1

我写了一个自定义属性：

  public class VerifyOrderAttribute : RequiredAttribute   {
      protected override ValidationResult IsValid(object value, ValidationContext validationContext)
      {
         if (DoesOrderExist((string)value))
            return ValidationResult.Success;

         ValidationResult vr = new ValidationResult("Order does not exist");

         return vr;
        //return base.IsValid(value, validationContext);
      }

      private bool DoesOrderExist(string sOrderSequence)
      {
         PullParts.PartProcessor o = new PullParts.PartProcessor();
         bool result = o.CheckOrder(sOrderSequence);
         return result;
      }
  }

我将 VerifyOrder 属性与我的属性一起使用：

  [Required(ErrorMessage= "Order number is required")]
  [RegularExpression(@"\d{2}-\d{6}-\d{2}", ErrorMessage="Order number must be in format XX-XXXXXX-XX")]
  [VerifyOrder(ErrorMessage="Order number does not exist")]
  public global::System.String OrderNumber
  {
     get
     {
        return _OrderNumber;
     }
     set
     {
        _OrderNumber = value;
     }
  }
  private global::System.String _OrderNumber;

在我看来，我调用了 ValidationMessageFor()：

<div>
    <label class="span2">*Order Number:</label>
    @Html.TextBoxFor(x => x.Request.OrderNumber, new { @class = "span3" })
    @Html.ValidationMessageFor(x => x.Request.OrderNumber)
</div>

看起来 ValidationMessageFor 没有为我的自定义属性调用 IsValid() 。我希望我的自定义属性 VerifyOrder 像Required 属性一样工作。我需要做什么？

提前致谢！

编辑（从评论中移出）

我确实像这样在控制器中检查了它：

[HttpPost]
public ActionResult Index(MSDModel m) {
    if (ModelState.IsValid) {
        model.Request = m.Request; 
        model.SaveRequest(); 
        model.Request.OrderNumber = string.Empty; 
    } 
    return View(model);
}

但等到用户提交为时已晚。我想在处理之前检查订单是否存在。而且我需要向用户显示它是否存在的视觉指示器。我怎样才能实现这种行为？

4

0 回答 0