public override SyntaxNode VisitParameterList(ParameterListSyntax node)
{
ParameterListSyntax originalNode = node;
//node = (ParameterListSyntax)base.VisitParameterList(node); can't - see below
int i = 0;
foreach (ParameterSyntax parameter in originalNode.Parameters)
{
if (RemoveParameter(parameter))
{
node = node.Update(
node.OpenParenToken,
node.Parameters.RemoveAt(i),
node.CloseParenToken);
continue;
}
// Can't use base.VisitParameterList(node) to inner-process all parameters because some that are destined
// to be stripped may cause processing errors (e.g. because they contain a generic type reference to a type
// parameter that is being eliminated). Therefore, do the work ourselves using base.VisitParameter(parameter)
// on each.
bool hasTrailingSeparator = i < node.Parameters.Count - 1;
bool hasLeadingSeparator = i > 0;
SyntaxToken originalSeparator = hasTrailingSeparator
? node.Parameters.GetSeparator(i)
: (hasLeadingSeparator
? node.Parameters.GetSeparator(i - 1)
: SyntaxFactory.MissingToken(SyntaxKind.CommaToken));
SeparatedSyntaxList <ParameterSyntax> parameters = node.Parameters
.RemoveAt(i)
.Insert(i, (ParameterSyntax)base.VisitParameter(parameter).WithTriviaFrom(node.Parameters[i]));
if (hasTrailingSeparator)
{
parameters = parameters.ReplaceSeparator(parameters.GetSeparator(i), originalSeparator);
}
else if (hasLeadingSeparator)
{
parameters = parameters.ReplaceSeparator(parameters.GetSeparator(i - 1), originalSeparator);
}
node = node.Update(
node.OpenParenToken,
parameters,
node.CloseParenToken);
i++;
}
return(node);
}