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这个地方的所说的注释包含在每个特定页的注释集中。因为每个PDF页都有自己单独的注释集，所以这个注释集也只是收录这个PDF页中的注释。要在一个PDF页中使用Aspose.Pdf添加注释，必须要使用Add方法将这个需要添加的注释添加到Annotations注释集中。所以第一步是创建一个新的注释，然后打开PDF文件，将之添加到该页的注释集中。

》》》下载Aspose.Pdf试用版

下面是具体的代码示例：

C#

//open document
Document pdfDocument = new Document("input.pdf");
//create annotation
TextAnnotation textAnnotation = new TextAnnotation(pdfDocument.Pages[1], new Aspose.Pdf.Rectangle(200, 400, 400, 600));
textAnnotation.Title = "Sample Annotation Title";
textAnnotation.Subject = "Sample Subject";
textAnnotation.State = AnnotationState.Accepted;
textAnnotation.Contents = "Sample contents for the annotation";
textAnnotation.Open = true;
textAnnotation.Icon = TextIcon.Key;
Border border = new Border(textAnnotation);
border.Width = 5;
border.Dash = new Dash(1, 1);
textAnnotation.Border = border;
textAnnotation.Rect = new Aspose.Pdf.Rectangle(200, 400, 400, 600);
//add annotation in the annotations collection of the page
pdfDocument.Pages[1].Annotations.Add(textAnnotation);
////save output file
pdfDocument.Save("output.pdf");

VB.NET

'open document
Dim pdfDocument As New Document("input.pdf")
'create annotation
Dim textAnnotation As New TextAnnotation(pdfDocument.Pages(1), New Aspose.Pdf.Rectangle(200, 400, 400, 600))
textAnnotation.Title = "Sample Annotation Title"
textAnnotation.Subject = "Sample Subject"
textAnnotation.State = AnnotationState.Accepted
textAnnotation.Contents = "Sample contents for the annotation"
textAnnotation.Open = True
textAnnotation.Icon = TextIcon.Key
Dim border As New Border(textAnnotation)
border.Width = 5
border.Dash = New Dash(1, 1)
textAnnotation.Border = border
textAnnotation.Rect = New Aspose.Pdf.Rectangle(200, 400, 400, 600)
'add annotation in the annotations collection of the page
pdfDocument.Pages(1).Annotations.Add(textAnnotation)
'//save output file
pdfDocument.Save("output.pdf")