Aspose.Pdf使用教程：获取PDF文档中的所有注释

为了从PDF文档中获取PDF文件页的注释，一般需要依次查看指定PDF页中的Annotations注释集。请注意，如果你想获得整个PDF的所有注释，就不得不在浏览注释集合之前查看文档的Pages页面集合。你可以以名叫MarkupAnnotation的基础注释类型的方式得到每个集合的所有注释，并显示其属性。

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下面是代码示例：

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