為了從PDF文檔中獲取PDF文件頁的注釋，一般需要依次查看指定PDF頁中的Annotations注釋集。請注意，如果你想獲得整個PDF的所有注釋，就不得不在瀏覽注釋集合之前查看文檔的Pages頁面集合。你可以以名叫MarkupAnnotation的基礎注釋類型的方式得到每個集合的所有注釋，并顯示其屬性。

》》》下載Aspose.Pdf試用版

下面是代碼示例：

C#

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

//loop through all the annotations
foreach (MarkupAnnotation annotation in pdfDocument.Pages[1].Annotations)
{

//get annotation properties
Console.WriteLine("Title : {0} ", annotation.Title);
Console.WriteLine("Subject : {0} ", annotation.Subject);
Console.WriteLine("Contents : {0} ", annotation.Contents);
Console.WriteLine("ReadOnly : {0} ", annotation.ReadOnly);
}

VB.NET

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

'loop through all the annotations
For Each annotation As MarkupAnnotation In pdfDocument.Pages(1).Annotations

'get annotation properties
Console.WriteLine("Title : {0} ", annotation.Title)
Console.WriteLine("Subject : {0} ", annotation.Subject)
Console.WriteLine("Contents : {0} ", annotation.Contents)
Console.WriteLine("ReadOnly : {0} ", annotation.ReadOnly)
Next annotation