Hyperlink to open/download a File (Acumatica) - acumatica

Question

Is there any way to make a hyperlink to a file that will open its contents or download it from the table it belongs? (In a sense, do exactly the same thing as AllowEdit but open/download the file instead.) Example:
Where the Default Specification files are from files found on the customer:
Please note that what displays is the comment of the file. If anyone has any suggestions on how to display the file name instead, that would be appreciated as well.

Answer 1

You can get the filename like this:
UploadFileMaintenance uploadFileMaintenance = PXGraph.CreateInstance<UploadFileMaintenance>();
foreach (Guid note in PXNoteAttribute.GetFileNotes(cache, dacRecord))
{
FileInfo file = uploadFileMaintenance.GetFileWithNoData(note);
PXTrace.WriteInformation(file.Name);
}
To download the file, create a DAC field of string type. You can initialize the string to the file name in the FieldDefaulting or FieldSelecting event. Declare an Action and use the LinkCommand attribute in the ASPX file to make that field control a link.
In that Action event handler, you can redirect the browser to the file in order to download/open it:
UploadFileMaintenance uploadFileMaintenance = PXGraph.CreateInstance<UploadFileMaintenance>();
Guid[] notes = PXNoteAttribute.GetFileNotes(cache, dacRecord);
if (notes != null && notes.Length > 0)
{
FileInfo downloadFile = uploadFileMaintenance.GetFile(notes[0]);
if (downloadFile != null)
{
throw new PXRedirectToFileException(downloadFile.UID, true);
}
}