dependency-injection

问题 How to inject services without registering them? I mean in the past some DI frameworks automatically registered Service for IService . I'm in a situation where I have a dozen of services and basically registering every single one is a pain in the ass. so is this supported in asp.net core default DI framework? 回答1: The out-of-the-box DI doesn't support it and do not intend to do so. The built-in IoC Container is kept simple by design, to allow basic dependency injection which works for most

问题 How to inject services without registering them? I mean in the past some DI frameworks automatically registered Service for IService . I'm in a situation where I have a dozen of services and basically registering every single one is a pain in the ass. so is this supported in asp.net core default DI framework? 回答1: The out-of-the-box DI doesn't support it and do not intend to do so. The built-in IoC Container is kept simple by design, to allow basic dependency injection which works for most

问题 Since Java EE 5 does not have CDI, how does DI work in here? Can an EJB be injected with @EJB in a class that is a non-EJB? Can an EntityManager be injected with @PersistenceContext in a class that is a non-EJB (container managed not resource local EntityManager )? Or the only solution to bring the resources in non-EJB classes is by JNDI lookup? By non-EJB class I mean a class that is not annotated with @Stateless / @Statefull or others. 回答1: Taken from: http://www.oracle.com/technetwork

问题 There is an answer here: How do I pass a dependency to a Serilog Enricher? which explains you can pass an instance in. However to do that I would need to move my logger setup after my dependency injection code has ran (in the startup.cs ) This means that startup errors won't be logged because the logger won't be ready yet. Is there a way to somehow configure serilog to run in my Main() method, but also enrich data with a DI item? The DI item has further dependencies (mainly on database

问题 There is an answer here: How do I pass a dependency to a Serilog Enricher? which explains you can pass an instance in. However to do that I would need to move my logger setup after my dependency injection code has ran (in the startup.cs ) This means that startup errors won't be logged because the logger won't be ready yet. Is there a way to somehow configure serilog to run in my Main() method, but also enrich data with a DI item? The DI item has further dependencies (mainly on database

问题 There is an answer here: How do I pass a dependency to a Serilog Enricher? which explains you can pass an instance in. However to do that I would need to move my logger setup after my dependency injection code has ran (in the startup.cs ) This means that startup errors won't be logged because the logger won't be ready yet. Is there a way to somehow configure serilog to run in my Main() method, but also enrich data with a DI item? The DI item has further dependencies (mainly on database

问题 There is an answer here: How do I pass a dependency to a Serilog Enricher? which explains you can pass an instance in. However to do that I would need to move my logger setup after my dependency injection code has ran (in the startup.cs ) This means that startup errors won't be logged because the logger won't be ready yet. Is there a way to somehow configure serilog to run in my Main() method, but also enrich data with a DI item? The DI item has further dependencies (mainly on database

问题 There is an answer here: How do I pass a dependency to a Serilog Enricher? which explains you can pass an instance in. However to do that I would need to move my logger setup after my dependency injection code has ran (in the startup.cs ) This means that startup errors won't be logged because the logger won't be ready yet. Is there a way to somehow configure serilog to run in my Main() method, but also enrich data with a DI item? The DI item has further dependencies (mainly on database

问题 I tried to inject IConfiguration into the migration (in constructor), and got exception: "No parameterless constructor defined for this object." any workaround? 回答1: you cannot, the migrations need to be able to run outside the context of your application. Since the Entity-framework command-line tool analyzes your code but does not run the startup.cs class. Also it is not advisable. your migrations should be plain simple and not depend on anything. if it would, it could lead to major runtime

问题 I tried to inject IConfiguration into the migration (in constructor), and got exception: "No parameterless constructor defined for this object." any workaround? 回答1: you cannot, the migrations need to be able to run outside the context of your application. Since the Entity-framework command-line tool analyzes your code but does not run the startup.cs class. Also it is not advisable. your migrations should be plain simple and not depend on anything. if it would, it could lead to major runtime