public static CompilationUnitSyntax AddUsingDirectives(
this CompilationUnitSyntax root,
IList<UsingDirectiveSyntax> usingDirectives,
SyntaxNode contextNode,
bool placeSystemNamespaceFirst,
params SyntaxAnnotation[] annotations)
{
if (!usingDirectives.Any())
{
return root;
}
var firstOuterNamespaceWithUsings = contextNode.GetInnermostNamespaceDeclarationWithUsings();
if (firstOuterNamespaceWithUsings == null)
{
return root.AddUsingDirectives(usingDirectives, placeSystemNamespaceFirst, annotations);
}
else
{
var newNamespace = firstOuterNamespaceWithUsings.AddUsingDirectives(usingDirectives, placeSystemNamespaceFirst, annotations);
return root.ReplaceNode(firstOuterNamespaceWithUsings, newNamespace);
}
}