private void CheckKeyFields(IEnumerable <PropertyInfo> properties, object obj)
{
bool avaiable = ReflectionUtils.CheckPropertyAvailable(properties.ToArray(), obj);
if (!avaiable)
{
throw new NullKeyException(obj.GetType().Name + " " + string.Join(",", properties.Select(o => o.Name).ToArray()) + "键值没有赋值");
}
}