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Crash when net35 dll used within SSRS, when certain markup is used #348

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opened 2026-01-29 14:34:23 +00:00 by claunia · 0 comments
claunia commented 2026-01-29 14:34:23 +00:00
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Originally created by @amonroejj on GitHub (Feb 6, 2020).

Using 0.18.1.0 that I compiled locally in Visual Studio 2019 Professional.

Within an SSRS report:

If I feed # Contact = Dummy (heading) to Markdig, I correctly get <h1>Contact = Dummy</h1> (and if I enable HTML for this placeholder in the report, it correctly displays as a header.)

If I feed * Contact = Dummy (bullet list) to Markdig, I get this exception:

Attempt by method 'Markdig.Helpers.DefaultObjectCache`1<System.__Canon>.NewInstance()' to access method 'Markdig.Parsers.MarkdownParser +ContainerItem..ctor()' failed.   

at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)   
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)   
at System.Activator.CreateInstance[T]()   
at Markdig.Helpers.DefaultObjectCache`1.NewInstance()   
at Markdig.Parsers.MarkdownParser.ProcessInlines()   
at Markdig.Parsers.MarkdownParser.Parse()   
at Markdig.Markdown.ToHtml(String markdown, MarkdownPipeline pipeline)   
at ReportExprHostImpl.CustomCodeProxy.MarkdownToHtml(String str)   
at ReportExprHostImpl.CustomCodeProxy.FormatMarkdown(String strInput)

The problem is repeatable and happens on both our prod SSRS server and my local SSRS server.

When I test this same thing under a standalone VB.NET console app compiled to .NET Framework 3.5 and referencing the same net35 markdig.dll, I do not get any crashes.

Originally created by @amonroejj on GitHub (Feb 6, 2020). Using 0.18.1.0 that I compiled locally in Visual Studio 2019 Professional. Within an SSRS report: If I feed `# Contact = Dummy` (heading) to Markdig, I correctly get `<h1>Contact = Dummy</h1>` (and if I enable HTML for this placeholder in the report, it correctly displays as a header.) If I feed `* Contact = Dummy` (bullet list) to Markdig, I get this exception: ``` Attempt by method 'Markdig.Helpers.DefaultObjectCache`1<System.__Canon>.NewInstance()' to access method 'Markdig.Parsers.MarkdownParser +ContainerItem..ctor()' failed. at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) at System.Activator.CreateInstance[T]() at Markdig.Helpers.DefaultObjectCache`1.NewInstance() at Markdig.Parsers.MarkdownParser.ProcessInlines() at Markdig.Parsers.MarkdownParser.Parse() at Markdig.Markdown.ToHtml(String markdown, MarkdownPipeline pipeline) at ReportExprHostImpl.CustomCodeProxy.MarkdownToHtml(String str) at ReportExprHostImpl.CustomCodeProxy.FormatMarkdown(String strInput) ``` The problem is repeatable and happens on both our prod SSRS server and my local SSRS server. When I test this same thing under a standalone VB.NET console app compiled to .NET Framework 3.5 and referencing the same net35 markdig.dll, I do not get any crashes.
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Reference: starred/markdig#348
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