问如何在视图第一次加载时加载部分视图？

EN

@model ViewModelTest.ViewModels.StudentBehaviorDetailBySemesterViewModel

// ... code ...

@using (Ajax.BeginForm(actionName: "PartialTable",
    controllerName: "StudentBehaviorDetailBySemester",
    ajaxOptions: new AjaxOptions { UpdateTargetId = "TableData" }))
{
    <div>
        <p>Campus: @Html.DropDownListFor(c => c.SelectedCampus, Model.CampusList)</p>
        <p>FY: @Html.DropDownListFor(c => c.SelectedFy, Model.FyList)</p>
        <input type="submit" value="submit" />
    </div>
}

<div id="TableData">
    @{Html.Action("PartialTable", "StudentBehaviorDetailBySemester"
          , new { vm = Model });}
</div>


@section scripts
{
    <script src="~/Scripts/jquery.unobtrusive-ajax.js"></script>
}

[HttpGet]
public ActionResult Index(string SelectedCampus="MRA", string SelectedFy="FY16")
{
    StudentBehaviorDetailBySemesterViewModel vm 
      = new StudentBehaviorDetailBySemesterViewModel();    
    vm.SelectedCampus = SelectedCampus;
    vm.SelectedFy = SelectedFy;

    vm.CampusList = new SelectList(Repositories.SelectLists.CampusList());
    vm.FyList = new SelectList(Repositories.SelectLists.FiscalYearList());
    return View(vm);
}


public ActionResult PartialTable(StudentBehaviorDetailBySemesterViewModel vm)
{
    using (TestAccountContext db = new TestAccountContext())
    {
        var query = db.StudentBehaviorDetailBySemesters
            .Where(m => m.Campus == vm.SelectedCampus)
            .Where(m => m.Fy == vm.SelectedFy).ToList();
        vm.BehaviorDetail = query;
    }

    return PartialView("PartialTable", vm);
}