There is already an open DataReader associated with this Connection which must be closed first EF
There is already an open DataReader associated with this Connection which must be closed first EF的更多相关文章
- There is already an open DataReader associated with this Connection which must be closed first
使用MVC4 EF Linq获取foreach列表循环的时候遇到了如下的问题:报错提示 There is already an open DataReader associated with this ...
- There is already an open DataReader associated with this Command which must be closed first." exception in Entity Framework
Fixing the "There is already an open DataReader associated with this Command which must be clos ...
- 在实体对象中访问导航属性里的属性值出现异常“There is already an open DataReader associated with this Command which must be closed first”
在实体对象中访问导航属性里的属性值出现异常“There is already an open DataReader associated with this Command which must be ...
- 关于MultipleActiveResultSets属性导致的There is already an open DataReader associated with this Command which must be closed first的解决方法
执行SqlDataReader.Read之后,如果还想用另一个SqlCommand执行Insert或者Update操作的话,会得到一个错误提示:There is already an open Dat ...
- 多线程下，多次操作数据库报错，There is already an open DataReader associated with this Command which must be closed first.
原文:https://www.cnblogs.com/sdusrz/p/4433108.html 执行SqlDataReader.Read之后,如果还想用另一个SqlCommand执行Insert或者 ...
- error 'there is already an open datareader associated with this command which must be closed first'
This can be easily solved by allowing MARS in your connection string. Add MultipleActiveResultSets=t ...
- There is already an open DataReader associated with this Command which must be closed first
通常出现在嵌套查询数据库(比如在一个qry的遍历时,又进行了数据库查询) 通过在连接字符串中允许MARS可以轻松解决这个问题. 将MultipleActiveResultSets = true添加到连 ...
- static，你还敢用吗？(二）
为了压系统,昨天小组在测试环境模拟了一大批订单数据.今天上午查看记录的账单计息日志,发现了一大堆的MySqlException MySql.Data.MySqlClient.MySqlExceptio ...
- 使用OData技术遇到的问题及解决办法
“System.NotSupportedException”类型的未经处理的异常在 Microsoft.Data.Services.Client.dll 中发生 其他信息: 对此 POST 请求的响应 ...
随机推荐
- 【Leetcode链表】移除链表元素（203）
题目 删除链表中等于给定值 val 的所有节点. 示例: 输入: 1->2->6->3->4->5->6, val = 6 输出: 1->2->3-&g ...
- poj 2229 【完全背包dp】【递推dp】
poj 2229 Sumsets Time Limit: 2000MS Memory Limit: 200000K Total Submissions: 21281 Accepted: 828 ...
- execute和submit的区别与联系
execute和submit都属于线程池的方法,execute只能提交Runnable类型的任务,而submit既能提交Runnable类型任务也能提交Callable类型任务. execute会直接 ...
- 2018-8-10-win10-uwp-如何创建修改保存位图
title author date CreateTime categories win10 uwp 如何创建修改保存位图 lindexi 2018-08-10 19:16:50 +0800 2018- ...
- 2019-7-20-win10-uwp-使用-msbuild-命令行编译-UWP-程序
title author date CreateTime categories win10 uwp 使用 msbuild 命令行编译 UWP 程序 lindexi 2019-07-20 21:56:2 ...
- RDS MySQL 8.0 语句级并发控制
RDS MySQL 8.0 语句级并发控制 背景 为了应对突发的数据库请求流量,资源消耗过载的语句访问,SQL 访问模型的变化, 并保持 MySQL 实例持续稳定运行,AliSQL 版本设计了基于语句 ...
- oracle函数 decode(条件,值1,翻译值1,值2,翻译值2,...值n,翻译值n,缺省值)
[功能]根据条件返回相应值 [参数]c1, c2, ...,cn,字符型/数值型/日期型,必须类型相同或null 注:值1……n 不能为条件表达式,这种情况只能用case when then end解 ...
- css3制作动画性能问题
这篇文章主要讲的是怎样制作流畅动画,特别是针对移动端.在这里我首先介绍制作动画的几种方法的优缺点:接着会着重介绍用css3制作动画的注意事项. 1.用canvas.css3.jquery制作动画 Ca ...
- 模板—BSGS
#include<iostream> #include<cstdio> #include<cmath> #include<map> #define LL ...
- Android 设置ImageView宽度固定，其高度按比例缩放适应
今天和项目经理对喷了一下,他说在应用的列表数据中的图片应该宽度固定,高度按比例缩放自适应,我说,那岂不是很丑!直接让运营那边把图片处理成固定宽高比不就好了,省的我客户端麻烦了. 这家伙不同意,为毛呢, ...