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
- 小爬爬1.requests基础操作
1.requests安装的问题 (1)如果requests没有安装,我们需要先安装这个模块,在cmd安装不了,我们可以在下面的位置,打开的窗体安装requests模块 pip install requ ...
- MaxCompute如何对SQL查询结果实现分页获取
由于MaxCompute SQL本身不提供类似数据库的select * from table limit x offset y的分页查询逻辑.但是有很多用户希望在一定场景下能够使用获取类似数据库分页的 ...
- MaxCompute 图计算开发指南
快速入门step by step MaxCompute Studio 创建完成 MaxCompute Java Module后,即可以开始开发Graph了. 代码示例 在examples目录下有gra ...
- 【转载】Ubuntu终端常用的快捷键
Ubuntu中的许多操作在终端(Terminal)中十分的快捷,记住一些快捷键的操作更得心应手.在Ubuntu中打开终端的快捷键是Ctrl+Alt+T.其他的一些常用的快捷键如下: 快捷键 功能 Ta ...
- 基本的Sql编写注意事项
基本的Sql编写注意事项 尽量少用IN操作符,基本上所有的IN操作符都可以用EXISTS代替. 不用NOT IN操作符,可以用NOT EXISTS或者外连接+替代. Oracle在执行IN子查询时,首 ...
- 2018-9-19-Roslyn-通过-Nuget-管理公司配置
title author date CreateTime categories Roslyn 通过 Nuget 管理公司配置 lindexi 2018-9-19 10:57:5 +0800 2018- ...
- deepin 15.11 升级docker-ce 18.01到19.03.1，升级docker compose 1.23到1.24.1
1.升级docker compose ,docker官方安装方法 $ sudo curl -L "https://github.com/docker/compose/releases/dow ...
- C#设置Excel行高、列宽
设置固定值 worksheet.Columns[1].ColumnWidth = 15; 设置自动换行 worksheet.Columns.WrapText = true; 设置自动行高.列宽 xlA ...
- Hbase数据模型 列族
- HZOJ visit
对于前30%的数据,可以考虑dp,f[i][j][k]表示时间为i,在i,j位置的方案数,枚举转移即可.要注意的是可以走到矩阵外. 对于另外30%数据,考虑推一下式子,设向右走y步,左z,上s,下x. ...