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Dependency Injection (DI) in C# is typically implemented in the following ways:

1. Through the constructor — dependencies are passed to the class via constructor parameters. This is the most common and recommended method.

public class Service {
    private readonly IRepository _repository;

    public Service(IRepository repository) {
        _repository = repository;
    }
}

2. Through properties (Property Injection) — dependencies are set via the class's properties.

public class Service {
    public IRepository Repository { get; set; }
}

3. Through methods (Method Injection) — dependencies are passed to methods that use them.

public class Service {
    public void Execute(IRepository repository) {
        // use of repository
    }
}

To manage dependencies, DI containers (e.g., Microsoft.Extensions.DependencyInjection) are often used, which automatically create and provide the necessary objects.

This way, dependency injection makes the code more modular, testable, and maintainable.