.Net IOC理解及代码实现

IOC理解

IoC(Inversion of Control)：即控制反转，这是一种设计思想，指将对象的控制权交给IOC容器，由容器来实现对象的创建、管理，程序员只需要从容器获取想要的对象就可以了。DI(Dependency Injection)，即依赖注入，他是IoC的一种具体实现方式。

IOC代码实现

Model类

namespace IOCDemo.IOC
{[IOCService]internal class School{public string SchoolName { get; set; }public Student Student { get; set; }public void ShowMessage(){Console.WriteLine("创建School对象");Student.ShowMessage();}}internal class Student{public string StudentNo { get; set; }public string StudentName { get; set;}public void ShowMessage(){Console.WriteLine("创建Student对象");}}
}

IOC容器工程类

.Net8 IOC容器基本形态：
1、创建对象
2、存储对象 字典随机取对象，随机存对象性能高
3、获取对象
4、依赖注入(对象属性赋值)
5、对象过滤(特征)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;namespace IOCDemo.IOC
{/// <summary>/// IOC工程/// 1、创建对象/// 2、存储对象 字典随机取对象，随机存对象性能高/// 3、获取对象/// 4、依赖注入(对象属性赋值)/// 5、对象过滤(特征)/// 总结：完成.Net8 IOC容器基本形态/// </summary>internal class IOCFactory{private Dictionary<string,Object> IOCS = new Dictionary<string,Object>();public IOCFactory() {//不能直接new对象，违背开闭原则(对扩展开发，对修改关闭，如果有新的类，需要修改IOC工厂类)Assembly assembly = Assembly.Load("IOCDemo");Type[] types = assembly.GetTypes();foreach (Type t in types){IOCService service=t.GetCustomAttribute<IOCService>();//5、过滤if (service != null){//1、创建对象object obj = Activator.CreateInstance(t);//同样违背开闭原则//PropertyInfo propertyInfo = t.GetProperty("SchoolName");//if (propertyInfo != null)//{//    propertyInfo.SetValue(obj, new Student());//}//4、依赖注入PropertyInfo[] properties = t.GetProperties();foreach (var property in properties){foreach (var type in types){if (property.PropertyType.Equals(type)){object value = Activator.CreateInstance(type);property.SetValue(obj, value);}}}//2、存储对象IOCS.Add(t.FullName, obj);}}}/// <summary>/// 3、获取IOC对象/// </summary>/// <param name="name"></param>/// <returns></returns>public object GetObject(string name){return IOCS[name];}}
}

自定义特性类

namespace IOCDemo.IOC
{/// <summary>/// 自定义特性/// </summary>[AttributeUsage(AttributeTargets.Class)]internal class IOCService:Attribute{}
}

实现

using IOCDemo.IOC;IOCFactory iOCFactory = new IOCFactory();
School school = (School)iOCFactory.GetObject("IOCDemo.IOC.School");
school.ShowMessage();

输出

实例代码

https://download.csdn.net/download/lvxingzhe3/89967307