/// <summary>
 /// 把ModelState错误 添加到 BadRequestObjectResult对象里
 /// </summary>
 /// <param name="controller"></param>
 /// <param name="key">错误Key</param>
 /// <param name="error">错误信息</param>
 /// <returns>BadRequestObjectResult</returns>
 public static BadRequestObjectResult ModelStateError(this ControllerBase controller, string key, string error)
 {
     controller.AddStateError(key, error);
     return controller.BadRequest(controller.ModelState);
 }