将数据从 DropDownList 发布到 MVC 控制器

我有一个 MVC，多个选择DropDownList，用于填充SelectListItem模型中的选择项。

@Html.DropDownList("EmployeeStatuses", (IEnumerable<SelectListItem>)ViewBag.EmployeeStatuses, new { multiple = "multiple", style = "width: 100%;", @class = "select2", onchange = "UpdateEmployeeStatusFilter()", id = "employee-status-type" })

当用户从 中选择或取消选择项目时DropDownList，我想在我的控制器中运行一个方法来过滤视图中的数据。这是通过onChange事件完成的UpdateEmployeeStatusFilter()。

<script type="text/javascript">
    function UpdateEmployeeStatusFilter() {
      var value = $('#employee-status-type').val();
      console.log(value);
      var a = ["X", "Y", "Z"];
      console.log(a);
      $.ajax({
        type: 'POST',
        url: '@Url.Action("SearchEmployee", "Employee")',
        data: { valueMember: value },
        dataType: 'json',
        traditional: true,
        success: function (msg) { alert(msg) }
    });

    };
  </script>

当我调试脚本时，我能够获取 的值value并将其写入控制台窗口。调用控制器方法时，值为null。

public IActionResult SearchEmployee(string itemsSelected)
{
    // Do Stuff with itemsSelected
    return RedirectToAction("Index");
}

我的问题是如何将该值放入我的控制器中？

我不确定此代码是否相关，但为了清楚起见，我将其包含在内。

public IActionResult Index()
{
    // Get Employment Statuses
    IEnumerable<SelectListItem> statuses = _mockDataRepository.GetEmployeeStatuses().Select(c => new SelectListItem
    {
        Value = c.ValueMember,
        Text = c.DisplayMember,
        Selected = c.ValueMember == "AC"
    });
    ViewBag.EmployeeStatuses = statuses;
}

public class SelectListItem
{
    [Key]
    public string ValueMember { get; set; }
    public string DisplayMember { get; set; }
    public int SortOrder { get; set; } = 0;
}