装饰者模式 在依赖注入中体现

Decorator in Dependency Injection

    public interface IReportServer
    {
        void PrintReport();
    }
    public class ReportService : IReportServer
    {
        public void PrintReport()
        {
            Console.WriteLine("Printing...");
        }
    }
    public class ReportServiceWithLogging : IReportServer
    {
        private readonly IReportServer reportServer;

        public ReportServiceWithLogging(IReportServer reportServer)
        {
            this.reportServer = reportServer;
        }

        public void PrintReport()
        {
            Console.WriteLine("Begining.");
            reportServer.PrintReport();
            Console.WriteLine("Ending.");
        }
    }



    class Program
    {
        static void Main(string[] args)
        {
            var container = new ContainerBuilder();
            container.RegisterType<ReportService>().Named<IReportServer>("report");
            container.RegisterDecorator<IReportServer>(
                (context,server)=>new ReportServiceWithLogging(server), "report"
                );
            using (var cb=container.Build())
            {
                var report= cb.Resolve<IReportServer>();
                report.PrintReport();
            }

        }
    }