asp.net-mvc – ModelState.AddModelError – 未显示错误

...
catch (EmailAlreadyExistsException emailAlreadyExistsException)
{
    ModelState.AddModelError("Useraccount_Email","This is an error message");

    RegisterViewModel viewModel = new RegisterViewModel
    {
        Useraccount = useraccount,InformationMessages = InformationMessageHelper.GetInformationMessages()
    };
    return PartialView(viewModel);
}
...

现在应该在我的视图中显示错误消息：

@using (Ajax.BeginForm("Register",new AjaxOptions { HttpMethod = "Post",OnSuccess = "registerAjaxSuccess" }))
{
    @Html.ValidationSummary(true)        
    <div class="ym-grid">
        <div class="ym-g33 ym-gl">
            <div class="ym-gbox">
                @Html.LabelFor(model => model.Useraccount.LastName)
            </div>
...
    <div class="ym-grid">
        <div class="ym-g33 ym-gl">
            <div class="ym-gbox">
                @Html.LabelFor(model => model.Useraccount.Email)
            </div>
        </div>
        <div class="ym-g33 ym-gl">
            <div class="ym-gbox">                  
                @Html.EditorFor(model => model.Useraccount.Email,new { required = "required" })                 
            </div>
        </div>
        <div class="ym-g33 ym-gr">
            <div class="ym-gbox">
               @Html.ValidationMessageFor(model => model.Useraccount.Email)
            </div>
        </div>
    </div>
...

但在这种情况下没有显示任何内容.

（编辑：李大同）

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