表单验证不断要求在 MVC 上提供所需的 ID

我正在尝试验证表单。出于某种原因，当我提交表单时，表单验证显示“ID 字段是必需的”。然而，尽管它这么说，我有一个 HiddenFor 输入应该照顾它......

这是我的UserReportForm.cshtml视图（为便于阅读而缩短）：

@model  BugTracker.ViewModels.UserReportViewModel

@{
    ViewBag.Title = "Issue Form";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h1>Report Bug/Request Change</h1>
@Html.ValidationSummary(false, "Please fix the following errors.")
@using (Html.BeginForm("Save", "Report", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <div class="form-group">
        <label>Are you reporting a bug, or requesting a change to a page?</label>
        @Html.DropDownListFor(m => m.Report.RequestTypeID, new SelectList(Model.RequestType, "ID", "RequestBC"), "Select Issue", new { @class = "form-control" })
        @Html.ValidationMessageFor(m => m.Report.RequestTypeID)
    </div>
    <div class="form-group">
        <label>Name of Issue</label>
        @Html.TextBoxFor(m => m.Report.Name, new { @class = "form-control"})
        @Html.ValidationMessageFor(m => m.Report.Name)
    </div>
    <div class="form-group">
        <label>Detailed Description of Issue</label>
        @Html.TextAreaFor(m => m.Report.Description, new { @class = "form-control", @rows = "10"})
        @Html.ValidationMessageFor(m => m.Report.Description)
    </div>

    @Html.HiddenFor(m => m.Report.ID)
    <button type="submit" class="btn btn-primary">Save</button>
}

这是视图模型UserReportViewModel.c：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using BugTracker.Models;
using System.Web.Mvc;

namespace BugTracker.ViewModels
{
    public class UserReportViewModel
    {
        public Report Report { get; set; }
        public IEnumerable<RequestType> RequestType { get; set; }    
    }
}

和Report.cs模型：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;

namespace BugTracker.Models
{
    public class Report
    {
        //For User
        public int ID { get; set; }
        [Required]
        public String Name { get; set; }
        [Required]
        public String Description { get; set; }    
        public RequestType RequestType { get; set; }
        [Display (Name="Request Type")]
        public byte RequestTypeID { get; set; }    
    }
}

在我添加验证之前，这些表单在数据库中获取 ID 没有问题（每次增加 1）。为什么这会抱怨 ID，我该怎么做才能阻止它说它是必需的？

编辑：我认为这与它没有太大关系，但经过进一步审查，我认为我的控制器可能导致了这个问题：

新表格

    public ActionResult UserReportForm()
    {
        var requestType = _context.RequestType.ToList();
        var viewModel = new UserReportViewModel
        {
            RequestType = requestType,
        };
        return View(viewModel);
    }

保存表格

    [HttpPost]
    public ActionResult Save(UserReportViewModel viewModel)
    {
        if (!ModelState.IsValid)
        {
            var viewM = new UserReportViewModel
            {
                RequestType = _context.RequestType.ToList(),
            };

            return View("UserReportForm", viewM);
        }
        if (viewModel.Report.ID == 0)
        {
            _context.Reports.Add(viewModel.Report);
        }
        else
        {
            var reportInDb = _context.Reports.Single(c => c.ID == viewModel.Report.ID);
            reportInDb.Name = viewModel.Report.Name;
            reportInDb.Description = viewModel.Report.Description;
            reportInDb.RequestTypeID = viewModel.Report.RequestTypeID;
        }
        _context.SaveChanges();
        return RedirectToAction("Report", "Report", new { stat = 1 });

    }