ASP.NET MVC - 验证消息未显示

Question

所有这些字段都在模型中被赋予了必需的属性。但如果留空并按下提交按钮，则不会显示验证消息。

@using (Html.BeginForm("Login", "Account", null, FormMethod.Post))
{
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    @Html.AntiForgeryToken()
    <br />

    <div class="container">
        <div class="row">

            <h2 style="text-align: center;">@ViewBag.Title</h2>
            <div class="col-sm-6 col-md-4 col-md-offset-4">
                <div class="account-wall">
                    <h3 style="text-align: center; color: #b3b3b3;">Login to your account</h3>


                    <div class="form-signin">

                        @*Email*@
                        @Html.TextBoxFor(m => m.Email, new { @class = "form-control", placeholder = @Html.DisplayNameFor(m => m.Email) })
                        @Html.ValidationMessageFor(m => m.Email, "", new { @class = "text-danger" })

                        @*Password*@
                        @Html.PasswordFor(m => m.Password, new { @class = "form-control", placeholder = @Html.DisplayNameFor(m => m.Password) })
                        @Html.ValidationMessageFor(m => m.Password, "", new { @class = "text-danger" })

                        @*Submit*@
                        <div class="centered">
                            <button type="button" class="btn btn-success " typeof="submit">
                                Login
                            </button>
                        </div>

                        <a href="@Url.Action("Register", "Account")"><span>Register</span></a>
                    </div>
                </div>
            </div>
        </div>
    </div>
}