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

Question

我想在 Controller 中捕获异常后为电子邮件字段设置错误消息:

...
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 View 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。 :(
我做错了什么？

Answer 1

添加模型错误时，处理复杂对象时正确的分隔符是点 .而不是 unsercore _
所以下面的调用应该有效:

ModelState.AddModelError("Useraccount.Email", "This is an error message");