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PDF每页的注释都可以在该页的注释集合中找到，如果要找到某一个特定的注释，就必须先为该注释制定一个索引。

》》》下载Aspose.Pdf试用版

下面的代码片段显示了你如何获得一个特定的注释和它的属性：

C#

//open document
Document pdfDocument = new Document("input.pdf");

//get particular annotation
TextAnnotation textAnnotation = (TextAnnotation)pdfDocument.Pages[1].Annotations[1];
//get annotation properties
Console.WriteLine("Title : {0} ", textAnnotation.Title);
Console.WriteLine("Subject : {0} ", textAnnotation.Subject);
Console.WriteLine("Contents : {0} ", textAnnotation.Contents);

VB.NET

'open document
Dim pdfDocument As New Document("input.pdf")

'get particular annotation
Dim textAnnotation As TextAnnotation = CType(pdfDocument.Pages(1).Annotations(1), TextAnnotation)
'get annotation properties
Console.WriteLine("Title : {0} ", textAnnotation.Title)
Console.WriteLine("Subject : {0} ", textAnnotation.Subject)
Console.WriteLine("Contents : {0} ", textAnnotation.Contents)