void MakeDirty()
{
// called within syncroot
if (!isDirty) {
isDirty = true;
if (parent != null)
parent.MakeDirty();
}
}
/// <summary>
/// Retrieves a nested property container; creating a new one on demand.
/// Multiple calls to this method will return the same instance (unless the entry at this key
/// is overwritten by one of the Set-methods).
/// Changes performed on the nested container will be persisted together with the parent container.
/// </summary>
public Properties NestedProperties(string key)
{
bool isNewContainer = false;
Properties result;
lock (syncRoot) {
object oldValue;
dict.TryGetValue(key, out oldValue);
result = oldValue as Properties;
if (result == null) {
result = new Properties(this);
dict[key] = result;
result.MakeDirty();
}
}
if (isNewContainer)
OnPropertyChanged(key);
return result;
}