private DependencyProperty(string name, Type propertyName, Type ownerType, object defaultValue)
{
this.Name = name;
this.Value = defaultValue;
this.HashCode = name.GetHashCode() ^ ownerType.GetHashCode();
PorpertypeMetadata metadata = new PorpertypeMetadata(defaultValue) {Type = ownerType};
_metadataMap.Add(metadata);
_defaultMetadata = metadata;
}
public void OverrideMetadata(Type forType, PorpertypeMetadata metadata)
{
metadata.Type = forType;
_metadataMap.Add(metadata);
}