private AttachedProperty(string name, Type owningType, Type propertyType,
object defaultValue = null,
Func <object, bool> validate = null,
AttachedPropertyChangedCallback changed = null)
{
Name = name;
OwningType = owningType;
PropertyType = propertyType;
DefaultValue = defaultValue;
Validate = validate;
Changed = changed;
}
/// <remarks>
/// Parameters correspond to properties on this class.
/// </remarks>
public static AttachedProperty Create(
string name, Type owningType, Type propertyType,
object defaultValue = null,
Func <object, bool> validate = null,
AttachedPropertyChangedCallback changed = null)
{
if (propertyType.IsValueType && defaultValue == null)
{
// Use activator to create uninitialized version of value type.
defaultValue = Activator.CreateInstance(propertyType);
}
return(new AttachedProperty(name, owningType, propertyType, defaultValue, validate, changed));
}
