public static void Analyze(SyntaxNodeAnalysisContext context, AssignmentExpressionSyntax assignment)
{
ExpressionSyntax right = assignment.Right;
if (right?.IsKind(SyntaxKind.ObjectCreationExpression) == true)
{
var objectCreation = (ObjectCreationExpressionSyntax)right;
SemanticModel semanticModel = context.SemanticModel;
CancellationToken cancellationToken = context.CancellationToken;
ITypeSymbol typeSymbol = semanticModel.GetTypeSymbol(objectCreation, cancellationToken);
if (typeSymbol != null &&
Symbol.IsEventHandlerOrConstructedFromEventHandlerOfT(typeSymbol, semanticModel))
{
ArgumentListSyntax argumentList = objectCreation.ArgumentList;
if (argumentList != null)
{
SeparatedSyntaxList <ArgumentSyntax> arguments = argumentList.Arguments;
if (arguments.Count == 1)
{
ArgumentSyntax argument = arguments.First();
ExpressionSyntax expression = argument.Expression;
if (expression != null)
{
IMethodSymbol methodSymbol = semanticModel.GetMethodSymbol(expression, cancellationToken);
if (methodSymbol != null)
{
ExpressionSyntax left = assignment.Left;
if (left?.IsMissing == false &&
semanticModel.GetSymbol(left, cancellationToken)?.IsEvent() == true &&
!objectCreation.SpanContainsDirectives())
{
context.ReportDiagnostic(DiagnosticDescriptors.RemoveRedundantDelegateCreation, right.GetLocation());
context.FadeOutToken(DiagnosticDescriptors.RemoveRedundantDelegateCreationFadeOut, objectCreation.NewKeyword);
context.FadeOutNode(DiagnosticDescriptors.RemoveRedundantDelegateCreationFadeOut, objectCreation.Type);
context.FadeOutParentheses(DiagnosticDescriptors.RemoveRedundantDelegateCreationFadeOut, objectCreation.ArgumentList);
}
}
}
}
}
}
}
}
