Colors from a PdfTextField are not stored

[BigDi]

I try to modify an existed PDF. The foreground and background should set to white. I iterate to all form elements and identify the right one. Then I cast it to PdfTextField. Then I assign BackColor and ForeColor but it will not be saved to the file. When I opened the new file the colors are not set.

string file = @"C:\temp\doc.pdf";
string file2 = @"C:\temp\output.pdf";
PdfDocument pdfDoc = PdfReader.Open(file, PdfDocumentOpenMode.Modify);
PdfAcroForm form = pdfDoc.AcroForm;
for (int i = 0; i < pdfDoc.AcroForm.Fields.Count; i++)
{
var item = pdfDoc.AcroForm.Fields[i];
string itemName = item.Name;
if (itemName == "Text1")
  {
    PdfTextField textField = (PdfTextField)item;
    textField.BackColor = XColors.White;
    textField.ForeColor = XColors.White;
  }
}
pdfDoc.Save(file2);
pdfDoc.Close();

doc.pdf

[ThomasHoevel]

Changing the properties of a PdfTextField does not change the representation of this field in the PDF file. This is by design.

It is up to your code to change the representation of the field.

[BigDi]

Okay, do you have an example how to update a representation?