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

Question

在我的控制器中捕获到异常后，我想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);
}
...

错误消息现在应该显示在我的视图中：

@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。：（ 我做错什么了？

Answer 1

添加模型错误时，使用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");

Answer 2

请使用 ModelState.AddModelError(string.Empty, "This is an error message"); 和@Html.ValidationSummary(true);

这将起作用。