How to modify annotations and export it to another PDF document?
Modify annotations and export it to another PDF document
To modify annotations, iterate through the annotations present in the PdfLoadedPage and then modify the Annotation properties (Color, Border, Border style etc..) for the respective annotation type. To export into another PdfDocument, merge the PdfLoadedDocument with PdfDocument and then save it.
Assemblies Required
1)Syncfusion.Compression.Base.dll
2)Syncfusion.Pdf.Base.dll
The below code illustrates how to modify annotation and export into another PDF.
Code Snippet:
//Load the document
PdfLoadedDocument doc = new PdfLoadedDocument(“annot.pdf");
//Set the color
PdfColor color = new PdfColor(Color.Green);
//iterate through the loaded pages
foreach (PdfLoadedPage page in doc.Pages)
{
//iterate through the annotations present in respective page
foreach (var markup in page.Annotations)
{
//Check it is PdfLoadedInkAnnotation
if (markup.GetType() == typeof(PdfLoadedInkAnnotation))
{
//Load the specified annotaion
PdfLoadedInkAnnotation thisNotation = (PdfLoadedInkAnnotation)markup;
//Modifying annotation color
thisNotation.Color = color;
}
//Checks it is PdfLoadedLineAnnotation
if (markup.GetType() == typeof(PdfLoadedLineAnnotation))
{
//Load the specified annotaion
PdfLoadedLineAnnotation thisNotation = (PdfLoadedLineAnnotation)markup;
//Modifying annotation color
thisNotation.Color = color;
}
//Checks it is PdfLoadedTextMarkupAnnotation
if (markup.GetType() == typeof(PdfLoadedTextMarkupAnnotation))
{
//Load the specified annotaion
PdfLoadedTextMarkupAnnotation thisNotation = (PdfLoadedTextMarkupAnnotation)markup;
//Modifying annotation color
thisNotation.Color = color;
}
}
}
//Creates new Pdf Document
PdfDocument nwDoc = new PdfDocument();
//Merging inorder to export the pdf
PdfDocument.Merge(nwDoc,doc);
//Save the document and dispose it.
nwDoc.Save(“annotoutput.pdf");
ldoc.Close();
nwDoc.Close();
The working sample can be downloaded from the below link:
Note:
Starting with v16.2.0.x, if you reference Syncfusion® assemblies from the trial setup or the NuGet feed, include a license key in your projects. Refer to the link to learn about generating and registering the Syncfusion® license key in your application to use the components without a trial message.
Conclusion:
I hope you enjoyed learning about how to modify annotations and export it to another PDF document.
You can refer to our Flutter PDF feature tour page to learn about its other groundbreaking features and documentation, and how to quickly get started with configuration specifications. You can also explore our Flutter PDF Flutter PDF examples to understand how to create and manipulate data.
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