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Spire.PDF常見問題解答
為方便使用者快速掌握和了解Spire.PDF，本文列舉了PDF理控件Spire.pdf常見問題及解答歡迎下載最新版體驗！
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如何將 HTML 代碼轉換為 PDF？
A：Spire.PDF 無法加載包含 html 代碼的字符串。但是 Spire.Doc 可以加載它并且 Spire.Doc 支持 PDF 格式。所以你可以使用 Spire.Doc 來完成這項工作。完整代碼：
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 document
para.AppendHTML(htmlstring);
//save document as PDF format
doc.SaveToFile("result.pdf", FileFormat.PDF);
如何在表格的單元格中嵌入另一個表格？
A：表格是一個更簡單的網格。在網格中，您可以操作每個單元格，為每個單元格設置不同的樣式并嵌入另一個網格。所以你可以使用網格來完成這項工作。完整代碼：
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 row1
row1.Cells[0].Value = grid2;
//drwa grid2
result = grid2.Draw(page, new PointF(0, result.Bounds.Location.Y + result.Bounds.Height));
document.SaveToFile("result.pdf");
如何合并網格中的單元格？
A：Spire.PDF 為您提供名為 RowSpan 和 ColumnSpan 的屬性來合并單元格。完整代碼：
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 cell
row0.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 cell
row0.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 文件中添加簽名？
A：首先，使用類 PdfCertificate 創建一個證書實例。證書實例將用于創建 PdfSignature 實例。然后使用類 PdfSignature 創建一個簽名實例。并且您需要設置簽名實例的屬性。完整代碼：
PdfDocument doc = new PdfDocument();
doc.LoadFromFile("sample.pdf");
PdfCertificate cert = new PdfCertificate("Demo.pfx", "e-iceblue");
//add signature to every page of PDF file
foreach (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 文件的頁面？
A : 請調用 ReArrange 方法。該方法將一個 int 數組作為參數。int 數組表示頁面的新順序。完整代碼：
PdfDocument document = new PdfDocument();
//sample.pdf has four pages
document.LoadFromFile("sample.pdf");
//rearrange the pages of the PDF file
int[] range = new int[] { 0, 2, 1, 3 };
document.Pages.ReArrange(range);
document.SaveToFile("result.pdf");
如何添加圖片水印？
A : Spire.PDF 不直接支持圖片水印。但是您可以將圖像設置為 BackgroundImage。如果圖像足夠大，BackgroundImage 就像圖像水印一樣。完整代碼：
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 watermark
Image img = Image.FromFile("scene.bmp");
page.BackgroundImage = img;
document.SaveToFile("result.pdf");
如何在所有頁面上重復標題？
A : PdfDocumentTemplate 中的內容將適用于 PDF 文件的每一頁。您所要做的就是創建一個將標題添加到 PdfDocumentTemplate 的方法。然后標題將添加到每個頁面。完整代碼：
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 page
PdfPageBase page = doc.Pages.Add(PdfPageSize.A4, margin);
page = doc.Pages.Add(PdfPageSize.A4, margin);
page = doc.Pages.Add(PdfPageSize.A4, margin);
//apply template
SetDocumentTemplate(doc, PdfPageSize.A4, margin);
doc.SaveToFile("result.pdf");
}
//method to add header to every page
private 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 label
PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial", 9f, FontStyle.Italic));
PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Right);
String label = "Demo about Header Repeating";
//set the header style
SizeF 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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