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NRE when loading FlowDocument

See original GitHub issue

Following code throws a NRE in dotnet 7 When loading xaml that has beein previously saved, you will get a NRE . It has something to do with the Run.TextDecoration.

We ran into this issue because of a help tool we created that fails to load help pages since we upgraded to dot net 7.

       [TestMethod]
       public void ErrorOnXamlSerializeDeserialize()
        {
            string xaml = "<Section xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\" >" +
                          "<Paragraph><Run>" +
                          "<Run.TextDecorations><TextDecorationCollection xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\"><TextDecoration PenThicknessUnit=\"FontRecommended\" Location=\"Underline\"><TextDecoration.Pen><Pen Brush=\"#FF00FFFF\" Thickness=\"2\" /></TextDecoration.Pen></TextDecoration></TextDecorationCollection></Run.TextDecorations>" +
                          "xxx</Run></Paragraph></Section>";

 

            MemoryStream mems = new MemoryStream();
            mems.Write(Encoding.UTF8.GetBytes(xaml));
            mems.Position = 0;

            FlowDocument doc = new FlowDocument();

 

            TextRange all = new TextRange(doc.ContentStart, doc.ContentEnd);
            all.Load(mems, DataFormats.Xaml);

 

            MemoryStream saveStream = new MemoryStream();
            all = new TextRange(doc.ContentStart, doc.ContentEnd);
            all.Save(saveStream, DataFormats.XamlPackage);

 

            saveStream.Position = 0;
            all = new TextRange(doc.ContentStart, doc.ContentEnd);
            all.Load(saveStream, DataFormats.XamlPackage);

 

        }

Issue Analytics

State:
Created 9 months ago
Reactions:1
Comments:14 (6 by maintainers)

Top GitHub Comments

1reaction

lindexicommented, Dec 30, 2022

@IAmTheCShark See https://devblogs.microsoft.com/dotnet/dotnet-framework-december-2022-security-and-quality-rollup-updates/ and https://support.microsoft.com/kb/5022083

But I do not think the https://support.microsoft.com/kb/5022083 is related

1reaction

IAmTheCSharkcommented, Dec 29, 2022

Now some of our customers starting to report this issue on .net 4.8 versions So my guess is this might be some recent change that is distributed via windows update. @lindexi fyi

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