/// <summary>
/// Clear this field from the given DependencyObject instance.
/// </summary>
/// <param name="instance"></param>
public void ClearValue(DependencyObject instance)
{
if (instance != null)
{
EntryIndex entryIndex = instance.LookupEntry(_globalIndex);
instance.UnsetEffectiveValue(entryIndex, null /* dp */, null /* metadata */);
}
else
{
throw new ArgumentNullException("instance");
}
}
/// <summary>
/// Write the given value onto a DependencyObject instance.
/// </summary>
/// <param name="instance">The DependencyObject on which to set the value.</param>
/// <param name="value">The value to set.</param>
public void SetValue(DependencyObject instance, T value)
{
if (instance != null)
{
EntryIndex entryIndex = instance.LookupEntry(_globalIndex);
// Set the value if it's not the default, otherwise remove the value.
if (!object.ReferenceEquals(value, _defaultValue))
{
instance.SetEffectiveValue(entryIndex, null /* dp */, _globalIndex, null /* metadata */, value, BaseValueSourceInternal.Local);
_hasBeenSet = true;
}
else
{
instance.UnsetEffectiveValue(entryIndex, null /* dp */, null /* metadata */);
}
}
else
{
throw new ArgumentNullException("instance");
}
}
