protected override async Task <Document> PerformCodeFixActionAsync(CodeFixContext context, SyntaxNode syntaxNode, CancellationToken cancellationToken)
{
var document = context.Document;
var semanticModel = await document.GetSemanticModelAsync(cancellationToken);
var argument = syntaxNode as AttributeArgumentSyntax;
var targetType = GetTypeSymbol(argument);
argument.GetAttributeRelatedParents(out var argumentList, out var attribute, out var attributeList);
var typeParameter = attributeList.Parent as TypeParameterSyntax;
var attributes = typeParameter.AttributeLists.SelectMany(l => l.Attributes)
.Where(a => a.ArgumentList?.Arguments.Count > 0)
.Where(a => a.IsGenericConstraintAttribute <ConstrainedTypesAttributeBase>(semanticModel));
var arguments = attributes.SelectMany(a => a.ArgumentList.Arguments);
arguments = arguments.Where(a => a != argument);
var removed = arguments.Where(ArgumentRemovalPredicate);
return(await context.RemoveAttributeArgumentsCleanAsync(removed, SyntaxRemoveOptions.KeepNoTrivia, cancellationToken));
ITypeSymbol GetTypeSymbol(AttributeArgumentSyntax arg)
{
return(semanticModel.GetTypeInfo((arg.Expression as TypeOfExpressionSyntax)?.Type).Type);
}
bool ArgumentRemovalPredicate(AttributeArgumentSyntax arg)
{
var typeSymbol = GetTypeSymbol(arg);
return(typeSymbol.Equals(targetType, SymbolEqualityComparer.Default));
}
}
