Get USB Info with impersonation is not working

Question

Get USB Info with impersonation is not working

Dani_S 4,461

Hi,

Without impersonation I get USB info.

With impersonation is not working.

I'm using .NET 9 , MAUI on windows.

I got driver is not ready!!! Can you please help ?

My code with impersonation is :

            `if (LoginConfigurations.GetInstance().IsUserDeviceControl &&`
````                  SelectedSourceDriveItem.DriveInfoValue.DriveType == DriveType.Removable)`

`                {`

`                    var drive = SelectedSourceDriveItem?.DriveInfoValue;`

`                    UsbInfoMessage = string.Empty;`

`                    if (drive.IsReady)`

`                    {`

`#if WINDOWS`

`                        WindowsIdentity.RunImpersonated(`

`                     ImpersonationHelper.Token,`

`                            () =>`

`                            {`

`                                string driveLetterName = drive.Name;`

`                                string driveFormat = drive.DriveFormat;`

`                                string driveType = drive.DriveType.ToString();`

`                                string volumeName = string.IsNullOrEmpty(drive.VolumeLabel) ? "No Label" : drive.VolumeLabel;`

`                                long totalSize = drive.TotalSize;`

`                                long freeSpace = drive.TotalFreeSpace;`

`                                long usedSpace = totalSize - freeSpace;`

`                                StringBuilder stringBuilder = new StringBuilder();`

`                                stringBuilder.AppendLine($"Drive Name: {driveLetterName}");`

`                                stringBuilder.AppendLine($"Drive Type: {driveFormat}");`

`                                stringBuilder.AppendLine($"File System: {driveType}");`

`                                stringBuilder.AppendLine($"Volume Label: {volumeName}");`

`                                stringBuilder.AppendLine($"Total Size: {FormatBytes(totalSize)}");`

`                                stringBuilder.AppendLine($"Used Space: {FormatBytes(usedSpace)}");`

`                                stringBuilder.AppendLine($"Free Space: {FormatBytes(freeSpace)}");`

`                                UsbInfoMessage = stringBuilder.ToString();`

`                                PopupBorderColor = Color.FromRgb(255, 255, 0);`

`                                IsOpenUsbInfoPopup = true;`

`                            });`

`#endif`

`                    }`

`                    else`

`                    {`

`                        IsBusyBusyIndicator = false;`

`                        IsOpenPopup = true;`

`                        PopupBorderColor = Color.FromRgb(255, 0, 0);`

`                        ErrorMessage = $"Get USB info does not succeed.";`

`                        _logger.Error(ErrorMessage + " Since usb is not ready");`

`                    }`

`                }`

2 answers

Your answer

Answer 1

Bruce (SqlWork.com) 75,051

it is probably a mapped drive (user mounted to drive letter). the mapping by drive letter is only available to the account that mapped it. an impersonation account must use the UNC path.

Dani_S 4,461 Reputation points

2025-04-22T18:05:33.3666667+00:00

Can you please traslate to code?
Dani_S 4,461 Reputation points

2025-04-22T19:36:11.0033333+00:00

......

Answer 2

This code is work.

            if (LoginConfigurations.GetInstance().IsUserDeviceControl &&

              SelectedSourceDriveItem.DriveInfoValue.DriveType == DriveType.Removable)

            {

                var driveInfo = SelectedSourceDriveItem?.DriveInfoValue;

                UsbInfoMessage = string.Empty;

#if WINDOWS

                WindowsIdentity.RunImpersonated(

             ImpersonationHelper.Token,

                    () =>

                    {

                        var searcher = new ManagementObjectSearcher("SELECT * FROM Win32_LogicalDisk WHERE DriveType = 2"); // 2 = Removable

                       foreach (ManagementObject drive in searcher.Get())

                {

                    var letter = drive["DeviceID"];

                    if(letter.ToString() != driveInfo.Name.TrimEnd('\\'))

                    {

                        continue;

                    }

                    var totalSize = Convert.ToInt64(drive["Size"]);

                    var freeSpace = Convert.ToInt64(drive["FreeSpace"]);

                    long usedSpace = totalSize - freeSpace;

                    StringBuilder stringBuilder = new StringBuilder();

                    stringBuilder.AppendLine($"Drive Name: {letter.ToString()}");

                    stringBuilder.AppendLine($"File System: {drive["FileSystem"].ToString()}");

                    stringBuilder.AppendLine($"Total Size: {FormatBytes(totalSize)}");

                    stringBuilder.AppendLine($"Used Space: {FormatBytes(usedSpace)}");

                    stringBuilder.AppendLine($"Free Space: {FormatBytes(freeSpace)}");

                    UsbInfoMessage = stringBuilder.ToString();

                    PopupBorderColor = Color.FromRgb(255, 255, 0);

                    IsOpenUsbInfoPopup = true;

                  

                }

                    });

#endif

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Get USB Info with impersonation is not working

2 answers

Your answer