我有2个ajax api调用，一个在一个长时间的过程中获取数据，另一个使用IProgress接口获取进度值，并每5秒执行一次。当进入调试器时，我可以看到值在ReportProgress中更新，并且这个值被设置为_generateRecipeCardsStatus属性。我的问题是，当调用getProgress() -> GeneratePrintRecipeCardsStatus时，属性_generateRecipeCardsStatus始终为零，我错在哪里？
谢谢
<script>
    getData();
    getProgress()
    // 长时间的过程
    function getData() {
        const token = $('input[name="__RequestVerificationToken"]').val();
        $.ajax({
            headers: {
                'X-Requested-With': 'XMLHttpRequest',
                "X-ANTI-FORGERY-TOKEN": token
            },
            type: 'POST',
            url:  `@Url.Action("GeneratePrintRecipeCards", "MenuPrintout")?id=` + @Model.RecipeCardLabelId + `&menuHeaderId=` + @Model.MenuHeaderId, 
            success: function(response){
                 console.log(response)
                 const { errorMsg, progressValue } = response
                inProgressEle.hide();
                close.show();
                if (errorMsg) {
                    toast(errorMsg, "error")
                }
                else if (progressValue > 0) {
                    console.log("进度值：" + progressValue);   
                }
                else{ 
                    expand.hide()
                    collapse.hide()
                    statusEle.text("准备就绪");
                    completedEle.fadeIn() 
                }
            }
        });
    }
     // 获取进度
    function getProgress() {
         setInterval(function(){ 
            $.ajax({
                url: '@Url.Action("GeneratePrintRecipeCardsStatus", "MenuPrintout")', 
                type: "GET",
                success: function (response) {
                    console.log(response)
                    $('#lblStatus').text(response)
                }
            })
        }, 5000)
    }
</script>
// 控制器
public class MenuPrintoutController : BaseController
{
    private readonly IMenuLabelService _menuLabelService;
    private int _generateRecipeCardsStatus;
    private Progress<int> _progress;
    public MenuPrintoutController(IMenuLabelService menuLabelService)
    {
        _menuLabelService = menuLabelService;
    }
    // 总是为零
    public int GeneratePrintRecipeCardsStatus()
    {
        return _generateRecipeCardsStatus;
    }
    // 更新正常
    private void ReportProgress(int progress)
    {
        _generateRecipeCardsStatus = progress;
    }
    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> GeneratePrintRecipeCards(int id, int menuHeaderId)
    {
        try
        {
            _progress = new Progress<int>(ReportProgress);
            var data = await _menuLabelService.DoAsync(int menuHeaderId, _progress);
            TempData.Put("PrintRecipeCards", data);
            return Json(new { Success = true });
        }
        catch (Exception exp)
        {
            return Json(new { ErrorMsg = exp.Message });
        }
    }
}
// 服务
public interface IMenuLabelService
{ 
    Task<object> DoAsync(int menuHeaderId, IProgress<int> progress);
}
public class MenuLabelService : IMenuLabelService
{
    public async Task<object> DoAsync(int menuHeaderId, IProgress<int> progress) 
    {
        var menuFoodItemsList = _context.FoodItemUnits
            .Where(x => x.MenuSectionFoodItemUnits.Any(y => y.Menusection.MenuheaderId == menuHeaderId))
            .Select(x => x.Fooditem)
            .ToList();
        var menuFoodItems = new List<PrintLabel>();
        var donePointer = 0;
        foreach (var menuFoodItem in menuFoodItemsList)
        {
            menuFoodItems.Add(menuFoodItem);
            // ...
            
            progress.Report((int)(++donePointer / (double)menuFoodItemsList.Count * 100));
            donePointer++;
        }
        return menuFoodItems;
    }
}