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GroupDocs.Annotation allows you to update annotations by specifying their Id properties. Also you can update annotations by providing a collection of updated annotation objects that replaces all existing document annotations.
To update annotations, follow these steps:
- Instantiate the Annotator class. Specify the input document path or stream.
- Create an AnnotationBase implementation and set Id of existed annotation (if annotation with that Id is not found, it is ignored) or path list of annotations (all existed annotations are removed).
- Call the Update method of the Annotator class. Specify annotations.
- Call the Save method. Specify the output document path or stream.
The following code demonstrates how to update annotations:
using (Annotator annotator = new Annotator("input.pdf"))
{
AreaAnnotation original = new AreaAnnotation
{
Id = 1,
BackgroundColor = 65535,
Box = new Rectangle(100, 100, 100, 100),
CreatedOn = DateTime.Now,
Message = "This is original annotation",
Replies = new List<Reply>
{
new Reply
{
Comment = "Original first comment",
RepliedOn = DateTime.Now
},
new Reply
{
Comment = "Original second comment",
RepliedOn = DateTime.Now
}
}
};
// add original annotation
annotator.Add(original);
annotator.Save("result.pdf");
}
// open annotated document
using (Annotator annotator = new Annotator("result.pdf"))
{
//assuming we are going to change some properties of existing annotation
AreaAnnotation updated = new AreaAnnotation
{
// It's important to set existed annotation Id
Id = 1,
BackgroundColor = 255,
Box = new Rectangle(0, 0, 50, 200),
CreatedOn = DateTime.Now,
Message = "This is updated annotation",
Replies = new List<Reply>
{
new Reply
{
Comment = "Updated first comment",
RepliedOn = DateTime.Now
},
new Reply
{
Comment = "Updated second comment",
RepliedOn = DateTime.Now
}
}
};
// update annotation
annotator.Update(updated);
annotator.Save("result.pdf");
}
You can also update annotation using Id. You can also pass the list of annotations. In that case all previous annotations will be replaced by new list.
To do this, follow these steps:
- Instantiate the Annotator class. Specify the input document path or stream.
- Create an AnnotationBase implementation and set Id of existed annotation (if annotation with that Id is not found, it is ignored) or path list of annotations (all existed annotations will be removed).
- Call the Update method of the Annotator class. Specify annotations.
- Call the Save method. Specify the output document path or stream.
The following code demonstrates how to update annotations using Id:
using (Annotator annotator = new Annotator("input.pdf"))
{
AreaAnnotation original = new AreaAnnotation
{
Id = 1,
BackgroundColor = 65535,
Box = new Rectangle(100, 100, 100, 100),
CreatedOn = DateTime.Now,
Message = "This is original annotation",
Replies = new List<Reply>
{
new Reply
{
Comment = "Original first comment",
RepliedOn = DateTime.Now
},
new Reply
{
Comment = "Original second comment",
RepliedOn = DateTime.Now
}
}
};
// add original annotation
annotator.Add(original);
annotator.Save("result.pdf");
}
// open annotated document
using (Annotator annotator = new Annotator("result.pdf"))
{
//assuming we are going to change some properties of existing annotation
AreaAnnotation updated = new AreaAnnotation
{
// It's important to set existed annotation Id
Id = 1,
BackgroundColor = 255,
Box = new Rectangle(0, 0, 50, 200),
CreatedOn = DateTime.Now,
Message = "This is updated annotation",
Replies = new List<Reply>
{
new Reply
{
Comment = "Updated first comment",
RepliedOn = DateTime.Now
},
new Reply
{
Comment = "Updated second comment",
RepliedOn = DateTime.Now
}
}
};
// update annotation
annotator.Update(updated);
annotator.Save("result.pdf");
}
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