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添加到连接字符串的提供程序部分
"SqlServerConnection": "Server=.\\sqlexpress;Database=test;Integrated Security=True;Connect Timeout=15;MultipleActiveResultSets=true",
There is already an open DataReader associated with this Command which must be closed first的更多相关文章
- 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 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 ...
- C#.net mysql There is already an open datareader associated with this command引发的问题
[参考]There is already an open datareader associated with this command引发的问题 我在语句中并未使用 DataReader,未何也提示 ...
- EF There is already an open DataReader associated with this Command
捕捉到 System.InvalidOperationException _HResult=-2146233079 _message=意外的连接状态.在使用包装提供程序时,请确保在已包装的 DbCon ...
- There is already an open DataReader associated with this Connection which must be closed first EF
废话不多说,直接 上图,及解决办法.不过问题还不是太清楚到底为什么会出现这个情况..........
随机推荐
- 02-cmake语法-if、条件表达
格式: if(expression) # then section. COMMAND1(ARGS ...) COMMAND2(ARGS ...) ... elseif(expression2) # e ...
- python27期day17：re、logging日志模块、作业。
1.re: 正则就是用一些具有特殊含义的符号组合到一起(称为正则表达式)来描述字符或者字符串的方法.或者说:正则就是用来描述一类事物的规则.(在Python中)它内嵌在Python中,并通过 re 模 ...
- USACO Buying Hay
洛谷 P2918 [USACO08NOV]买干草Buying Hay https://www.luogu.org/problem/P2918 JDOJ 2592: USACO 2008 Nov Sil ...
- Linux构建DNS主从服务器
所有服务器:iptables -Fsystemctl stop firewalldsetenforce 0 配置yum 主服务器:[root@localhost ~]# yum -y install ...
- JVM系列之三：类装载器子系统
0. JVM架构图 Java虚拟机主要分为五大模块:类装载器子系统.运行时数据区.执行引擎.本地方法接口和垃圾收集模块. 1. 类的加载 虚拟机类装载器子系统:虚拟机把描述类的数据从class文件加载 ...
- Elasticsearch由浅入深（三）document的核心元数据、Id、_source元数据、全量替换、强制创建以及删除机制
document的核心元数据 document的核心元数据有三个:_index._type._id 初始化数据: PUT test_index/test_type/ { "test_cont ...
- Qt Quick小项目 - 登陆界面
开发环境: win8 + Qt5.11.2 说明: 用 QML 设计一个应用的登陆界面. 效果图: 新建一个 "Qt Quick Application - empty" 工程,分 ...
- C/C++深度优先搜索(递归树模拟)
//C++深度优先搜索(递归树模拟) #define _CRT_SECURE_NO_WARNINGS #include <iostream> #define MAX_N 1000 usin ...
- 在linux上安装taiga
# taiga 安装配置 1.简介 本文档介绍了如何部署完整的Taiga服务(每个模块都是Taiga平台的一部分). Taiga平台由三个主要组件组成,每个组件在编译时和运行时都有自己的依赖关系: t ...
- Docker修改已创建容器端口映射
修改已创建容器端口映射. 通过编辑 hostconfig.json 文件来修改 Docker 容器的端口映射 该文件地址:/var/lib/docker/containers/[hash_of_the ...