streamRead As New System.IO.FileStream(fileSystemInfo.FullName, System.IO.FileMode.Open)
Dim streamWrite As New System.IO.FileStream(des + "\" + dest + "\" + fileSystemInfo.Name, IO.FileMode.Create, IO.FileAccess.Write, IO.FileShare.None)
Dim lngLen As Long = streamRead.Length - 1
newitm.SubItems(3).Text = "Copy bytes : (0/" + (lngLen * 100).ToString + ")"
Dim byteBuffer(1048576) As Byte 'our stream buffer
Dim intBytesRead As Integer 'number of bytes read
While streamRead.Position < lngLen 'keep streaming until EOF
newitm.SubItems(3).Text = "Copy bytes : (" + CInt(streamRead.Position).ToString + "/" + (lngLen * 100).ToString + ")"
intBytesRead = (streamRead.Read(byteBuffer, 0, 1048576))
streamWrite.Write(byteBuffer, 0, intBytesRead)
streamRead.Flush()
End While
'Clean up
streamWrite.Flush()
streamWrite.Close()
streamRead.Close()
copied += 1
newitm.SubItems(4).Text = "Copied (" + copied.ToString + "/" + counter.ToString + ")"
Else
FoldersInsideDirectory.Add(fileSystemInfo.FullName)
End If
Next
Next
FolderList.Clear()
FolderList = FoldersInsideDirectory
End If
MsgBox("Done")
Loop
，因为多个线程正在尝试访问该文件。这是我目前的代码：
{{1}}
答案 0 :(得分：1)
您需要在FileShare.Read中指定FileStream's constructor：
<强>读取
允许随后打开文件进行阅读。如果未指定此标志，则在文件关闭之前，任何打开文件以供阅读（ 此过程或其他进程 ）的请求都将失败。
Dim streamRead As New System.IO.FileStream(fileSystemInfo.FullName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read)