.net core 【二】

using System;
using System.Collections.Generic;
using System.Text;

namespace General.Core
{
    //系统的引擎接口
    public interface IEngine
    {
        /// <summary>
        /// 构建一个实例
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        T Resolve<T>() where T : class;
    }
}

using System;
using System.Collections.Generic;
using System.Text;

namespace General.Core
{
    //系统的引擎接口
    public interface IEngine
    {
        /// <summary>
        /// 构建一个实例
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        T Resolve<T>() where T : class;
    }
}

using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Runtime;
using System.Text;

namespace General.Core
{
    public class EnginContext
    {
        private static IEngine _engine;

        /// <summary>
        /// 静态方法的形式去构造出一个对象
        /// </summary>
        /// <param name="engine"></param>
        /// <returns></returns>
        /// 该方法就是保证每次只有一个
        [MethodImpl(MethodImplOptions.Synchronized)]
        public static IEngine Initialize(IEngine engine)
        {
            if (_engine == null)
                _engine = engine;
            return _engine;
        }

        /// <summary>
        /// 当前引擎
        /// </summary>
        public static IEngine Current
        {
            get
            {
                return _engine;
            }
        }
    }
}

 // 添加对象
            EnginContext.Initialize(new GeneralEngine(services.BuildServiceProvider()));