Question

我试图将数据从ProductStatisticsTemp表逐行复制到ProductStatistics表。

    [HttpGet]
    public ActionResult Copy_DatatoProductStatistics()
    {
        string errormsg = "";
        //var incomplete_product_result = db.Database.SqlQuery<ProductStatistics>("Copy_ProductStatistics");
        var str = from a in db.ProductStatisticsTemp select a;

        ProductStatistics ls = new ProductStatistics();

        try
        {
            foreach (var val in str) // iterator the data from the list and insert them into the listSecond
            {
                var product = db.Product.Find(val.Product_ID);

                try
                {

                    if (product.ProductID == val.Product_ID & product.ProductTitleEn == val.ProductNameEn & product.ProductTitleAr == val.ProductNameAr)
                    {
                        try
                        {

                            if (!String.IsNullOrEmpty(val.SalesVolumes) | !String.IsNullOrEmpty(val.Target) | !String.IsNullOrEmpty(val.Profitability) | !String.IsNullOrEmpty(val.AnnualGrowthRate))
                            {
                                ls.Product_ID = val.Product_ID;
                                ls.ProductNameEn = val.ProductNameEn;
                                ls.ProductNameAr = val.ProductNameAr;
                                ls.Profitability = val.Profitability;
                                ls.Target = val.Target;
                                ls.SalesVolumes = val.SalesVolumes;
                                ls.Subsidary_ID = val.Subsidary_ID;
                                ls.AnnualGrowthRate = val.AnnualGrowthRate;

                                db.ProductStatistics.Add(ls);

                            }

                               db.SaveChanges();

                        }

                        catch (Exception ex)
                        {
                            errormsg = ex.Message;
                        }


                    }

                }
                catch (Exception ex)
                {
                    errormsg = "Product ID or Product Name Doesnt match with existing details";
                }

            }           


        }

        catch (Exception ex)
        {
            errormsg = ex.Message;                
        }


        return RedirectToAction("FileUpload", "FileUpload", new { error = errormsg });

    }

但在db.SaveChanges();之后，它指向catch (Exception ex)。一旦我调试，我可以看到以下内部异常消息

消息=＆＃34;不允许新事务，因为还有其他事务在会话中运行的线程。＆＃34;

Answer 1

尝试使用：

IList<ProductStatistics> str = from a db.ProductStatisticsTemp select a;
foreach (var val in str)
{

    // your code
}

您需要调用EF并尝试将其返回到该目标类型的IList<T>，然后我们可以在IList<T>上使用循环

您还可以查看相关的thread

消息=＆＃34;不允许新事务，因为会话中正在运行其他线程。＆＃34;

1 个答案: