There are both MVVM and XAML solutions to your problem. Note that in order to read a document from a remote stream, the stream must support Read and Seek operations.
The XAML only solution requires setting the DocumentSource property of the RadPdfViewer to the URI which points to the stream of the document.
I'm attaching a sample project, which demonstrates the MVVM approach. In the path variable in MainPage.xaml.cs you need to set the path to the stream.
I hope this is helpful. Please, do not hesitate to contact us if you have any other questions.
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