Why does setFieldProperty return false?

Question

My code sets text into the fields no problem, but when I try to change the font it returns false. I tried some other field properties, like text size with the same result. What am I doing wrong?

public string Build()
    {
        Font font = FontFactory.GetFont(FontFactory.COURIER, 8f, Font.BOLD);
        foreach (var i in this.pdfFields)
        {
            bool worked = this.acroFields.SetFieldProperty(i.Name, "textfont", font.BaseFont, null);
            worked = this.acroFields.SetField(i.Name, i.Value);
        }//foreach

        this.pdfStamper.FormFlattening = false;
        this.pdfStamper.Close();

        return this.newFile;
    }//Build

Addendum

    private string templateFile;
    private string newFile;

    private PdfReader pdfReader;
    private PdfStamper pdfStamper;
    private AcroFields acroFields;
    private List<PDFField> pdfFields;

    public PDFer(string templateFile, string newFile)
    {
        this.templateFile = templateFile;
        this.newFile = newFile;

        this.pdfReader = new PdfReader(this.templateFile);
        this.pdfStamper = new PdfStamper(pdfReader, new FileStream(this.newFile, FileMode.Create));
        this.acroFields = pdfStamper.AcroFields;

        this.pdfFields = new List<PDFField>();
    }//PDFer

    public void AddTextField(string name, string value)
    {
        this.pdfFields.Add(new PDFTextField(name, value));
    }//AddTextField

    public void AddCheckBox(string name, bool isChecked)
    {
        this.pdfFields.Add(new PDFCheckBox(name, isChecked));
    }//AddCheckBox

    public float getWidth(string s)
    {
        Chunk c = new Chunk(s);
        return c.GetWidthPoint();
    }//getWidth

Answer 1

When you set the text size, the value needs to be a Float value. If it's an int, you're using the wrong method. When you set the font, you need a real BaseFont object. I think your font.BaseFont is null. I'd create the BaseFont like this:

BaseFont.CreateFont(BaseFont.COURIER, BaseFont.WINANSI, BaseFont.EMBEDDED);

Note that EMBEDDED will be ignored as COURIER is one of the Standard Type 1 fonts.