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How can we inject the service dependency into the controller C# Asp.net Core?
ASP.NET Core injects objects of dependency classes through constructor or method by using built-in IoC container.
The built-in container is represented by IServiceProvider implementation that supports constructor injection by default. The types (classes) managed by built-in IoC container are called services.
In order to let the IoC container automatically inject our application services, we first need to register them with IoC container.
Example
public interface ILog{
void info(string str);
}
class MyConsoleLogger : ILog{
public void info(string str){
Console.WriteLine(str);
}
}ASP.NET Core allows us to register our application services with IoC container, in the ConfigureServices method of the Startup class. The ConfigureServices method includes a parameter of IServiceCollection type which is used to register application services
Register ILog with IoC container in ConfigureServices() method as shown below.
public class Startup{
public void ConfigureServices(IServiceCollection services){
services.AddSingleton<ILog, MyConsoleLogger>();
}
}Add() method of IServiceCollection instance is used to register a service with an IoC container
We have specified ILog as service type and MyConsoleLogger as its instance This will register ILog service as a singleton Now, an IoC container will create a singleton object of MyConsoleLogger class and inject it in the constructor of classes wherever we include ILog as a constructor or method parameter throughout the application.
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