发送到控制器之前如何查看列表框中的选定项目？

Question

查看

@using Hospital.Areas.Administration.Models
@model ConfirmationModel
@{
    ViewBag.Title = "Index";
}

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
<section class="creating-doctor-section">
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    @Html.LabelFor(m => m.SelectedDoctorId)
    @Html.ListBoxFor(model => model.SelectedDoctorId, Model.Doctors, new { AutoPostBack = "True", onselectedindexchanged = "DoctorSelected", Id = "docs" })
    @Html.ValidationMessageFor(x => x.SelectedDoctorId, "", new { @class = "text-danger" })
    <div class="submit-button">
        <input type="submit" value="Create" class="btn btn-default" />
    </div>

</section>
}

查看模型

namespace Hospital.Areas.Administration.Models
{
    public class ConfirmationModel
    {
        [Required]
        public string SelectedDoctorId { get; set; }
        [Required]
        public string SelectedPatientId { get; set; }

        public IEnumerable<SelectListItem> Doctors { get; set; }
        public IEnumerable<SelectListItem> Patients { get; set; }
    }
}

请问我如何在我仅在ListBox中选择项目（不作为表单结果发送，而是在此之前）时实际显示值（例如，医生ID）。请给我您的解决方案！ 谢谢!!!