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Fixing the "There is already an open DataReader associated with this Command which must be closed first." exception in Entity Framework 下面代码可能会报如标题所示错误 var contacts = from c in db.Contact select c; foreach (Contact c in contacts) { if (c.Phones.IsLoaded == false) c.Phones.Load(); if (c.Phones.Count > 0) { foreach (ContactPhone p in c.Phones){ } } } Tip: 真正执行查询是在foreach语句执行时才发生，在之前只是建立查询。 解决办法： 1，修改连接串，加上MultipleActiveResultSets=true <connectionStrings> <add name="connectionStrings" connectionString="Data Source=(local);Initial Catalog=xxx;uid=xx;pwd=xx;MultipleActiveResultSets=true"

一、如何让Intenal成员暴露给另一个程序集 我们知道Modifier为Internal的类型成员仅限于当前程序集能够访问，但是在某些情况下，我们希望将它们暴露给另一个程序集。比较典型的应用场景包括如下两种： 将一个组件或者模块定义成两个或者两个以上程序集，一个程序集需要访问另一个程序集的Internal成员 。比如将一个Logging组件定义成三个程序集：Logging.dll、Logging.Client.dll和Logging.Server.dll。其中后两个分别用于客户端和服务端的日志记录，而它们共同依赖的功能定义在Logging.dll中。定义在Logging.dll的API以共有成员的形式公布出来，而一些仅仅需要被Logging.Client.dll和Logging.Server.dll使用的API在定义成Interna成员。 对一个组件或者模块进行单元测试时候，单元测试用例需要调用定义在被测试组件或者模块的Internal成员 。 举个例子，如下图所示： 我将某个组件定义在Lib项目中，而Test是与之对应的单元测试项目。定义在Lib中组建成员的可见性依赖于具体的设计，但是在很多情况下，单元测试用例为了尽可能覆盖较多的分支，需要调用一些Internal成员。比如，设置一些Internal属性，或者调用一些Internal方法。

/*--> */ /*--> */ OP - OF - PAGE . WRITE : / '考试页-页眉' . END-OF-PAGE . WRITE : / '考试页-页脚' . START-OF-SELECTION . FORMAT COLOR = 6 . WRITE : AT /1 ( 30 ) SY - ULINE . WRITE : AT /1 ( 1 ) SY -VLINE . WRITE : AT 2 ( 28 ) '考试' INVERSE ON CENTERED . WRITE : AT 30 ( 1 ) SY -VLINE . WRITE : AT /1 ( 30 ) SY - ULINE . FORMAT COLOR OFF . TYPES : BEGIN OF TYP_TAB , NAME TYPE CHAR20 , SEX TYPE CHAR4 , ASS TYPE P DECIMALS 2 , END OF TYP_TAB . DATA GT_TAB TYPE TABLE OF TYP_TAB . DATA GS_TAB TYPE TYP_TAB . GS_TAB -NAME = '张三' . GS_TAB -SEX = '男' . GS_TAB -ASS = '20000' . APPEND GS_TAB TO GT_TAB . GS_TAB -NAME

ass_s_ccp_ft:-108; ass_s_ccp_all:-108; ass_tag_ft:-105; ass_tag_all:-105; rept_port:9000; Q_value:0.005; R_value:0.01; fiter_do_track:1; print:1; Z_init:1.7; Z_error:1.5; maxoff_xy:10.5; maxoff_z:3.0; maxvel_xy:5.0; maxvel_z:1.0; maxgdop:1.0; maxangle:30.0; maxnlos:10; dx:0; dy:0; insert:0; maxtime_out:1.0; maxtime_off:0.00001; dmaxlen_tm:1.0; dmax_var:9.0; dmax_vel:5.0; prc_noise:1.0; Server_udp_read_port:9100; Server_tcp_read_port:9003; localip:192.168.2.200; 来源： https://www.cnblogs.com/herd/p/11912723.html

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This question is related to my another question: Doctrine2 gives me only first instance of related objects I came up with bidirectional association to try solve my old issue but now I have another problem. Schema [EDITED] : XYZ\Bundle\CitiesBundle\Entity\Cities: type: entity table: cities fields: id: id: true type: integer unsigned: false nullable: false generator: strategy: IDENTITY name: type: string length: 50 fixed: false nullable: false landarea: type: decimal nullable: false density: type: integer unsigned: false nullable: false

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I'm building a class that has a slightly asymmetric addition. Before the complaints come in, it's necessarily asymmetric. There is a conversion (operation that takes a bit of time) that has to happen when two objects are added together, and the conversion most naturally happens with respect to the right summand. To make this concrete, here's a generic example of what's going on... class Foo { char _fav ; int _prop ; public : const char fav () const { return _fav ;} const int prop () const ( return _prop ;} void changeFav ( char );

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I have a base class in one assembly and a large number of generated classes in another that inherit from the base class. Using protobuf-net (r282) to serialize a list of the base type fails when attempting to resolve the subclassType (line 248 of SerializerT.cs) because the subclass is not in the assembly of the base class. Moving the classes together is not a preferred option and it is rather important that I can pass around List. Here is my tagged base class. The included types are marked with ProtoMember(x) as required. [

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: After I installed VS11, I started to get the following error: Consider app.config remapping of assembly "FSharp.Core, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" from Version "2.0.0.0" [C:\Program Files (x86)\Reference Assemblies\Microsoft\FSharp\2.0\Runtime\v2.0\FSharp.Core.dll] to Version "4.0.0.0" [C:\Program Files (x86)\Reference Assemblies\Microsoft\FSharp\2.0\Runtime\v4.0\FSharp.Core.dll] to solve conflict and get rid of warning. C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1490,5): warning MSB3247:

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I do derive my entities from a base-class that provides tracking. Since User derives from TrackableBase and TrackableBase is associated with User , I get an error: "Unable to determine a valid ordering for dependent operations. Dependencies may exist due to foreign key constraints, model requirements or store generated values." Is this model just not possible, or am I doing something wrong? 回答1: Is CreatedByUser a nullable foriegn key? If not, you'll get a circular reference. related: circular dependency in entity framework /mikkel 文章来源: