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

  1. 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 ...

  2. 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 ...

  3. 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 ...

  4. 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 ...

  5. 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 ...

  6. 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 ...

  7. 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 ...

  8. 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 ...

  9. 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

  1. 01-人脸识别-基于MTCNN，框选人脸区域-detect_face_main

    (本系列随笔持续更新) 搭建要求 详细的搭建过程在 参考资料1 中已经有啦. TensorFlow 1.6.0 OpenCV 2.4.8 仅仅是加载和读取图片的需要 Ubuntu 14.04 64bi ...

  2. MySQL中DELETE子句与TRUNCATE TABLE语句的区别

    TRUNCATE语句删除表数据的语法格式:即,table 这个词可要,可不要 TRUNCATE TABLE 表名; TRUNCATE 表名; 1,使用truncate语句后,表中的auto_incre ...

  3. cerely-分布式异步任务队列

    Celery 是一个强大的 分布式任务队列 的 异步处理框架,它可以让任务的执行完全脱离主程序,甚至可以被分配到其他主机上运行.我们通常使用它来实现异步任务(async task)和定时任务(cron ...

  4. django -- admin里的配置

    前戏 Django给我们提供了一个后台管理系统,方便我们进行数据表的管理 创建超级用户 python manage.py createsuperuser 配置 默认我们登录到后台不显示任何一张表,如果 ...

  5. A1041 Be Unique (20 分)

    一.技术总结 这题在思考的时候遇见了,不知道怎么处理输入顺序问题,虽然有记录每个的次数,事后再反过来需要出现一次的且在第一次出现, 这时我们其实可以使用另一个数组用来存储输入顺序的字符,然后再用另一个 ...

  6. [LeetCode] 827. Making A Large Island 建造一个巨大岛屿

    In a 2D grid of 0s and 1s, we change at most one 0 to a 1. After, what is the size of the largest is ...

  7. [LeetCode] 26. Remove Duplicates from Sorted Array 有序数组中去除重复项

    Given a sorted array nums, remove the duplicates in-place such that each element appear only once an ...

  8. [LeetCode] 14. Longest Common Prefix 最长共同前缀

    Write a function to find the longest common prefix string amongst an array of strings. If there is n ...

  9. IDEA 最新破解方法，2019 版本已支持（持续更新，更新时间2019-05-14）

    一.安装进入官网下载适合自己系统的版本,下载地址:https://www.jetbrains.com/idea/download/#section=windows ​ 2. 安装中选择适合本机的64位 ...

  10. 外文投稿时应该如何填写有关Social Media的问题?

    外文投稿时应该如何填写有关Social Media的问题? 1 *Please supply our social media editor with a "tweet" or s ...