如何从linq到实体查询获取toTraceString()？

Question

dynamic traceFile =  Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "\\EntityFrameworkTrace.log";                
var CurrentStock = (from s in DBViews.StockStatus
                    where s.ProductID != 10
                    orderby s.ProductName
                    select new
                    {
                        s.ProductID,
                        s.ProductName,
                        CurrentStock = s.TotalStocked - s.TotalSold,
                        s.CurrentSellingRate,
                        CashValue = (s.TotalStocked - s.TotalSold) * s.CurrentSellingRate,
                        s.LastStocked,
                        s.LastCostPrice,
                        s.LastQtyStocked
                    }).ToList();

File.AppendAllText(traceFile, CurrentStock.toTraceString());   
return CurrentStock.ToList();

如何从CurrentStock上获取toTraceString()在以下行？它没有得到解决

File.AppendAllText(traceFile,  CurrentStock.toTraceString()); 

Answer 1

你不能因为你已经调用过ToList- 它不是Linq-to-Entities查询而只是一个List实例.

试试这个:

var CurrentStock = (from s in DBViews.StockStatus
                    where s.ProductID != 10
                    orderby s.ProductName
                    select new
                    {
                        s.ProductID,
                        s.ProductName,
                        CurrentStock = s.TotalStocked - s.TotalSold,
                        s.CurrentSellingRate,
                        CashValue = (s.TotalStocked - s.TotalSold) * s.CurrentSellingRate,
                        s.LastStocked,
                        s.LastCostPrice,
                        s.LastQtyStocked
                    }); // No ToList here!

File.AppendAllText(traceFile, ((ObjectQuery)CurrentStock).ToTraceString());   
return CurrentStock.ToList();

顺便说一句.你为什么用dynamic而不是string？动态类型仅适用于有意义的特殊情况 - 事实并非如此.