void Walk(RegistryKey parentKey, string[] names, ExpectKeyFoundAction ifFoundAction, bool create = false, int nextNameIndex = 0)
{
if (nextNameIndex < names.Length)
{
// This function is recursive because we use
// ExpectKey() whose using{} block controls
// destruction.
ExpectKey(parentKey, names[nextNameIndex], childKey => Walk(childKey, names, ifFoundAction, create, nextNameIndex + 1), create, nextNameIndex + 1 >= names.Length);
}
else
{
ifFoundAction(parentKey);
}
}
void ExpectKey(RegistryKey parent, string name, ExpectKeyFoundAction ifFoundAction, bool create = false, bool writable = false)
{
Console.Error.WriteLine("Opening {0}/{1}. create={2}", parent.Name, name, create);
using (var key = parent.OpenSubKey(name, writable) ?? (create ? parent.CreateSubKey(name) : null))
{
if (key == null)
{
Console.Error.WriteLine("Could not open {0}.", name);
}
else
{
ifFoundAction(key);
}
}
}