iTextSharp.text.pdf.PdfDictionary.GetAsNumber C# (CSharp) Method

        public PdfNumber GetAsNumber(PdfName key)
        {
            PdfNumber number = null;
            PdfObject orig = GetDirectObject(key);
            if (orig != null && orig.IsNumber())
                number = (PdfNumber) orig;
            return number;
        }

        private void FillFontDesc(PdfDictionary fontDesc)
        {
            if (fontDesc == null)
            {
                return;
            }
            PdfNumber v = fontDesc.GetAsNumber(PdfName.ASCENT);

            if (v != null)
            {
                Ascender = v.FloatValue;
            }
            v = fontDesc.GetAsNumber(PdfName.CAPHEIGHT);
            if (v != null)
            {
                CapHeight = v.FloatValue;
            }
            v = fontDesc.GetAsNumber(PdfName.DESCENT);
            if (v != null)
            {
                Descender = v.FloatValue;
            }
            v = fontDesc.GetAsNumber(PdfName.ITALICANGLE);
            if (v != null)
            {
                ItalicAngle = v.FloatValue;
            }
            PdfArray bbox = fontDesc.GetAsArray(PdfName.FONTBBOX);

            if (bbox != null)
            {
                llx = bbox.GetAsNumber(0).FloatValue;
                lly = bbox.GetAsNumber(1).FloatValue;
                urx = bbox.GetAsNumber(2).FloatValue;
                ury = bbox.GetAsNumber(3).FloatValue;
                if (llx > urx)
                {
                    float t = llx;
                    llx = urx;
                    urx = t;
                }
                if (lly > ury)
                {
                    float t = lly;
                    lly = ury;
                    ury = t;
                }
            }
        }