FileSystem.GetFiles() + UnauthorizedAccessException error?
- by OverTheRainbow
Hello,
It seems like FileSystem.GetFiles() is unable to recover from the UnauthorizedAccessException exception that .Net triggers when trying to access an off-limit directory.
In this case, does it mean this class/method isn't useful when scanning a whole drive and I should use some other solution (in which case: Which one?)?
Here's some code to show the issue:
Private Sub bgrLongProcess_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork
Dim drive As DriveInfo
Dim filelist As Collections.ObjectModel.ReadOnlyCollection(Of String)
Dim filepath As String
'Scan all fixed-drives for MyFiles.*
For Each drive In DriveInfo.GetDrives()
If drive.DriveType = DriveType.Fixed Then
Try
'How to handle "Access to the path 'C:\System Volume Information' is denied." error?
filelist = My.Computer.FileSystem.GetFiles(drive.ToString, FileIO.SearchOption.SearchAllSubDirectories, "MyFiles.*")
For Each filepath In filelist
DataGridView1.Rows.Add(filepath.ToString, "temp")
'Trigger ProgressChanged() event
bgrLongProcess.ReportProgress(0, filepath)
Next filepath
Catch Ex As UnauthorizedAccessException
'How to ignore this directory and move on?
End Try
End If
Next drive
End Sub
Thank you.
Edit: What about using a Try/Catch just to have GetFiles() fill the array, ignore the exception and just resume?
Private Sub bgrLongProcess_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork
'Do lengthy stuff here
Dim filelist As Collections.ObjectModel.ReadOnlyCollection(Of String)
Dim filepath As String
filelist = Nothing
Try
filelist = My.Computer.FileSystem.GetFiles("C:\", FileIO.SearchOption.SearchAllSubDirectories, "MyFiles.*")
Catch ex As UnauthorizedAccessException
'How to just ignore this off-limit directory and resume searching?
End Try
'Object reference not set to an instance of an object
For Each filepath In filelist
bgrLongProcess.ReportProgress(0, filepath)
Next filepath
End Sub
