Autofac支持属性注入

一、支持属性注入

1、创建控制台程序

2、Nuget引入AutoFace

3、创建接口层Business.IServices，包含以下几个接口

IMicrophone.cs

1 namespace Business.IServices
2 {
3     public interface IMicrophone
4     {
5        
6     }
7 }

IPower.cs

1 namespace Business.IServices
2 {
3     public interface IPower
4     {
5     }
6 }

IHeadphone.cs

1 namespace Business.IServices
2 {
3     public  interface IHeadphone
4     {
5     }
6 }

4、创建具体类层，分别继承上面接口

Microphone.cs

 1 using Business.IServices;
 2 
 3 namespace Business.Services
 4 {
 5     public class Microphone : IMicrophone
 6     {
 7         public Microphone()
 8         {
 9             Console.WriteLine($"{this.GetType().Name}被构造..");
10         }
11     }
12 }

Power.cs

 1 using Business.IServices;
 2 
 3 namespace Business.Services
 4 {
 5     public class Power :IPower
 6     {
 7         
 8         public Power(IMicrophone microphone)
 9         {
10             Console.WriteLine($"{this.GetType().Name}被构造了");
11         }
12 
13         public Power(IMicrophone microphone, IMicrophone microphone2)
14         {
15             Console.WriteLine($"{this.GetType().Name}被构造了");
16         }
17     }
18 }

Headphone.cs

 1 using Business.IServices;
 2 
 3 namespace Business.Services
 4 {
 5     public class Headphone : IHeadphone
 6     {
 7         public IMicrophone microphone { get; set; }
 8         
 9         public Headphone(IPower power)
10         {
11             Console.WriteLine($"{this.GetType().Name}被构造...");
12         }
13     }
14 }

5、修改Program.cs

 1 {
 2     //属性注入
 3     ContainerBuilder containerBuilder = new ContainerBuilder();
 4     containerBuilder.RegisterType<Microphone>().As<IMicrophone>();
 5     containerBuilder.RegisterType<Power>().As<IPower>();
 6     containerBuilder.RegisterType<Headphone>().As<IHeadphone>();
 7     containerBuilder.RegisterType<Headphone>().As<IHeadphone>().PropertiesAutowired(); //支持属性注入
 8     IContainer container = containerBuilder.Build();
 9     IHeadphone headphone = container.Resolve<IHeadphone>();   
10 }

 

6、设置断点，执行程序

可以发现属性public IMicrophone microphone { get; set; }被创建

 二、指定属性才能注入

以上方法是所有属性都可以注入，我们可以指定有标识的属性才注入

1、创建CustomSelectAttribute

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace Business.FrameWork.AutofacExt
 8 {
 9     [AttributeUsage(AttributeTargets.Property)]  //只能用在属性上
10     public class CustomSelectAttribute : Attribute
11     {
12 
13     }
14 }

2、创建CustomPropertySelector

 1 using Autofac.Core;
 2 using System;
 3 using System.Collections.Generic;
 4 using System.Linq;
 5 using System.Reflection;
 6 using System.Text;
 7 using System.Threading.Tasks;
 8 
 9 namespace Business.FrameWork.AutofacExt
10 {
11     public class CustomPropertySelector : IPropertySelector
12     {
13         
14         public bool InjectProperty(PropertyInfo propertyInfo, object instance)
15         {
16             //判断哪里属性需要属性注入
17             return propertyInfo.CustomAttributes.Any(c => c.AttributeType == typeof(CustomSelectAttribute));
18         }
19     }
20 }

3、修改Headphone

 1 using Business.FrameWork.AutofacExt;
 2 using Business.IServices;
 3 
 4 namespace Business.Services
 5 {
 6     public class Headphone : IHeadphone
 7     {
 8         [CustomSelectAttribute]
 9         public IMicrophone microphone { get; set; }
10 
11         public IPower power1 { get; set; }
12         
13         public Headphone(IPower power)
14         {
15             Console.WriteLine($"{this.GetType().Name}被构造...");
16         }
17     }
18 }

 

4、修改Program.cs

1  //指定属性才注入
2     ContainerBuilder containerBuilder = new ContainerBuilder();
3     containerBuilder.RegisterType<Microphone>().As<IMicrophone>();
4     containerBuilder.RegisterType<Power>().As<IPower>();
5     containerBuilder.RegisterType<Headphone>().As<IHeadphone>();
6     containerBuilder.RegisterType<Headphone>().As<IHeadphone>().PropertiesAutowired(new CustomPropertySelector()); //支持属性注入，指定选择器
7     IContainer container = containerBuilder.Build();
8     IHeadphone headphone = container.Resolve<IHeadphone>();

 

5、设置断点，运行程序

可以发现

[CustomSelectAttribute]
public IMicrophone microphone { get; set; }

指定了[CustomSelectAttribute]才被创建实例，

public IPower power1 { get; set; }没有被创建。

 

三、方法注入

1、headphone类添加方法Init

 1 using Business.FrameWork.AutofacExt;
 2 using Business.IServices;
 3 
 4 namespace Business.Services
 5 {
 6     public class Headphone : IHeadphone
 7     {
 8         //[CustomSelectAttribute]
 9         //public IMicrophone microphone { get; set; }
10 
11         //public IPower power1 { get; set; }
12         
13         public Headphone(IPower power)
14         {
15             Console.WriteLine($"{this.GetType().Name}被构造...");
16         }
17 
18         public void Init(IPower power2)
19         {
20             Console.WriteLine("方法注入");
21         }
22     }
23 }
View Code

2、修改Program.cs

 1 {
 2     //方法注入
 3     ContainerBuilder containerBuilder = new ContainerBuilder();
 4     containerBuilder.RegisterType<Microphone>().As<IMicrophone>();
 5     containerBuilder.RegisterType<Power>().As<IPower>();
 6     containerBuilder.RegisterType<Headphone>().As<IHeadphone>();
 7     containerBuilder.RegisterType<Headphone>().As<IHeadphone>().OnActivated(   
 8         activate =>
 9         {
10             IPower power = activate.Context.Resolve<IPower>();
11             activate.Instance.Init(power);  //方法注入
12         });
13     IContainer container = containerBuilder.Build();
14     IHeadphone headphone = container.Resolve<IHeadphone>();
15 }

 

posted @ 2022-05-22 16:44  ziff123  阅读(965)  评论(0)  编辑  收藏  举报