static bool TryGetDiagnostic(SyntaxNodeAnalysisContext nodeContext, out Diagnostic diagnostic)
{
diagnostic = default(Diagnostic);
if (nodeContext.IsFromGeneratedCode())
{
return(false);
}
var anyInvoke = nodeContext.Node as InvocationExpressionSyntax;
var info = nodeContext.SemanticModel.GetSymbolInfo(anyInvoke);
IMethodSymbol anyResolve = info.Symbol as IMethodSymbol;
if (anyResolve == null)
{
anyResolve = info.CandidateSymbols.OfType <IMethodSymbol>().FirstOrDefault(candidate => HasPredicateVersion(candidate));
}
if (anyResolve == null || !HasPredicateVersion(anyResolve))
{
return(false);
}
ExpressionSyntax target;
InvocationExpressionSyntax whereInvoke;
if (!ReplaceWithSingleCallToAnyAnalyzer.MatchWhere(anyInvoke, out target, out whereInvoke))
{
return(false);
}
info = nodeContext.SemanticModel.GetSymbolInfo(whereInvoke);
IMethodSymbol whereResolve = info.Symbol as IMethodSymbol;
if (whereResolve == null)
{
whereResolve = info.CandidateSymbols.OfType <IMethodSymbol>().FirstOrDefault(candidate => candidate.Name == "Where" && ReplaceWithSingleCallToAnyAnalyzer.IsQueryExtensionClass(candidate.ContainingType));
}
if (whereResolve == null || whereResolve.Name != "Where" || !ReplaceWithSingleCallToAnyAnalyzer.IsQueryExtensionClass(whereResolve.ContainingType))
{
return(false);
}
if (whereResolve.Parameters.Length != 1)
{
return(false);
}
var predResolve = whereResolve.Parameters[0];
if (predResolve.Type.GetTypeParameters().Length != 2)
{
return(false);
}
diagnostic = Diagnostic.Create(
descriptor,
anyInvoke.GetLocation()
);
return(true);
}
