private async Task <Document> AddAnnotation(Document document,
Diagnostic diagnostic,
CancellationToken cancellationToken)
{
var root = await document.GetSyntaxRootAsync().ConfigureAwait(false);
var methodDeclaration = root.FindToken(diagnostic.Location.SourceSpan.Start).Parent
.AncestorsAndSelf()
.OfType <MethodDeclarationSyntax>()
.First();
if (methodDeclaration == null)
{
return(document);
}
var attributesList = methodDeclaration.AttributeLists[0];
var annotationValidate = SF.AttributeList()
.AddAttributes(SF.Attribute(SF.IdentifierName("ValidateAntiForgeryToken")))
.WithLeadingTrivia(CodeFixUtil.KeepLastLine(attributesList.GetLeadingTrivia()));
var nodes = new List <SyntaxNode> {
annotationValidate
};
var newRoot = root.InsertNodesAfter(attributesList, nodes);
return(document.WithSyntaxRoot(newRoot));
}