This technique extends the Distinct approach, resolving the limitation of not being able to select or change the implementation at runtime. In this article Ill show you how to dynamically select a service from such an implementation in ASP.NET Core. The following code snippet shows how you can return instances of the FileLogger, DbLogger, and EventLogger classes depending on the service type selected at runtime. Needs some additional overhead of refactoring your code and class hierarchy but heavily simplifies the consumption of injected services. Also, there is no need of additional factory method to resolve the appropriate reminder service. Can you say that you reject the null at the 95% level? Why don't math grad schools in the U.S. use entrance exams? Please contact the developer of this form processor to improve this message. However, sitting a When seeking to inject the . The interface prescribes that the implementations provide a method to upload a file ( UploadFile) and a method to get the implementation name ( GetName ). While building an ASP.NET Core application, setting an IoC container for dependency injection is nearly inevitable. Extensions ; # endregion public static class Extensions { # region Static Methods public static IServiceCollection AddScoped < TService, TMetadata > ( this IServiceCollection services, TMetadata metadata) where TService : class { return services. This method is called when requesting the implementation by name from the DI container. Dependency Injection with Multiple Implementations in ASP.NET Core Original Edi Wang Friday, December 28, 2018 China Standard Time undefined Reads The built-in Dependency Injection (DI) in ASP.NET Core is very useful, but how do you deal with an interface has multiple implementations? Injecting multiple implementations with Dependency injection, https://media-www-asp.azureedge.net/media/44907/dependency-injection-golf.png?raw=true, Going from engineer to entrepreneur takes more than just good code (Ep. Let me know your thoughts. - Joe Audette In this article, I will show you. 5 Ways Selecting Injected Instance from Multiple Instances of Same One option is to directly inject the IServiceProvider interface to all the three controllers. Note that since logging data is not the objective of this article, the Write methods pertaining to each of these classes do not include any implementation. This is tricky. Injecting multiple implementations with Dependency injection This whole pattern is very straight forward to implement when you do not have a dependency injection container. Thanks for sharing your thoughts ! Registering multiple implementations of the same interface in ASP.NET Core Multiple implementations of an interface in .NET Core Dependency Injection Starting from it's initial release ASP .NET Core comes with built in dependency injection (DI) to help implement Inversion Of Control design pattern. I would love to hear from you about the approaches that you have used / planning to use. Where to find hikes accessible in November and reachable by public transport from Denver? Hence, if you want to inject any mocks instead of actual implementation, it would not be possible. .NET Core Dependency Injection-Using multiple implementations of the same interface July 20, 2022 On most of my projects I'm using Autofac as the Inversion of Control container of my choice. One piece of functionality the .NET DI container does not have (which is available in some other 3rd party DI/IoC containers) is the ability to add and retrieve service implementations by name. Another option is to have a method resolve appropriate dependency, based on some kind of key / token. Will it have a bad influence on getting a student visa? However, dealing with multiple implementations of an interface when working with dependency injection in ASP.NET. Do you have some additional ideas ? This is the last option that I am going to cover in this article. I blog about C#, .NET and Azure. One of the key features of ASP.NET Core is its use of dependency injection (DI). Then this interface should be injected in the controllers. 4 solutions for selective injection when the interface has multiple In the Startup.cs there are 3 essential changes to be made. Here, we need to implement all these three as . But in this particular case, where single interface has multiple implementations, it is not that straight forward. 503), Fighting to balance identity and anonymity on the web(3) (Ep. Create an IShoppingcart Interface having GetCart method. Why does sending via a UdpClient cause subsequent receiving to fail? Also added alternative to @JoeAudette's comment using. Just curious to know if there are any further side effects of such a scenario, other than our increased dependency on the container. To make use of dependency injection, a generic interface is created, IFileUploader, along with three implementations AWSUploader, AzureUploader and FTPUploader. For more advanced scenarios the users are encouraged to use an IoC of their choice which supports more advanced features (assembly scan, decorators, conditional/parameterized dependencies, etc. .NET Core Dependency Injection - One Interface, Multiple Implementations Instead of string token you might want to introduce Enum as a param input, in order to avoid mistyping. .NET EF Core - How to store enum to the database ? Resolve Multiple Types In ASP.NET Core | Khalid Abuhakmeh Dependency Injection error: Unable to resolve service for type while attempting to activate, while class is registered. The standard DI stuff worked as expected, however there was one situation where I had to investigate a little further. Also, using this pattern may result in more run-time errors, than compile time errors. dependency injection library java For example, if the index.html is on the server at /angularapp/index.html , the base href should be set to . If you dont already have a copy, you can download Visual Studio 2019 here. I usually add a method called ShouldProcess for these classes and run them all in a loop or set an enum for certain circumstances. Short of actually implementing one of these other 3rd party containers, below are a number of different options and techniques one can use to get the correct implementation from the DI container when there are multiple implementations registered. Consider the following enum that contains integer constants that correspond to the three types FileLogger, DbLogger, and EventLogger. This allows you to enrich your log messages with extra information in an easy way. Remark: If you want to have only one implementation registered for a specific interface, you can use the TryAdd methods available as part of the Microsoft.Extensions.DependencyInjection.Extensions namespace. More information: https://angular.io/guide/deployment --deploy-url A second parameter that is important is --deploy-url. We need to register it in DI and then use it in the constructor as parameter and thats it. Dependency Injection: Conditional Resolving Of Multiple Implementation ASP.NET Core ships with a default service location mechanism that may behave differently than the previous inversion of control (IoC) products. Many of us may not like it. Use this . What is the function of Intel's Total Memory Encryption (TME)? Of course, these are not the only options available. Stack Overflow for Teams is moving to its own domain! But the advantage is registering and resolving dependencies is consistent with rest of the application. Lastly, here is how you can use dependency injection in the constructor of your controller class and then resolve the service instance. A colleague asked me to take a look at the following code inside a test project: My first guess would be that this code checks that the specified condition(the contains) is true for every element in the list. This is a bonus tip. For this, we can define a delegate lets say ReminderServiceResolver. Run a GraphQL backend as an Azure Function. There are a number of new components here: The full definition of the classes (along with all other code) can be found on Github, here, Rollcall is a library (written by me) which extends the DistinctLookupFactory approach and makes it generic so that it will function with any interface and implementation. First off, lets create an ASP.NET Core Web Application MVC project in Visual Studio 2019. Slight performance overhead when compared to the non-generic method, and when compared DistinctFactoryHandler is defined as below: This approach gives implementations names as they are added to the DI container, keeps track of the name-implementation link, and facilitates lookup and retrieval of the correct implementation. Use multiple implementations of an interface in ASP.NET Core The below code snippet shows how the reminder service interface and implementations have been registered. The disadvantage of using this pattern is your code becomes hard to test. Rollcall Nuget package, The problem with .NET dependency injection container, Implementation can be selected/changed at runtime. Dealing with Multiple Implementations of a Service in ASP.NET - ABP Another "advanced" pattern that can be achieved is to register multiple concrete implementations for an interface. When your interface has a natural composite implementation, this is a good way to allow extension points. You can extrapolate from this and apply its own business requirements. Should one Interface have only one implementation? The ideas that I have mentioned here may not be usable as it is, but I am sure this article will provide you some ideas about how can you solve the problem at hand. That can be done by resolving an IEnumerable instance. So if ICar has some identifier property you could find the one you need in the list. Let's first discuss when and why you might want to do this. Now we are back to ConfigureServices method from the beginning of this article where for the same interface we register multiple class types. How to register multiple implementations of the same interface in Asp.Net Core? Lamar.Microsoft.DependencyInjection exposes the extension method UseLamar for the IWebHostBuilder, which needs to be called. container.RegisterType("Male"); namespace MultipleImplementation { Get all latest content delivered to your email a few times a month. You can create additional interfaces from IReminderService, one corresponding to each concrete implementation. A dependency is an object that another object depends on. When a single interface has single implementation, it is easy. So if ICar has some identifier property you could find the one you need in the list. Dependency Injection on Azure Functions: 5 Ways Selecting Instance from java lightweight dependency injection Ensure that Authentication is set to No Authentication as we wont be using authentication either. {{#message}}{{{message}}}{{/message}}{{^message}}Your submission failed. I'm currently working on a ASP.NET Core Project and want to use the built-in Dependency Injection (DI) functionality. 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