Crash bug when using QuickInfo

SyntaxEditor .NET Languages Add-on for WPF Forum

Posted 8 years ago by Craig - Varigence, Inc.
Version: 11.1.0545
Platform: .NET 4.0
Environment: Windows 7 (64-bit)
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Repro Steps:

1. Open the Actipro Sample Browser
2. Open the C# Editor (.NET Lang Add-On) sample
3. First, add a semicolon after "int ErrorTest = 1"
4. After the Console.WriteLine statement, insert a couple newlines
5. Then insert the following C#:

foreach (var bob in bobs.Where(item => item.Whatever) { } 
6. Hover over the word Whatever.

Result:
The Sample Browser crashes with a NRE.

Probable Cause:
I believe you'll find the issue is in the ResolverScopeManager's ScopeContext(ITypeMemberDefinition) constructor. You reference the containingTypeMemberDefinition's DeclaringType property without first checking if the containingTypeMemberDefinition is null.

Question:
Outside of adding a try-catch around the spot where we initiate a QuickInfo, is there any way we can avoid this exception from being thrown? I ask since we're hitting this in our own applications.

Thanks,

-Craig

Comments (1)

Posted 8 years ago by Actipro Software Support - Cleveland, OH, USA
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Hi Craig,

Thanks, we found that a few weeks ago and the fix is in the next version's codebase already.

As for a workaround, you can't prevent that bug since as you said, we missed a null check. What you are doing now is ok.

Or if you want to get a little crazier, you could create your own quick info provider service that wraps our CSharpQuickInfoProvider and replace the default CSharpQuickInfoProvider service with yours. In a GetContext method override, create a wrapper class that implements IDotNetContext and wrap the base.GetContext call with that if the result is non-null. In your IDotNetContext implementation for the Resolve method, put your try...catch there.


Actipro Software Support

The latest build of this product (v2019.1 build 0683) was released 19 days ago, which was after the last post in this thread.

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