【教程】PDF组件Spire.PDF 教程：如何在C＃，VB.NET中将HTML样式化文本插入PDF

Spire.PDF支持通过使用PdfHTMLTextElement类在PDF文档中呈现简单的HTML字符串。该类支持一组基本的HTML标签，包括Font，B，I，U，Sub，Sup和BR。对于使用CSS的复杂HTML呈现，请检查将HTML字符串转换为PDF。

详细步骤：

Step 1: 创建一个新的PDF文档，添加一个页面。

PdfDocument doc = new PdfDocument();
PdfNewPage page = doc.Pages.Add() as PdfNewPage;

Step 2: 定义HTML字符串。

string htmlText= "This demo shows how we can insert <u><i>HTML styled text</i></u> to PDF using "
                 + "<font color='#FF4500'>Spire.PDF for .NET</font>. ";

Step 3: 渲染HTML文本。

PdfFont font = new PdfFont(PdfFontFamily.Helvetica, 5);
PdfBrush brush = PdfBrushes.Black;
PdfHTMLTextElement richTextElement = new PdfHTMLTextElement(htmlText, font, brush);
richTextElement.TextAlign = TextAlign.Left;

Step 4: 格式化页面布局，以使HTML文本在内容超过一页时会分解成多个页面。

PdfMetafileLayoutFormat format = new PdfMetafileLayoutFormat();
format.Layout = PdfLayoutType.Paginate;
format.Break = PdfLayoutBreakType.FitPage;

Step 5: 在页面上绘制HTML字符串。

richTextElement.Draw(page, new RectangleF(0, 20, page.GetClientSize().Width, page.GetClientSize().Height), format);

Step 6: 保存文档。

doc.SaveToFile("Output.pdf");

输出：

完整代码：

[C#]

//Create a Pdf document
PdfDocument doc = new PdfDocument();

//Add a new page
PdfNewPage page = doc.Pages.Add() as PdfNewPage;

//HTML string
string htmlText= "This demo shows how we can insert <u><i>HTML styled text</i></u> to PDF using "
                 + "<font color='#FF4500'>Spire.PDF for .NET</font>. ";

//Render HTML text
PdfFont font = new PdfFont(PdfFontFamily.Helvetica, 5);
PdfBrush brush = PdfBrushes.Black;
PdfHTMLTextElement richTextElement = new PdfHTMLTextElement(htmlText, font, brush);
richTextElement.TextAlign = TextAlign.Left;

//Format Layout
PdfMetafileLayoutFormat format = new PdfMetafileLayoutFormat();
format.Layout = PdfLayoutType.Paginate;
format.Break = PdfLayoutBreakType.FitPage;

//Draw htmlString 
richTextElement.Draw(page, new RectangleF(0, 20, page.GetClientSize().Width, page.GetClientSize().Height), format);
doc.SaveToFile("Output.pdf");

[VB.NET]

'Create a Pdf document
Dim doc As New PdfDocument()

'Add a new page
Dim page As PdfNewPage = TryCast(doc.Pages.Add(), PdfNewPage)

'HTML string
Dim htmlText As String = "This demo shows how we can insert <u><i>HTML styled text</i></u> to PDF using "
    & "<font color='#FF4500'>Spire.PDF for .NET</font>. "

'Render HTML text
Dim font As New PdfFont(PdfFontFamily.Helvetica, 5)
Dim brush As PdfBrush = PdfBrushes.Black
Dim richTextElement As New PdfHTMLTextElement(htmlText, font, brush)
richTextElement.TextAlign = TextAlign.Left

'Format Layout
Dim format As New PdfMetafileLayoutFormat()
format.Layout = PdfLayoutType.Paginate
format.Break = PdfLayoutBreakType.FitPage

'Draw htmlString 
richTextElement.Draw(page, New RectangleF(0, 20, page.GetClientSize().Width, page.GetClientSize().Height), format)
doc.SaveToFile("Output.pdf")

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