private static void Unregister(string groupName, RadioButton radioButton)
{
List<WeakReference> weakReferences;
if (groupName == null)
{
groupName = "";
}
if (RadioButton.groupNameToElements != null && RadioButton.groupNameToElements.TryGetValue(groupName, out weakReferences) && weakReferences != null)
{
RadioButton.PurgeExpiredReferences(weakReferences, radioButton);
if (weakReferences.Count == 0)
{
RadioButton.groupNameToElements.Remove(groupName);
}
}
}
private static void Register(string groupName, RadioButton radioButton)
{
if (groupName == null)
{
groupName = "";
}
if (RadioButton.groupNameToElements == null)
{
RadioButton.groupNameToElements = new Dictionary<string, List<WeakReference>>(1);
}
List<WeakReference> weakReferences = null;
if (!RadioButton.groupNameToElements.TryGetValue(groupName, out weakReferences) || weakReferences == null)
{
weakReferences = new List<WeakReference>(1);
RadioButton.groupNameToElements[groupName] = weakReferences;
}
else
{
RadioButton.PurgeExpiredReferences(weakReferences, null);
}
weakReferences.Add(new WeakReference(radioButton));
}
