/// <summary>
/// Gets the current value of the property for the object
/// </summary>
/// <returns>
/// Returns an object or null
/// </returns>
/// <param name='instance'>
/// The object to look up in the values dictionary
/// </param>
/// <param name='property'>
/// The property describing the value to look up.
/// </param>
/// <param name='addIfMissing'>Adds a reference if not found</param>
private static KeyValueWeakReference GetCurrent(object instance, AttachedProperty property, bool addIfMissing)
{
KeyValueWeakReference result = null;
if (ValueDictionary.ContainsKey(instance))
{
var values = ValueDictionary[instance];
result = values.FirstOrDefault(x => x.Target == instance && x.Key == property.PropertyKey);
if (result == null && addIfMissing)
{
result = new KeyValueWeakReference(instance, property.PropertyKey);
values.Add(result);
}
return(result);
}
if (addIfMissing)
{
result = new KeyValueWeakReference(instance, property.PropertyKey);
ValueDictionary.Add(instance, new List <KeyValueWeakReference>()
{
result
});
}
return(result);
}
/// <summary>
/// Gets the current value of the property for the object
/// </summary>
/// <returns>
/// Returns an object or null
/// </returns>
/// <param name='instance'>
/// The object to look up in the values dictionary
/// </param>
/// <param name='property'>
/// The property describing the value to look up.
/// </param>
/// <param name='addIfMissing'>Adds a reference if not found</param>
private static KeyValueWeakReference GetCurrent(object instance, AttachedProperty property, bool addIfMissing)
{
KeyValueWeakReference result = null;
if (ValueDictionary.ContainsKey(instance))
{
var values = ValueDictionary[instance];
result = values.FirstOrDefault(x => x.Target == instance && x.Key == property.PropertyKey);
if (result == null && addIfMissing)
{
result = new KeyValueWeakReference(instance, property.PropertyKey);
values.Add(result);
}
return result;
}
if (addIfMissing)
{
result = new KeyValueWeakReference(instance, property.PropertyKey);
ValueDictionary.Add(instance, new List<KeyValueWeakReference>() { result });
}
return result;
}