2、手写Unity容器--第一层依赖注入

这个场景跟《手写unity容器--极致简陋版unity容器》不同，这里构造androidphone的时候，androidphone依赖于1个ipad

1、iphone接口

namespace simplestunity_onelayer
{
    interface iphone
    {
        void call();
    }
}

2、androidphone实现

namespace simplestunity_onelayer
{
    public class androidphone : iphone
    {
        public androidphone()
        {
            console.writeline("{0}构造函数", this.gettype().name);
        }
    }
}

3、ipad接口

namespace simplestunity_onelayer
{
    public interface ipad
    {
        void show();
    }
}

4、ipad实现

namespace simplestunity_onelayer
{
    public class androidpad:ipad
    {
        public androidpad()
        {
            console.writeline("{0}构造函数", this.gettype().name);
        }

        public void show()
        {
            console.writeline("看{0}", this.gettype().name);
        }
    }
}

5、容器--接口

public interface idavidcontainer
{
    void registertype<tfrom, tto>();
    
    t resolve<t>();
}

6、容器--实现

namespace simplestunity_onelayer
{
    /// <summary>
    /// 容器--工厂
    /// </summary>
    public class daivdcontainer:idaivdcontainer
    {
        private dictionary<string, type> containerdictionary = new dictionary<string, type>();//字典

        /// <summary>
        /// 注册类型
        /// </summary>
        /// <typeparam name="tfrom"></typeparam>
        /// <typeparam name="tto"></typeparam>
        public void registertype<tfrom, tto>()
        {
            containerdictionary.add(typeof(tfrom).fullname, typeof(tto));
        }

        /// <summary>
        /// 获取实例
        /// </summary>
        /// <typeparam name="t"></typeparam>
        /// <returns></returns>
        public t resolve<t>()
        {
            type type = containerdictionary[typeof(t).fullname];
            //1、得到类型的所有构造函数
            constructorinfo[] ctorarray = type.getconstructors();

            //2、只得到有标记davidinjectionconstructor特性的构造函数，如果都没有标记特性，那么得到参数最多的构造函数
            constructorinfo currentctor = null;

            if (ctorarray.count(c => c.isdefined(typeof(davidinjectionconstructor), true)) > 0)
            {
                currentctor = ctorarray.firstordefault(c => c.isdefined(typeof(davidinjectionconstructor), true));//得到第1个标记davidinjectionconstructor特性的构造函数
            }
            else
            {
                currentctor = ctorarray.orderbydescending(c => c.getparameters().length).firstordefault();//得到参数个数最多的构造函数
            }
            list<object> paralist = new list<object>();
            
            foreach (var para in currentctor.getparameters())
            {
                //得到的参数类型是ipad，抽象无法创建实例
                var paratype = para.parametertype;
                //所以根据ipad key，得到androidpad类型，具体类型就可以创建实例
                var targetparatype = containerdictionary[paratype.fullname];
                paralist.add(activator.createinstance(targetparatype));
            }
            return (t)activator.createinstance(type,paralist.toarray());
        }
    }
}

7、调用

namespace simplestunity_onelayer
{
    class program
    {
        static void main(string[] args)
        {
            daivdcontainer davidcontainer = new daivdcontainer();
            davidcontainer.registertype<iphone, androidphone>();
            davidcontainer.registertype<ipad, androidpad>();
            iphone iphone = davidcontainer.resolve<iphone>();
            iphone.call();
        }
    }
}