使用C#给PDF文档添加注释的示例代码分享（图）(2)-木庄网络博客

同样，给文档添加自由文本注释也相对简单。

步骤1：新建一个PDF文档对象，并添加一个新页面。

1 2	`PdfDocument doc =` `new` `PdfDocument();` `PdfPageBase page = doc.Pages.Add();`

步骤2：初始化一个PdfFreeTextAnnotation，然后自定义注释的文本。

RectangleF rect = new RectangleF(0, 40, 150, 50);
PdfFreeTextAnnotation textAnnotation = new PdfFreeTextAnnotation(rect);
textAnnotation.Text = "Free text annotation ";

步骤3：设置注释的属性，包括字体、填充颜色、边框颜色和透明度。

PdfFont font = new PdfFont(PdfFontFamily.TimesRoman, 10);
PdfAnnotationBorder border = new PdfAnnotationBorder(1f);
textAnnotation.Font = font;
textAnnotation.Border = border;
textAnnotation.BorderColor = Color. Purple;
textAnnotation.LineEndingStyle = PdfLineEndingStyle.Circle;
textAnnotation.Color = Color. Pink;
textAnnotation.Opacity = 0.8f;

步骤4：添加注释到页面。

1	`page.AnnotationsWidget.Add(textAnnotation);`

步骤5：保存并重新打开文档。

1 2	`doc.SaveToFile("FreeTextAnnotation.pdf", FileFormat.PDF);` `System.Diagnostics.Process.Start("FreeTextAnnotation.pdf");`

这是添加自由文本注释的效果图：

全部代码：

PdfDocument doc = new PdfDocument();
      PdfPageBase page = doc.Pages.Add();
       
      RectangleF rect = new RectangleF(0, 40, 150, 50);
      PdfFreeTextAnnotation textAnnotation = new PdfFreeTextAnnotation(rect);
      textAnnotation.Text = "Free text annotation ";
     
      PdfFont font = new PdfFont(PdfFontFamily.TimesRoman, 10);
      PdfAnnotationBorder border = new PdfAnnotationBorder(1f);
      textAnnotation.Font = font;
      textAnnotation.Border = border;
      textAnnotation.BorderColor = Color. Purple;
      textAnnotation.LineEndingStyle = PdfLineEndingStyle.Circle;
      textAnnotation.Color = Color.Pink;
      textAnnotation.Opacity = 0.8f;
       
      page.AnnotationsWidget.Add(textAnnotation);
      doc.SaveToFile("FreeTextAnnotation.pdf", FileFormat.PDF);
      System.Diagnostics.Process.Start("FreeTextAnnotation.pdf");