The instance of entity type 'manager' cannot be tracked because another instance with the same key value for {'id'} is already being tracked. When attaching existing entities, ensure that only one ent
最近在用ASP.NET CORE时遇到一些问题，现记录下：
出现上述错误，即在更新实体数据时出现的错误
services.AddDbContext<StoreContext>(c =>
c.UseInMemoryDatabase(Guid.NewGuid().ToString()).UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking));
The instance of entity type 'manager' cannot be tracked because another instance with the same key value for {'id'} is already being tracked. When attaching existing entities, ensure that only one ent的更多相关文章
- The instance of entity type 'xxxx' cannot be tracked because another instance with the same key value for {'Id'} is already being tracked.
一.问题描述 问题:The instance of entity type 'xxxx' cannot be tracked because another instance with the sam ...
- The instance of entity type 'Menu' cannot be tracked because another instance with the same key value for {'Id'} is already being tracked.
这里记录一个在使用.net core中ef core执行数据库操作时遇到的问题: 我在代码中使用DbContext下的Update方法准备将更改后的数据像这样步到数据库: _context.Menus ...
- EF 更新实体 The instance of entity type 'BabyEvent' cannot be tracked because another instance
加上AsNoTracking. 人不能两次踏入同一条河. 我 就踏入了.o(╥﹏╥)o
- [转] EF cannot be tracked because another instance of this type with the same key is already being tracked
本文转自:http://stackoverflow.com/questions/6033638/an-object-with-the-same-key-already-exists-in-the-ob ...
- type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds int,java.lang.Object
今天在进行代码检查的时候出现下面的异常: type parameters of <T>T cannot be determined; no unique maximal instance ...
- The entity type XXX is not part of the model for the current context.
今天遇到了一个奇葩问题,虽然解决了,但还是一脸懵,先附赠一下别人的解决方案:https://www.cnblogs.com/zwjaaron/archive/2012/06/08/2541430.ht ...
- Flask - 访问返回字典的接口报错：The view function did not return a valid response. The return type must be a string, tuple, Response instance, or WSGI callable, but it was a dict.
背景 有一个 Flask 项目,然后有一个路由返回的是 dict 通过浏览器访问,结果报错 关键报错信息 TypeError: 'dict' object is not callable The vi ...
- Entity Framework 6如何进行导航属性的筛选（context.Msg.First(t=>t.Id==1).Include(t=>t.MsgDetail)，筛选MsgDetail带条件）
问题: https://q.cnblogs.com/q/98333/ Msg表(Id,Content,IsDel).内有 virtual ICollection<MsgDetail> Ms ...
- The entity type <type> is not part of the model for the current context
这是在网站里遇到的一个错误,自动生成的不能手动添加, reference: http://stackoverflow.com/questions/19695545/the-entity-type-xx ...
随机推荐
- EL表达式详细教程
EL 全名为Expression Language EL 语法很简单,它最大的特点就是使用上很方便.接下来介绍EL主要的语法结构: ${sessionScope.user.sex} 所有EL都是以${ ...
- python 常用模块介绍
1.定义 模块:用来从逻辑上组织python代码(变量.函数.类,逻辑),本质就是.py结尾的python文件(文件名:test.py,对应的模块名:test). 包:用来从逻辑上组织模块的,本质就是 ...
- 【转载】[基础知识]【网络编程】TCP/IP
转自http://mc.dfrobot.com.cn/forum.php?mod=viewthread&tid=27043 [基础知识][网络编程]TCP/IP iooops 胖友们楼主我又 ...
- L53-Maximum-Subarray
题目描述 Find the contiguous subarray within an array (containing at least one number) which has the lar ...
- React之mockjs+sass+生命周期函数
mdn W3C标准网站 运行sass cnpm i -D node-sass-chokidar npm-run-all rem单位设置 <script> //rem单位设置 documen ...
- [Statistics] Comparison of Three Correlation Coefficient: Pearson, Kendall, Spearman
There are three popular metrics to measure the correlation between two random variables: Pearson's c ...
- ArrayList集合不能使用foreach增加、删除、修改元素的原因
大家先看两段代码 第一段代码: List<String> arrayList1 = new ArrayList<String>(); arrayList1.add(" ...
- 我折腾的shell笔记
目录 Mac一些常用的快捷键记录 iTerm2或者命令行相关 Mac桌面上或者某目录下操作 一些实用脚本示例 代码无提示或者其他抽风症状,清除Xcode缓存 查看当前网络ip地址 日常提交推送git代 ...
- @常见的远程服务器连接工具：Xshell与secureCRT的比较！！！（对于刚接触的测试小白很有帮助哦）
现在比较受欢迎的终端模拟器软件当属xshell和securecrt了. XShell绝对首选,免费版也没什么限制,随便改字体随便改颜色随便改大小随便改字符集,多窗口,也比较小巧,而SecureCRT界 ...
- 一套代码同时支持.NET Framework和.NET Core
转自:https://www.cnblogs.com/tianqing/p/11614303.html 在.NET Core的迁移过程中,我们将原有的.NET Framework代码迁移到.NET C ...