private static void Handle(SyntaxNodeAnalysisContext context)
{
if (!context.IsExcludedFromAnalysis() &&
context.Node is AssignmentExpressionSyntax assignment &&
context.SemanticModel.TryGetSymbol(assignment.Left, context.CancellationToken, out ISymbol left))
{
if (context.SemanticModel.TryGetSymbol(assignment.Right, context.CancellationToken, out ISymbol right) &&
AreSame(assignment.Left, assignment.Right) &&
assignment.FirstAncestorOrSelf <InitializerExpressionSyntax>() == null &&
left.Equals(right))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.GU0010DoNotAssignSameValue, assignment.GetLocation()));
}
if (assignment.Right is IdentifierNameSyntax identifier &&
context.ContainingSymbol is IMethodSymbol method &&
method.DeclaredAccessibility.IsEither(Accessibility.Internal, Accessibility.Protected, Accessibility.Public) &&
method.Parameters.TryFirst(x => x.Name == identifier.Identifier.ValueText, out var parameter) &&
parameter.Type.IsReferenceType &&
!parameter.HasExplicitDefaultValue &&
!NullCheck.IsChecked(parameter, assignment.FirstAncestor <BaseMethodDeclarationSyntax>(), context.SemanticModel, context.CancellationToken))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.GU0012NullCheckParameter, assignment.Right.GetLocation()));
}
if (IsRedundantAssignment(left, assignment, context))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.GU0015DoNotAssignMoreThanOnce, assignment.GetLocation()));
}
}
}
private static void Handle(SyntaxNodeAnalysisContext context)
{
if (!context.IsExcludedFromAnalysis() &&
context.Node is ParameterSyntax parameterSyntax &&
context.ContainingSymbol is IMethodSymbol method &&
method.DeclaredAccessibility.IsEither(Accessibility.Internal, Accessibility.Protected, Accessibility.Public) &&
method.TryFindParameter(parameterSyntax.Identifier.ValueText, out var parameter) &&
parameter.Type.IsReferenceType &&
parameter.RefKind != RefKind.Out &&
!parameter.HasExplicitDefaultValue &&
parameterSyntax.Parent is ParameterListSyntax parameterList &&
parameterList.Parent is BaseMethodDeclarationSyntax methodDeclaration &&
!NullCheck.IsChecked(parameter, methodDeclaration, context.SemanticModel, context.CancellationToken))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.GU0012NullCheckParameter, parameterSyntax.Identifier.GetLocation()));
}
}
private static void Handle(SyntaxNodeAnalysisContext context)
{
if (context.IsExcludedFromAnalysis())
{
return;
}
if (context.Node is ParameterSyntax parameterSyntax &&
context.ContainingSymbol is IMethodSymbol method &&
method.DeclaredAccessibility.IsEither(Accessibility.Internal, Accessibility.Protected, Accessibility.Public) &&
method.Parameters.TryFirst(x => x.Name == parameterSyntax.Identifier.ValueText, out var parameter) &&
parameter.Type.IsReferenceType &&
!parameter.HasExplicitDefaultValue &&
!NullCheck.IsChecked(parameter, parameterSyntax.FirstAncestor <BaseMethodDeclarationSyntax>(), context.SemanticModel, context.CancellationToken))
{
context.ReportDiagnostic(Diagnostic.Create(GU0012NullCheckParameter.Descriptor, parameterSyntax.Identifier.GetLocation()));
}
}