Service Locator 服务定位模式

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ServiceLocator
{
    class Program
    {
        static void Main(string[] args)
        {
            var conObj = (IConsoleIml)ServiceLocator.Loctory.GetServiceByType(typeof(IConsoleIml));
            conObj.Console("123");
            Console.Read();
        }
    }

    public sealed class ServiceLocator
    {
        private static readonly ServiceLocator locator = new ServiceLocator();
        private static readonly InitialContext initialContext = new InitialContext();
        public object GetServiceByType(Type serviceType)
        {
            return initialContext.GetService(serviceType);
        }
        public static ServiceLocator Loctory { get { return locator; } }
    }
    public class InitialContext
    {
        public Dictionary<Type, ServiceFactoryBase> dic = new Dictionary<Type, ServiceFactoryBase>();
        public InitialContext()
        {
            foreach (var item in this.GetType().Assembly.GetExportedTypes())
            {
                if (item.IsSubclassOf(typeof(ServiceFactoryBase)))
                {
                    var factory = (ServiceFactoryBase)Activator.CreateInstance(item);
                    dic.Add(factory.ServiceType, factory);
                }
            }
        }

        public object GetService(Type ServiceType)
        {
            var serviceFactory = dic[ServiceType];
            if (serviceFactory != null)
                return serviceFactory.GetService();
            throw new InvalidOperationException();
        }
    }
    public abstract class ServiceFactoryBase
    {
        private object serviceIml = null;
        public object GetService()
        {
            if (serviceIml == null)
            {
                serviceIml = this.DoGetservice();
            }
            return serviceIml;
        }
        protected abstract object DoGetservice();
        public abstract Type ServiceType { get; }
    }
    public class ConsoleFactory : ServiceFactoryBase
    {
        protected override object DoGetservice()
        {
            return new ConsoleIml();
        }

        public override Type ServiceType
        {
            get { return typeof(IConsoleIml); }
        }
    }
    public interface IConsoleIml
    {
        void Console(string content);
    }
    public class ConsoleIml : IConsoleIml
    {
        public void Console(string content)
        {
            System.Console.WriteLine(content);
        }
    }

}