实体框架SaveChanges（）不起作用

Question

调用用于更新的API时出现问题，并且savechanges()无法正常工作（数据未更新）。

但是，当我添加Thread.Sleep(1000); 数据正确更新。

工作方法

public async Task<ResponseBaseModel> AddOrderRemark2(AddOrderRemarkRequestModel model)
{
    try
    {
        using (ChatEntities context = new ChatEntities(CurrentUsername))
        {
            List<string> statusList = getPendingStatus(context).Result;
            OrderHeader orderHeader = getOrderHerderByOrderCode(context, model.OrderCode, model.SalesChannelId).Result;

            if (statusList.Contains(orderHeader.Status))
            {
                if (orderHeader != null)
                {
                    Thread.Sleep(1000);
                    orderHeader.Remark = model.Remark;
                    context.DBEntry(orderHeader, EntityState.Modified);
                    context.SaveChanges();
                }

            }

        }
        return new ResponseBaseModel(MessageCode.OK);
    }
    catch (Exception ex)
    {
        return new ResponseBaseModel(MessageCode.Fail, ex.InnerException.Message);
    }
}

失败方法

public async Task<ResponseBaseModel> AddOrderRemark2(AddOrderRemarkRequestModel model)
{
    try
    {
        using (ChatEntities context = new ChatEntities(CurrentUsername))
        {
            List<string> statusList = getPendingStatus(context).Result;
            OrderHeader orderHeader = getOrderHerderByOrderCode(context, model.OrderCode, model.SalesChannelId).Result;

            if (statusList.Contains(orderHeader.Status))
            {
                if (orderHeader != null)
                {
                    orderHeader.Remark = model.Remark;
                    context.DBEntry(orderHeader, EntityState.Modified);
                    context.SaveChanges();
                }

            }

        }
        return new ResponseBaseModel(MessageCode.OK);
    }
    catch (Exception ex)
    {
        return new ResponseBaseModel(MessageCode.Fail, ex.InnerException.Message);
    }
}

编辑

我已经意识到从客户端同时调用两个API。 此外，在同一个表这两个API更新'OrderHeader'同时包含接收信息和言论 ，之所以它会导致这个问题！。 我该如何防止这个问题呢？

        [HttpPost]
        [ActionName("AddReceiverAddress")]
        [ChatAuthentication]
        public async Task<ResponseBaseModel> AddReceiverAddress(AddReceiverAddressRequestModel model)
        {
            return _orderService.Value.AddReceiverAddress(model).Result;
        }

        [HttpPost]
        [ActionName("AddOrderRemark")]
        [ChatAuthentication]
        public async Task<ResponseBaseModel> AddOrderRemark(AddOrderRemarkRequestModel model)
        {
            return _orderService.Value.AddOrderRemark(model).Result;
        }

Answer 1

您没有正确使用异步。 试试这个

public async Task<ResponseBaseModel> AddOrderRemark2(AddOrderRemarkRequestModel model)
{
    try
    {
        using (ChatEntities context = new ChatEntities(CurrentUsername))
        {
            List<string> statusList = await getPendingStatus(context);
            OrderHeader orderHeader = await getOrderHerderByOrderCode(context, model.OrderCode, model.SalesChannelId);

Answer 2

调用此方法时，您是await还是在Wait()获得结果？

调用该方法时，您必须执行以下示例之一。

await AddOrderRemark2(model);

要么

AddOrderRemark2(model).Wait();