更新我的模型然后重新评估IsValid？

Question

我将一些值传递给我的控制器动作,一切都很好.POST设计中将缺少两个属性.

然后我设置缺失的值,但后来我想验证模型,它仍然是假的,因为看起来ModelState没有赶上我的更改.

[HttpPost, Authorize]
public ActionResult Thread(int id, string groupSlug, Comment comment, string submitButton)
{
  comment.UserID = UserService.UID;
  comment.IP = Request.UserHostAddress;
  UpdateModel(comment); //throws invalidoperationexception
  if (ModelState.IsValid) // returns false if i skip last line
  {
    //save and stuff
    //redirect
  }
  //return view
}

什么是最简洁的方法来轻拍模型状态并告诉它一切都会好的,同时仍然验证从用户的POST绑定的所有其他内容

Answer 1

如果模型需要缺少的值,但在绑定之后才会提供,则可能需要清除由这两个值引起的错误ModelState.

[HttpPost, Authorize]
public ActionResult Thread(int id, string groupSlug, Comment comment, string submitButton)
{
  comment.UserID = UserService.UID;
  comment.IP = Request.UserHostAddress;

  //add these two lines
  ModelState["comment.UserID"].Errors.Clear();
  ModelState["comment.IP"].Errors.Clear();

  UpdateModel(comment); //throws invalidoperationexception
  if (ModelState.IsValid) // returns false if i skip last line
  {
    //save and stuff
    //redirect
  }
  //return view
}

Answer 2

我正在使用ASP.NET Core 1.0.0和异步绑定,对我来说解决方案是使用ModelState.Remove并传递属性名称(没有对象名称).

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Submit([Bind("AerodromeID,ObservationTimestamp,RawObservation")] WeatherObservation weatherObservation)
{
    weatherObservation.SubmitterID = this.User.FindFirst(ClaimTypes.NameIdentifier)?.Value;
    weatherObservation.RecordTimestamp = DateTime.Now;

    ModelState.Remove("SubmitterID");

    if (ModelState.IsValid)
    {
        _context.Add(weatherObservation);
        await _context.SaveChangesAsync();
        return RedirectToAction("Index", "Aerodrome");
    }
    return View(weatherObservation);
}