[Bug] RadSaveFileDialog

[Camille]

Hi,

Using SaveFileDialog (not RadSaveFileDialog) in Telerik apps is broken.

I'm using the [STAThread] attribute on my Program.cs.

When running my app in Debug mode , I get the following exception when ShowDialog is called  :

   à System.Windows.Forms.FileDialog.RunDialog(IntPtr hWndOwner)

   à System.Windows.Forms.CommonDialog.ShowDialog(IWin32Window owner)
   à NDC.WinUI.Helpers.WinDbFileHelper.<ExportDB>d__4.MoveNext()

When trying the same in Release mode, my app simply freezes and does nothing.

Here is my code :

public static async Task<bool> ExportDB(string dbPath)
{
    try
    {
        if(File.Exists(dbPath))
        {
            List<DriveInfo> usbDrives = DriveInfo.GetDrives().Where(drive => drive.DriveType == DriveType.Removable && drive.IsReady).ToList();

            using(SaveFileDialog sfd = new SaveFileDialog()
            {
                DefaultExt = NdcConstants.SqLiteExtension.ExtensionFilter,
                InitialDirectory = usbDrives.Count != 0 ? usbDrives[0].RootDirectory.FullName : Environment.GetFolderPath(Environment.SpecialFolder.Desktop),
                Filter = NdcConstants.SqLiteExtension.FriendlyName,
                FileName = Path.GetFileName(dbPath),
                RestoreDirectory = true
            })
            {

                if(sfd.ShowDialog() == DialogResult.OK)
                {
                    if(File.Exists(sfd.FileName))
                    {
                        File.Delete(sfd.FileName);
                    }

                    await SqlFileBackup.ProcessOnlineBackup(dbPath, sfd.FileName);
                    return true;
                }
            }
        }

        return false;
    }
    catch(Exception ex)
    {
        Interaction.Error(ex);
        return false;
    }
}

Which is call like this : await WinDbFileHelper.ExportDB(settings.LocalDatabaseFullPath)

Base .Net SDK Dialog class should be able to work even if called inside a Telerik app/form.

[Camille]

The ticket title should be SaveFileDialog, my apologies

[Dinko | Tech Support Engineer]

Hello Camille,

Thank you for clarifying that you are using the standard SaveFileDialog within a Telerik UI for WinForms application. The standard dialog should work correctly in this context, and Telerik controls do not interfere with its basic operation. To be honest, I am not sure how any of the Telerik controls could potentially break the SaveFileDialog. 

As far as I am aware, the MS SaveFileDialog (along with the rest of the file dialogs) should be called on the UI thread. You can check this StackOverflow thread where this was discussed: SaveFileDialog doesn't show in new thread? There are a couple of suggestions in the comments section. You can try them and see if they work for you.

Regards,
Dinko | Tech Support Engineer
Progress Telerik