adding this item as a reference in ASP.net will result in a circular dependency
A reference to "DAL" could not be added. Adding this item as a reference will result in a circular dependency. As shown in the following illustration:
There are several class libraries, the previous reference is not a problem, do the following, the reference error.Why is this happening, is not I cited too much, there is any
Sometimes, when we inject a dependency into the DAO layer, service layer, and action, we often prompt for null pointer exceptions, that is, injection failures. ..
This is every bit abnormal, normal use ~ ~ What is going on ... The reasons are as follows:
In the case of dependency injection, the injection of the DAO layer class is not the same as the action. A little bit different.
Our example explains the
Through the first two parts of learning, the acquisition of objects has been very simple, the previous use of the object to obtain the method to sum up, but also has not been used to supplement the method.
The method of getting an object in the Unity container also includes the generic method and the non-generic overload corresponding to it, where only the generic method is described.
Get an object from a type
We use the method resolve
Get objects based on type and name
Use method resolve
Label:What is dependency injection?We introduce the entity as a practical example as follows Public class Product
{
publicintgetset;}
Public string Get Set ; }
Public decimal Get Set ; }
}The EF implementation is as follows Public classProductcontext:dbcontext { PublicProductcontext ():Base("Productcontext")
{
}
PublicdbsetGet;Set; } }
Public classproductrepo_ef {PrivateProductcontext
Tags: size loader classes wrapper [] AAA style technology share one?But when you create a new Vue project, you need to reinstall stylus, or you can error:This dependency is not found:* !! Vue-style-loader!css-loader? {"Minimize": false, "Sourcemap": false}!.. /.. /node_modules/vue-loader/lib/style-compiler/index? {"Vue": true, "id": "data-v-1d57e5ea", "scoped": false, "Hasinlineconfig": False}!stylus-loader? {"Sourcemap": false}!.. /.. /node_modules/v
Springboot assembly characteristics (depending on the default assembly, there is a dependency on the assembly)
1,application in the mother bag
2, dependent files can not be misplaced, Springboot will be based on the default configuration of the integration well, with the profile of the refinement will be combined with the configuration file (dependency is configured)
For example, relying on CAs,
Tags: i386 error dependency list 6.2 sha file Ubuntu spanUbuntu want to install a QQ, helpless installation not only error, but also cause the software is now dependent on the problem正在读取软件包列表... 完成正在分析软件包的依赖关系树 正在读取状态信息... 完成 您也许需要运行“apt --fix-broken install”来修正上面的错误。下列软件包有未满足的依赖关系: libpng16-16 : 破坏: libpng16-16:i386 (!= 1.6.28-1) 但是 1.6.26-1 已经安装 libpng16-16:i386 : 破坏: libpng16-16 (!= 1.6.26-1) 但是 1.6.28-1 已经安装E: 有未能满足的依赖关系。请尝试不指明软件包的名字来
Minimum function Dependency SetI. Equivalence and coverageDefinition: The two dependency set F and G on the relational pattern r Second, minimum function dependency setDefinition: If the function dependency set F satisfies the following conditions, it is said that f is the minimum function
CLR attributes and dependency attributes
CLR attributes are very familiar to us and can be seen everywhere in DOTNET programming. The simplest and most common property accessors are private members who directly manipulate the class, as follows:Public class person{Private string _ name;Public string name{Get {return _ name ;}Set {_ name = value ;}}}C #3.0 provides the "Automatic attribute" feature for this common writing method, which facilitates waiti
Minimum function Dependency Set
I. Equivalence and coverage
Definition: The two dependency set F and G on the relational pattern r
Second, minimum function dependency set
Definition: If the function dependency set F satisfies the following conditions, it is said that f is the minimum function
First, the dependency property basic introductionThis article begins by learning about another important content dependency property of WPF.As you all know, WPF brings a lot of new features, one of which is the introduction of a new property mechanism-dependency properties. Dependency properties appear to be used to im
In spring, the dependencies of each module are described through a simple IOC configuration file, which centralizes and understands these externalities, and when we use other Component Services, we only need to understand and configure these dependencies in the configuration file, that is, the interface is concerned, and the specific implementation of the service, After using the interface definition to leave, it is not the focus of application development concern. For application development, y
It's possible that I've used Maven in Eclipse, and I've been searching in Search.maven and adding pom information.Today, when searching online, I found a solution to share here.First step, select Maven in Preferences, select "Download Repository index updates on startup"Step two, open the MAVEN repositoryThe third step, right-click on the global warehouse to select "Full Index Enabled"After the selection, MAVEN will download a nearly hundred index file, the download will update the index, the pr
Problem phenomenon:Vlc:depends:vlc-nox (= 3.0.0~~git20150319+r59816+33~ubuntu14.04.1) but will be installed 3.0.0~~git20150319+r59816+33~ ubuntu14.04.1Depends:libavcodec-extra-55 (>= 6:10~~git20131218.b3189af~ubuntu14.04.1) but unable to install%sDepends:libavutil53 (>= 6:9.1-1) but unable to install%sDepends:libegl1-x11 but it's a virtual package.DEPENDS:LIBGCC1 (>= 1:4.1.1) but will install 1:4.9.1-0UBUNTU1Depends:libgles1 but it's a virtual package.Depends:libgles2 but it's a virtual package.
Today, when attempting to update ADT Online (22 to 23), you encounter a problem that initially appears to be a referential conflict from the error prompt:It is estimated that everyone will encounter this problem when they upgrade 22 to 23, the new and old version of the conflict, it feels like ADT's own bug.In fact, there is a conflict between the plug-in currently being installed and the installed plug-in.Workaround: Uninstall the conflicting plugins, many people may not know how to uninstall t
are as follows:· Bytype assembly by type you can find the type-matching bean in the container based on the property type, if there are more than one, an exception is thrown, and if not found, the property value is null;· ByName by name the bean with the same property name can be queried in the container based on the name of the property, and if not found, the property value is null;· constructor is similar to the bytype approach, where it is applied to the constructor parameter, and throws an e
ClassLoader is Tomcat's WebappClassLoader, This time we find the path to the resource is an empty string. This class returns two URLs, one is ${webapps}/web-inf/classes, and the other is ${tomcat-home}/lib, strange, incredibly ${webapps }/web-inf/lib is not in the return URL, a bit magical, let's look!Public enumerationThis method is actually webappclassloader directly inherit the classload come over, Parentclassload actually find the time of the classpath of the Tomcat container is findresourc
It's possible that I've used Maven in Eclipse, and I've been searching in Search.maven and adding pom information.Today, when searching online, I found a solution to share here.First step, select Maven in Preferences, select "Download Repository index updates on startup"Step two, open the MAVEN repositoryThe third step, right-click on the global warehouse to select "Full Index Enabled"After the selection, MAVEN will download a nearly hundred index file, the download will update the index, the pr
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