Decorators in .NET Core with Dependency Injection

What is a Decorator? Feel free to skip this section if you're already familiar with the Decorator pattern The Decorator Pattern allows you to add functionality to an implementation of an interface by wrapping it in another implementation. e.g. interface IService { string GetValue(); } class DbService { public string GetValue() = "value from DB"; } class LoggingService { private readonly IService _concreteService; private readonly ILogger _logger; public LoggingService(IService concreteService, ILogger logger) { _concreteService = concreteService; _logger = logger; } public string GetValue() { _logger.LogInformation("Getting value"); var value = _concreteService.GetValue(); _logger.LogInformation("Retrieved {0}", value); return value; } } We have a concrete implementation of an IService interface (DbService) that returns a string value. LoggingService then decorates that implementation by wrapping invocation of the concrete instance and logging entry and exit. This pattern is very useful when you want to augment either your own or framework types with some new behaviour such as logging or exception handling.

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.NET Core,c#,Development,decorator,design-patterns,software-development