dependency-injection

问题 I've been learning Angular 2 for a few days now. When I read about the Injectable() concept in Angular 2 and try to apply the tutorial's example code in this link : Angular 2 - Dependency Injection, I get a problem. They said I need to put the annotation @Injectable() on top of the class so that the other classes can inject, like: import { Injectable } from '@angular/core'; @Injectable() export class appService { getApp(): string { return "Hello world"; } } The problem is that when I drop

问题 I`ve got simple class with strategies. public class LinkQualifier : ILinkQualifier { private readonly IEnumerable<IQualifier> _qualifiers; public LinkQualifier(IEnumerable<IQualifier> qualifiers) { _qualifiers = qualifiers; } public IQualifier Qualify(Uri uri) { return _qualifiers.FirstOrDefault(q => q.CanQualify(uri)); } } How i can register it in MVC core DI container? I invented something like this: services.AddTransient<ILinkQualifier, LinkQualifier>((ctx => { var qualifiers = new List

问题 I'm trying to load some settings from the appsettings file and I've got a small issue with the way lists are loaded when using the options pattern. Suppose I've got the following classes (for loading the settings): public class Application { public string Name { get; set; } = ""; public IEnumerable<string> Roles { get; set; } = new[] {""}; public Application ToApplicationWithoutPass() => new Application { Name = Name, Username = Username, Roles = Roles.ToList() }; } public class Applications

问题 I need to access session variable in ConfigureService method in ASP.NET Core 1.0 using IServiceProvider. I have a service that is initialized with delegate/lambda expression that can return value from any place. In this context this lambda expression argument should return value from session once called. Here is example code: public void ConfigureServices(IServiceCollection services) { services.AddTransient<IMyService>(serviceProvider => { return new MyService(() => { var session =

问题 I need to access session variable in ConfigureService method in ASP.NET Core 1.0 using IServiceProvider. I have a service that is initialized with delegate/lambda expression that can return value from any place. In this context this lambda expression argument should return value from session once called. Here is example code: public void ConfigureServices(IServiceCollection services) { services.AddTransient<IMyService>(serviceProvider => { return new MyService(() => { var session =

问题 I am new with the dependency injection pattern. I'm a little confused about few things. Scenario: I have a class library project called 'MailCore'. This project has interfaces and classes that perform all email sending stuff. I have an MVC project called 'The site'. It uses the 'MailCore' project to send email. I have Unity in this project and the UnityContainer is registered and things are working fine. I also have another class library library project called 'SiteRepo'. Sometimes, to

问题 Does anyone know what technique spring uses to achieve dependency injection at runtime? Does it simply use aspects (AOP) or is it something more complicated? 回答1: Spring does a lot of things, but dependency injection itself is actually a surprisingly simple mechanism. It starts with having a registry for classes that are available for injection. Classes that are added to this registry are examined using reflection. A DI framework will look for relevant annotations and constructors to

问题 Does anyone know what technique spring uses to achieve dependency injection at runtime? Does it simply use aspects (AOP) or is it something more complicated? 回答1: Spring does a lot of things, but dependency injection itself is actually a surprisingly simple mechanism. It starts with having a registry for classes that are available for injection. Classes that are added to this registry are examined using reflection. A DI framework will look for relevant annotations and constructors to

问题 I have this problem implementing a custom login authentication using SpringBoot and SpringBoot-Security. I made a Bitbucket repository as reference for this thread (within CustomSecuringWeb branch). Before anything else, most of the comments here follows the Securing a Web Application tutorial. The thing is, I was curious as how could the authentication data is now from the database instead of just memory data (which is very common in production line applications). Throughout the process I

问题 I'm using Dagger in a Java library module in an Android Studio project and here's what my build.gradle for the module looks like: apply plugin: 'java-library' dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'com.google.dagger:dagger:2.24' annotationProcessor 'com.google.dagger:dagger-compiler:2.24' } sourceCompatibility = "7" targetCompatibility = "7" I can see that the Dagger is properly generating implementations and they are present in build/generated