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AddPageField Throws exception
https://forum.pdfsharp.net/viewtopic.php?f=2&t=3577		 Page 1 of 1
Author:  mostafa90 [ Tue Apr 18, 2017 6:50 pm ]
Post subject:  AddPageField Throws exception
Hi,
Thank you for this great open source code. I have tried using a mix between migra and pdfsharp, and it works flawlessly till i faced the "Object reference not set to instance of object" when adding AddPageField() statement, generally adding any field to footer throughs exception.
May you please have a look on my code below and advise.

Code:
 
public static void ExportPDF(List<string> str_imgs, string ir_Header = "Inspection Request no. 355")
        {

            var doc = new PdfDocument();



            var p = doc.AddPage();
           
            p.Orientation = PdfSharp.PageOrientation.Portrait;
            p.TrimMargins.Left = "1cm";
            p.TrimMargins.Right = "1cm";
            p.TrimMargins.Top = "2cm";
            p.TrimMargins.Bottom = "2cm";

            var gfx = XGraphics.FromPdfPage(p);
            gfx.MUH = PdfFontEncoding.Unicode;
            XFont font = new XFont("Arial", 13, XFontStyle.Bold);

            gfx.DrawString("This is a test string", font, XBrushes.Blue, new XPoint(XUnit.FromMillimeter(0), XUnit.FromMillimeter(14)));

            for (int i = 0; i < str_imgs.Count; i++)
            {
                var im = XImage.FromFile(str_imgs[i]);
                var ratio = im.PointWidth / im.PointHeight;
                XUnit pic_Hloc = XUnit.FromMillimeter(15);
                string imgcap = "Image " + (i + 1).ToString("00");

                if (i > 0)
                {
                    var tim = XImage.FromFile(str_imgs[i - 1]);
                    pic_Hloc += XUnit.FromMillimeter(190) / (tim.PointWidth / tim.PointHeight) + gfx.MeasureString(imgcap, font).Height + XUnit.FromMillimeter(2);
                }
                XUnit width = XUnit.FromMillimeter(190);
                XUnit height = XUnit.FromMillimeter(190) / ratio;
                gfx.DrawImage(im, p.Width / 2 - width / 2, pic_Hloc, width, height);

                gfx.DrawString(imgcap, font, XBrushes.Black, new XPoint(width / 2 - gfx.MeasureString(imgcap, font).Width / 2, pic_Hloc + height + XUnit.FromMillimeter(5)));
            }
            Document Migdoc = new Document();

            MigraDoc.DocumentObjectModel.Section sec = Migdoc.AddSection();
            var head = sec.Headers.Primary;
            head.Format.WidowControl = true;
            sec.PageSetup.OddAndEvenPagesHeaderFooter = false;

            var para = new MigraDoc.DocumentObjectModel.Paragraph();
            para.Format.Alignment = ParagraphAlignment.Justify;
            para.Format.Borders.HasBorder(BorderType.Bottom);
            para.Format.Borders.Bottom.Width = 2;
            para.Format.Borders.Bottom.Color = Colors.Black;
            para.Format.Font.Size = 14;
            para.Format.Font.Bold = true;
            para.AddText(ir_Header);
            head.Add(para);

            var footf = sec.Footers.Primary.AddTextFrame();
            footf.Width = "21cm";
            footf.MarginBottom = 0;
            footf.Orientation = MigraDoc.DocumentObjectModel.Shapes.TextOrientation.Horizontal;
            footf.MarginTop = "2cm";

              var foot = sec.Footers.Primary;

            Migdoc.DefaultPageSetup.FooterDistance = Unit.FromMillimeter(40);
            foot.Format.Borders.HasBorder(BorderType.Top);
            foot.Format.Borders.Top.Width = 2;
            foot.Format.Borders.Top.Color = Colors.Black;

           

            MigraDoc.DocumentObjectModel.Paragraph Leftpara = sec.Footers.Primary.AddParagraph();
            Leftpara.AddText("Page ");
            Leftpara.AddPageField();             
            Leftpara.AddText("/");
            Leftpara.AddNumPagesField();
            Leftpara.Format.Font.Size = 14;
            Leftpara.Format.Alignment = ParagraphAlignment.Center;

           
            var renderer = new MigraDoc.Rendering.DocumentRenderer(Migdoc);
           
            renderer.PrepareDocument();
            renderer.RenderObject(gfx, XUnit.FromMillimeter(0), XUnit.FromMillimeter(0), p.Width, para);
            renderer.RenderObject(gfx, XUnit.FromMillimeter(0), XUnit.FromMillimeter(270), p.Width, Leftpara);//<-- Exception here
         
            string filesave = @"C:\testsample.pdf";

            try
            {
                doc.Save(filesave);
                Process.Start(filesave);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }



       

        }
Author:  mostafa90 [ Tue Apr 18, 2017 6:54 pm ]
Post subject:  AddPageField Throws exception
Hi,
Thank you for this great open source code. I have tried using a mix between migra and pdfsharp, and it works flawlessly till i faced the "Object reference not set to instance of object" when adding AddPageField() statement, generally adding any field to footer throughs exception.
May you please have a look on my code below and advise.

Code:
 
public static void ExportPDF(List<string> str_imgs, string ir_Header = "Inspection Request no. 355")
        {

            var doc = new PdfDocument();



            var p = doc.AddPage();
           
            p.Orientation = PdfSharp.PageOrientation.Portrait;
            p.TrimMargins.Left = "1cm";
            p.TrimMargins.Right = "1cm";
            p.TrimMargins.Top = "2cm";
            p.TrimMargins.Bottom = "2cm";

            var gfx = XGraphics.FromPdfPage(p);
            gfx.MUH = PdfFontEncoding.Unicode;
            XFont font = new XFont("Arial", 13, XFontStyle.Bold);

            gfx.DrawString("This is a test string", font, XBrushes.Blue, new XPoint(XUnit.FromMillimeter(0), XUnit.FromMillimeter(14)));

            for (int i = 0; i < str_imgs.Count; i++)
            {
                var im = XImage.FromFile(str_imgs[i]);
                var ratio = im.PointWidth / im.PointHeight;
                XUnit pic_Hloc = XUnit.FromMillimeter(15);
                string imgcap = "Image " + (i + 1).ToString("00");

                if (i > 0)
                {
                    var tim = XImage.FromFile(str_imgs[i - 1]);
                    pic_Hloc += XUnit.FromMillimeter(190) / (tim.PointWidth / tim.PointHeight) + gfx.MeasureString(imgcap, font).Height + XUnit.FromMillimeter(2);
                }
                XUnit width = XUnit.FromMillimeter(190);
                XUnit height = XUnit.FromMillimeter(190) / ratio;
                gfx.DrawImage(im, p.Width / 2 - width / 2, pic_Hloc, width, height);

                gfx.DrawString(imgcap, font, XBrushes.Black, new XPoint(width / 2 - gfx.MeasureString(imgcap, font).Width / 2, pic_Hloc + height + XUnit.FromMillimeter(5)));
            }
            Document Migdoc = new Document();

            MigraDoc.DocumentObjectModel.Section sec = Migdoc.AddSection();
            var head = sec.Headers.Primary;
            head.Format.WidowControl = true;
            sec.PageSetup.OddAndEvenPagesHeaderFooter = false;

            var para = new MigraDoc.DocumentObjectModel.Paragraph();
            para.Format.Alignment = ParagraphAlignment.Justify;
            para.Format.Borders.HasBorder(BorderType.Bottom);
            para.Format.Borders.Bottom.Width = 2;
            para.Format.Borders.Bottom.Color = Colors.Black;
            para.Format.Font.Size = 14;
            para.Format.Font.Bold = true;
            para.AddText(ir_Header);
            head.Add(para);

            var footf = sec.Footers.Primary.AddTextFrame();
            footf.Width = "21cm";
            footf.MarginBottom = 0;
            footf.Orientation = MigraDoc.DocumentObjectModel.Shapes.TextOrientation.Horizontal;
            footf.MarginTop = "2cm";

              var foot = sec.Footers.Primary;

            Migdoc.DefaultPageSetup.FooterDistance = Unit.FromMillimeter(40);
            foot.Format.Borders.HasBorder(BorderType.Top);
            foot.Format.Borders.Top.Width = 2;
            foot.Format.Borders.Top.Color = Colors.Black;

           

            MigraDoc.DocumentObjectModel.Paragraph Leftpara = sec.Footers.Primary.AddParagraph();
            Leftpara.AddText("Page ");
            Leftpara.AddPageField();             
            Leftpara.AddText("/");
            Leftpara.AddNumPagesField();
            Leftpara.Format.Font.Size = 14;
            Leftpara.Format.Alignment = ParagraphAlignment.Center;

           
            var renderer = new MigraDoc.Rendering.DocumentRenderer(Migdoc);
           
            renderer.PrepareDocument();
            renderer.RenderObject(gfx, XUnit.FromMillimeter(0), XUnit.FromMillimeter(0), p.Width, para);
            renderer.RenderObject(gfx, XUnit.FromMillimeter(0), XUnit.FromMillimeter(270), p.Width, Leftpara);//<-- Exception here
         
            string filesave = @"C:\testsample.pdf";

            try
            {
                doc.Save(filesave);
                Process.Start(filesave);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }



       

        }
Author:  Thomas Hoevel [ Wed Apr 19, 2017 8:40 am ]
Post subject:  Re: AddPageField Throws exception
Hi!

Your use MigraDoc in a way that will work only when the paragraphs fit on a single page. All you can get from the page fields is "1 / 1", so while it would be nice if the page fields would work, it would not give you more functionality.

Use RenderPage instead of RenderObject when there can be more than one page - and page fields work when RenderPage is used properly.
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