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show RTF string in silverlight 4

Posted on 2010-08-12
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i have an RTF string coming from a web service into a silverlight 4 application, RTF example begins like:
{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fo......

I want to show this information in a richtextbox or some silverlight control , and i would like the information to look readable like the rendered RTF should be (not looking like above!)

keep in mind silverlight cannot access the system.windows.documents API

if it's not possible then i could consider solutions where the web service code which is ASP.NET fw4 converts the rtf string to xaml?  which i also dont know how to do.

thanks
josh

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Question by:joshmiller
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apeter earned 2000 total points
ID: 33436584
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by:joshmiller
ID: 33447690
yes, that got me on the right track, thanks...

i ended up making a web service / service ref that uses the code below to return an xaml string.  The xaml string is used by the silverlight app to populate a richtextbox. its sort of a hack, but it works for me.
 note: i did have to change the replace("margin function to work with the default margins for the RTF docs.  In this way my solution is weak, it will break if you have different margins, still it works for my needs.


Private Function RTFtoXAML() As String

        Dim xaml As String = ""
        Dim doc As New FlowDocument()
        Dim range As New TextRange(doc.ContentStart, doc.ContentEnd)

        Using ms As New MemoryStream()
            Using sw As New StreamWriter(ms)
                sw.Write(sw)
                sw.Flush()
                ms.Seek(0, SeekOrigin.Begin)
                range.Load(ms, System.Windows.DataFormats.Rtf)
            End Using
        End Using


        Using ms As New MemoryStream()
            range = New TextRange(doc.ContentStart, doc.ContentEnd)

            range.Save(ms, System.Windows.DataFormats.Xaml)
            ms.Seek(0, SeekOrigin.Begin)
            Using sr As New StreamReader(ms)
                xaml = sr.ReadToEnd()
            End Using
        End Using

        ' remove all attribuites in section and remove attribute margin  

        Dim start As Integer = xaml.IndexOf("<Section")
        Dim [stop] As Integer = xaml.IndexOf(">") + 1

        Dim section As String = xaml.Substring(start, [stop])

        xaml = xaml.Replace(section, "<Section xml:space=""preserve"" HasTrailingParagraphBreakOnPaste=""False"" xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation"">")
        xaml = xaml.Replace("Margin=""0,0,0,0""", [String].Empty)

        Return xaml

    End Function

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Author Closing Comment

by:joshmiller
ID: 33447696
thanks
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