Field name returns string.Empty when signature reason contains Japanese characters

[muramatsu-t621]

Hi,
I'm using Pdfsharp 6.2.4.

I want to use the Names property at

PDFsharp/src/foundation/src/PDFsharp/src/PdfSharp/Pdf.AcroForms/PdfAcroField.cs

Line 281 in 9c3863a

public string[] Names

to get the field names from a PdfDocument, but when the signature reason or other details in the target signature field contain Japanese characters, the field name is retrieved as string.Empty.

Thanks for your support.

[ThomasHoevel]

Hi!
Thanks for your feedback.
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