XpsSignatureDefinition.SpotLocation - 它是如何工作的？

Question

SpotLocation 如何工作？以下代码不会在现场固定页面上显示数字签名请求（DSR）。 DSR 是否应该自动出现在页面上的特定位置，还是我必须定义签名图片、文本和按钮并将其放置在 xps 页面上？

...
XpsSignatureDefinition newSign = new XpsSignatureDefinition();
newSign.Intent = "I am the author of this document.";
newSign.RequestedSigner = "Jonnie ";
newSign.SigningLocale = "Richmond";

newSign.SpotLocation = new SpotLocation();
newSign.SpotLocation.PageUri 
    = PackUriHelper.CreatePartUri(new Uri(@"/Documents/1/Pages/1.fpage",UriKind.Relative));
newSign.SpotLocation.StartX = 30.00;
newSign.SpotLocation.StartY = 30.00;

newSign.SignBy = DateTime.Now + new TimeSpan(10, 0, 0, 0);
Guid g = System.Guid.NewGuid();
newSign.SpotId = g;

XpsDocument document = new XpsDocument(package);
IXpsFixedDocumentSequenceReader docSeqReader = document.FixedDocumentSequenceReader;

docSeqReader.FixedDocuments[0].AddSignatureDefinition(newSign);
docSeqReader.FixedDocuments[0].CommitSignatureDefinition();
....

Answer 1

Microsoft 的XPS Viewer 不支持将签名请求放置在特定位置（例如，由点ID 指定的位置）。