2012 年 12月 25 日随笔档案 - Season2009

2012年12月25日

Fixing the "There is already an open DataReader associated with this Command which must be closed first." exception in Entity Framework

摘要：下面代码可能会报如标题所示错误var contacts = from c in db.Contact select c;foreach (Contact c in contacts) { if (c.Phones.IsLoaded == false) c.Phones.Load(); if (c.Phones.Count > 0) { foreach (ContactPhone p in c.Phones){ } }}Tip: 真正执行查询是在foreach语句执行时才发生，在之前只是建立查询。解决办法：... 阅读全文

posted @ 2012-12-25 09:50 Season2009 阅读(613) 评论(0) 推荐(0)