asp.net-mvc-3 - ModelState.AddModelError 未显示在我的 View 中

Question

我有以下 View ，它创建 10 个 ajax.beginform ，，但我面临的问题是，如果在创建对象期间发生错误，则 ModelState.AddModelError 将不会显示在 View 上，尽管我已经设置了 @Html.ValidationSummary(true) View 如下所示

@model Medical.Models.VisitLabResult

@for (int item = 0; item < 10; item++)
{
    <tr id = @item>
    @using (Ajax.BeginForm("CreateAll", "VisitLabResult", new AjaxOptions
    {
        HttpMethod = "Post",
        UpdateTargetId = item.ToString() + "td",
        InsertionMode = InsertionMode.Replace,
        LoadingElementId = "progress2",
        OnSuccess = string.Format(
            "disableform({0})",
            Json.Encode(item)),
    }))
    {  
        @Html.ValidationSummary(true)

        @Html.AntiForgeryToken()
        <td>
            @Html.DropDownList("LabTestID", String.Empty)
            @Html.ValidationMessageFor(model => model.LabTestID)
        </td>
        <td>
            @Html.EditorFor(model => model.Result)
            @Html.ValidationMessageFor(model => model.Result)
        </td>

        <td>
            @Html.EditorFor(model => model.DateTaken)
            @Html.ValidationMessageFor(model => model.DateTaken)
        </td>

        <td>
            @Html.EditorFor(model => model.Comment)
            @Html.ValidationMessageFor(model => model.Comment)
        </td>

        <td>
            <input type="submit" value="Create" />
        </td>

        <td id = @(item.ToString() + "td")>
        </td>
    }
    </tr>
    }
</table>

我定义 ModelState.AddModelError 的操作方法如下所示:-

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult CreateAll(VisitLabResult vlr, int visitid = 28)
{
    try
    {
        if (ModelState.IsValid)
        {
            var v = repository.GetVisit(visitid);
            if (!(v.EligableToStart(User.Identity.Name))){ 
                return View("NotFound"); 
            }
            vlr.VisitID = visitid;
            repository.AddVisitLabResult(vlr);
            repository.Save();

            return Content("Addedd Succsfully");
        }
    }
    catch (DbUpdateException)
    {
        JsonRequestBehavior.AllowGet);
        ModelState.AddModelError(string.Empty, "The Same test Type might have been already created,, go back to the Visit page to see the avilalbe Lab Tests");
    }
}

那么我如何在我的 View 上显示 ModelState.AddModelError。

Answer 1

我强烈建议您更改 try{ } catch(){ }

首先检查给定 ID 是否存在访问 如果是这样，只需返回带有添加的模型错误的模型

    if (visitExists)
    {
         ModelState.AddModelError("CustomError", "The Same test Type might have been already created,, go back to the Visit page to see the avilalbe Lab Tests");
         return View(vlr);    
    }
    //Other code here

将 AddModelError 更改为

ModelState.AddModelError("CustomError", "The Same test Type might have been already created,, go back to the Visit page to see the avilalbe Lab Tests");

在您看来，只需添加一个

@Html.ValidationMessage("CustomError")

然后，当您返回模型时，错误将显示在您放置 @Html.ValidationMessage ...的位置