为方便使用者快速掌握和了解Spire.PDF，本文列举了PDF理控件Spire.pdf常见问题及解答欢迎下载最新版体验！
为方便使用者快速掌握和了解Spire.PDF，本文列举了PDF理控件Spire.pdf常见问题及解答欢迎下载最新版体验！
如何将 HTML 代码转换为 PDF/h5>
A：Spire.PDF 无法加载包含 html 代码的字符串。但是 Spire.Doc 可以加载它并且 Spire.Doc 支持 PDF 格式。所以你可以使用 Spire.Doc 来完成这项工作。完整代码：
string htmlstring = "<!DOCTYPE html><html><body><h1>Header 1</h1><p>First paragraph</p></body></html>";Document doc = new Document();Section sec = doc.AddSection();Paragraph para = sec.AddParagraph();//add html code to documentpara.AppendHTML(htmlstring);//save document as PDF formatdoc.SaveToFile("result.pdf", FileFormat.PDF);
如何在表格的单元格中嵌入另一个表格/h5>
A：表格是一个更简单的网格。在网格中，您可以操作每个单元格，为每个单元格设置不同的样式并嵌入另一个网格。所以你可以使用网格来完成这项工作。完整代码：
PdfDocument document = new PdfDocument();PdfPageBase page = document.Pages.Add(PdfPageSize.A4);PdfGrid grid = new PdfGrid();grid.Columns.Add(1);grid.Columns[0].Width = page.Canvas.ClientSize.Width;PdfGridRow row0 = grid.Rows.Add();row0.Cells[0].Value = "This is the first row.";row0.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle);PdfGridRow row1 = grid.Rows.Add();PdfLayoutResult result=grid.Draw(page, new PointF(0, 20));PdfGrid grid2 = new PdfGrid();grid2.Columns.Add(2);PdfGridRow newrow = grid2.Rows.Add();grid2.Columns[0].Width = grid.Columns[0].Width / 2;grid2.Columns[1].Width = grid.Columns[0].Width / 2;newrow.Cells[0].Value = "This is row two column one.";newrow.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle);newrow.Cells[1].Value = "This is row two column two.";newrow.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle);//assign grid2 to row1row1.Cells[0].Value = grid2;//drwa grid2result = grid2.Draw(page, new PointF(0, result.Bounds.Location.Y + result.Bounds.Height));document.SaveToFile("result.pdf");
如何合并网格中的单元格/h5>
A：Spire.PDF 为您提供名为 RowSpan 和 ColumnSpan 的属性来合并单元格。完整代码：
PdfDocument doc = new PdfDocument();PdfPageBase page = doc.Pages.Add();PdfGrid grid = new PdfGrid();grid.Columns.Add(5);float width = page.Canvas.ClientSize.Width - (grid.Columns.Count + 1);for (int i = 0; i < grid.Columns.Count; i++){grid.Columns[i].Width = width * 0.20f;}PdfGridRow row0 = grid.Rows.Add();PdfGridRow row1 = grid.Rows.Add();row0.Style.Font = new PdfTrueTypeFont(new Font("Arial", 16f, FontStyle.Bold), true);row1.Style.Font = new PdfTrueTypeFont(new Font("Arial", 16f, FontStyle.Italic), true);row0.Cells[0].Value = "Corporation";//merge with the downside cellrow0.Cells[0].RowSpan = 2;row0.Cells[1].Value = "B&K Undersea Photo";row0.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle);//merge with the right cellrow0.Cells[1].ColumnSpan = 3;row0.Cells[4].Value = "World";row0.Cells[4].Style.Font = new PdfTrueTypeFont(new Font("Arial", 10f, FontStyle.Bold | FontStyle.Italic), true);row0.Cells[4].StringFormat = new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle);row0.Cells[4].Style.BackgroundBrush = PdfBrushes.LightGreen;row1.Cells[1].Value = "Diving International Unlimited";row1.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle);row1.Cells[1].ColumnSpan = 4;grid.Draw(page, new PointF(0, 0));doc.SaveToFile("result.pdf");
如何在 PDF 文件中添加签名/h5>
A：首先，使用类 PdfCertificate 创建一个证书实例。证书实例将用于创建 PdfSignature 实例。然后使用类 PdfSignature 创建一个签名实例。并且您需要设置签名实例的属性。完整代码：
PdfDocument doc = new PdfDocument();doc.LoadFromFile("sample.pdf");PdfCertificate cert = new PdfCertificate("Demo.pfx", "e-iceblue");//add signature to every page of PDF fileforeach (PdfPageBase page in doc.Pages){PdfSignature signature = new PdfSignature(page.Document, page, cert, "demo");signature.ContactInfo = "Harry";signature.Certificated = true;signature.DocumentPermissions = PdfCertificationFlags.AllowFormFill;}doc.SaveToFile("result.pdf");
如何重新排列 PDF 文件的页面/h5>
A : 请调用 ReArrange 方法。该方法将一个 int 数组作为参数。int 数组表示页面的新顺序。完整代码：
PdfDocument document = new PdfDocument();//sample.pdf has four pagesdocument.LoadFromFile("sample.pdf");//rearrange the pages of the PDF fileint[] range = new int[] { 0, 2, 1, 3 };document.Pages.ReArrange(range);document.SaveToFile("result.pdf");
如何添加图片水印/h5>
A : Spire.PDF 不直接支持图片水印。但是您可以将图像设置为 BackgroundImage。如果图像足够大，BackgroundImage 就像图像水印一样。完整代码：
PdfDocument document = new PdfDocument();PdfPageBase page = document.Pages.Add(PdfPageSize.A4);page.Canvas.DrawString("This is a demo about image watermark!",new PdfFont(PdfFontFamily.Helvetica, 25f),new PdfSolidBrush(Color.Green),10, 40);//set image as BackgroundImage to make image watermarkImage img = Image.FromFile("scene.bmp");page.BackgroundImage = img;document.SaveToFile("result.pdf");
如何在所有页面上重复标题/h5>
A : PdfDocumentTemplate 中的内容将适用于 PDF 文件的每一页。您所要做的就是创建一个将标题添加到 PdfDocumentTemplate 的方法。然后标题将添加到每个页面。完整代码：
static void Main(string[] args){PdfDocument doc = new PdfDocument();PdfUnitConvertor unitCvtr = new PdfUnitConvertor();PdfMargins margin = new PdfMargins();margin.Top = unitCvtr.ConvertUnits(3.0f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point);margin.Bottom = margin.Top;margin.Left = unitCvtr.ConvertUnits(3.17f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point);margin.Right = margin.Left;// create three pagePdfPageBase page = doc.Pages.Add(PdfPageSize.A4, margin);page = doc.Pages.Add(PdfPageSize.A4, margin);page = doc.Pages.Add(PdfPageSize.A4, margin);//apply templateSetDocumentTemplate(doc, PdfPageSize.A4, margin);doc.SaveToFile("result.pdf");}//method to add header to every pageprivate static void SetDocumentTemplate(PdfDocument doc, SizeF pageSize, PdfMargins margin){PdfPageTemplateElement leftSpace= new PdfPageTemplateElement(margin.Left, pageSize.Height);doc.Template.Left = leftSpace;PdfPageTemplateElement topSpace= new PdfPageTemplateElement(pageSize.Width, margin.Top);topSpace.Foreground = true;doc.Template.Top = topSpace;//draw header labelPdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial", 9f, FontStyle.Italic));PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Right);String label = "Demo about Header Repeating";//set the header styleSizeF size = font.MeasureString(label, format);float y = topSpace.Height - font.Height - 40;PdfPen pen = new PdfPen(Color.Black, 0.75f);topSpace.Graphics.SetTransparency(0.5f);topSpace.Graphics.DrawLine(pen, margin.Left - 30, y, pageSize.Width - margin.Right + 30, y);y = y - 1 - size.Height;topSpace.Graphics.DrawString(label, font, PdfBrushes.Black, pageSize.Width - margin.Right, y, format);PdfPageTemplateElement rightSpace= new PdfPageTemplateElement(margin.Right, pageSize.Height);doc.Template.Right = rightSpace;PdfPageTemplateElement bottomSpace= new PdfPageTemplateElement(pageSize.Width, margin.Bottom);bottomSpace.Foreground = true;doc.Template.Bottom = bottomSpace;}
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