dotnet/roslyn

NRE from Microsoft.CodeAnalysis.GenerateMember.GenerateConstructor.AbstractGenerateConstructorService`2.GenerateConstructorAsync

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#55.731 aperta il 19 ago 2021

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While editing in Roslyn.sln

System.ArgumentNullException : Value cannot be null.
Parameter name: node
   at Microsoft.CodeAnalysis.VisualBasic.VBSemanticModel.CheckSyntaxNode(VisualBasicSyntaxNode node)
   at Microsoft.CodeAnalysis.VisualBasic.SyntaxTreeSemanticModel.ClassifyConversion(ExpressionSyntax expression,ITypeSymbol destination)
   at Microsoft.CodeAnalysis.VisualBasic.VisualBasicExtensions.ClassifyConversion(SemanticModel semanticModel,ExpressionSyntax expression,ITypeSymbol destination)
   at Microsoft.CodeAnalysis.VisualBasic.VisualBasicSemanticFactsService.ClassifyConversion(SemanticModel semanticModel,SyntaxNode expression,ITypeSymbol destination)
   at Microsoft.CodeAnalysis.GenerateMember.GenerateConstructor.GenerateConstructorHelpers.IsCompatible[TExpressionSyntax](ISemanticFactsService semanticFacts,SemanticModel semanticModel,IMethodSymbol constructor,ImmutableArray`1 expressions)
   at Microsoft.CodeAnalysis.GenerateMember.GenerateConstructor.GenerateConstructorHelpers.CanDelegateTo[TExpressionSyntax](SemanticDocument document,ImmutableArray`1 parameters,ImmutableArray`1 expressions,IMethodSymbol constructor)
   at Microsoft.CodeAnalysis.GenerateMember.GenerateConstructor.AbstractGenerateConstructorService`2.State.FindConstructorToDelegateTo(ImmutableArray`1 parameters,ImmutableArray`1 expressions,ImmutableArray`1 constructors,CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.GenerateMember.GenerateConstructor.AbstractGenerateConstructorService`2.State.FindConstructorToDelegateTo(ImmutableArray`1 allParameters,ImmutableArray`1 allExpressions,CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.GenerateMember.GenerateConstructor.AbstractGenerateConstructorService`2.State.TryInitializeDelegatedConstructor(CancellationToken cancellationToken)
   at async Microsoft.CodeAnalysis.GenerateMember.GenerateConstructor.AbstractGenerateConstructorService`2.State.TryInitializeAsync[TService,TExpressionSyntax](<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.GenerateMember.GenerateConstructor.AbstractGenerateConstructorService`2.State.GenerateAsync[TService,TExpressionSyntax](<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.GenerateMember.GenerateConstructor.AbstractGenerateConstructorService`2.GenerateConstructorAsync[TService,TExpressionSyntax](<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.CodeFixes.GenerateMember.AbstractGenerateMemberCodeFixProvider.RegisterCodeFixesAsync(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.Extensions.IExtensionManagerExtensions.PerformActionAsync(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)

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Direzione di ricerca
Indaga sulla NullReferenceException in AbstractGenerateConstructorService. L'arresto anomalo si verifica quando si tenta di classificare la conversione con un nodo di espressione nullo. Esamina il metodo State.FindConstructorToDelegateTo e il metodo TryInitializeDelegatedConstructor nel modello semantico VB. Controlla se il parametro node è null quando viene chiamato CheckSyntaxNode. Aggiungi controlli di null o assicurati che l'espressione non sia nulla prima dell'elaborazione. Rivedi anche il metodo VisualBasicSemanticFactsService.ClassifyConversion.
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