Question

我在模拟类别上拥有财产,进行以下类型转换:

Model:

public class TimeClass
{
    private int timeInSeconds;

    [Required]
    public int Id {get;set;}

    [Required]
    public string Timer
    {
       get {
            TimeSpan ts = new TimeSpan(0,0,(int)timeInSeconds);
            return ts.ToString(@"mm:ss",CultureInfo.InvariantCulture);
       }
       set {
          try {
             var ts = TimeSpan.ParseExact(value, @"mm:ss", CultureInfo.InvariantCulture);
             timeInSeconds= Convert.ToInt32(ts.TotalSeconds);
          }
          catch {
             //Is it possible to add a validation error to the modelstate here
          }  
       }
    }
}

主计长:

[HttpPost]
public ActionResult Create(FormCollection collection)
{
  string[] whitelist = new[] {"Id", "Timer" };

  if (TryUpdateModel(quiz, whitelist))
  {
    //Save to Repo
    return RedirectToAction("Edit", new { Id = Id });
  }
  return View(tc);
}

What is the appropriate pattern to add an appropriate ModelError if the TimeSpan.Parse throws an exception? Currently it will give the generic error "The value "xxx" is invalid". How can I customize this to return a specific error?

Answer 1

您不能将审判量归入你的模型,而是可将处理错误的错误移至你的控制员代码。例如,如果主审法官放弃一个例外,你可能会增加一种习俗模式错误:

TimeClass model = new TimeClass();
string[] whitelist = new[] {"Id", "Timer" };
try
{
    UpdateModel(model);

    //Save to Repo
    return RedirectToAction("Edit", new { Id = Id });
}
catch
{
    // Generate error
    ModelState.AddModelError(string.Empty, "Model Error Here");

    return View(tc);
}

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