[已解決]There is already an open DataReader associated with this Connection which mu

今天程序報錯：There is already an open DataReader associated with this Connection which mu……

解決方案：在報錯方法之前使用了一個未釋放的IQueryable類型，

例如：dbContext.User.Where(x=>x.Age== 18);

需要釋放掉上面的DataReader，後面轉ToList（）即可。

dbContext.User.Where(x=>x.Age== 18).ToList();