AutoRegistDependency 1.0.12

AutoRegistDependency

介绍

AutoFac二次封装,实现根据特性自动注入功能

使用说明

nuget 搜索 AutoRegistDependency 进行安装

1. 注册服务 program.cs文件中 (.net6以上)

builder.Host.ConfigureContainer<ContainerBuilder>((hostBuilderContext, containerBuilder) =>
{
	new Register(hostBuilderContext).RegisterType(containerBuilder);
});
builder.Host.UseServiceProviderFactory(new AutofacServiceProviderFactory());
 **如果控制器需要使用autofac原生属性注入,需要使autofac接管controller,需添加以下代码** 
builder.Services.AddControllers().AddControllersAsServices();//控制器生成作为服务
builder.Services.Replace(ServiceDescriptor.Transient<IControllerActivator, ServiceBasedControllerActivator>());

.net core 3.x program.cs文件中

public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                   .ConfigureContainer<ContainerBuilder>((hostBuilderContext, containerBuilder)=>
                {
                    new Register(hostBuilderContext).RegisterType(containerBuilder);
                })
                  .UseServiceProviderFactory(new AutofacServiceProviderFactory());

.net core 2.x (暂时先请用1.0.9之前的版本 ) startup文件中，改写ConfigureServices方法

 public IServiceProvider ConfigureServices(IServiceCollection services)

 {
            
    var builder = new ContainerBuilder();//实例化 AutoFac  容器
    builder.Populate(services);//管道寄居
    new Register()
        //.SetDefaultLifeTime() //设置所有实例的默认生命周期,默认scope
    .RegisterType(builder);
    ApplicationContainer = builder.Build();
    return new AutofacServiceProvider(ApplicationContainer);//将autofac反馈到管道中

 }

2. 特性说明 ComponentAttribute 只能标记在类上,代表此类型需要被自动注入

/// constructor
/// </summary>
/// <param name="lifetime">生命周期</param>
/// <param name="autoActivate">是否自动激活实例</param>
/// <param name="interceptorType">拦截器代理类型</param>
/// <param name="name">服务名(默认类名简称)</param>
/// <param name="key">服务key</param>
/// <param name="registType">注册类型(注册自己本身还是作为接口实现类)</param>
/// <param name="propertyInjectType">autofac属性注入方式,是否通过特性标记需要注入的属性</param>
public ComponentAttribute(LifeTimeType lifetime = LifeTimeType.Default, bool autoActivate = false,
string name = "",object key=null,RegistType registType= RegistType.Default,
PropertyInjectType propertyInjectType = PropertyInjectType.Default)
{
    Lifetime = lifetime;
    AutoActivate = autoActivate;
    Name = name;
    PropertyInjectType = propertyInjectType;
    Key = key;
    RegistType= registType;
}

ConfigurationPropertiesAttribute 只能标记在类上，代表此类型是通过配置文件读取并进行实例绑定

/// <summary>
/// constructor
/// </summary>
public ConfigurationPropertiesAttribute(string path)
{
    Path = path;//path为使用IConfiguration读取数据的key,和.net core原生读取规则一致
}

ConfigurationAttribute 只能标记在类上,代表此类被容器单例管理,通常配合bean使用

注意 以上三种特性在同一个类中只能拥有一个，也就是说一个类只能作为一种服务类型注册到容器中！

BeanAttribute 只能标记在方法上，代表此方法返回的实例需要被管理 （此方法的类上未标记ConfigurationAttribute无效！！）

/// <summary>
/// constructor
/// </summary>
public BeanAttribute(string name = "",object key=null,LifeTimeType lifeTimeType = LifeTimeType.Default)
{
    Name = name;
    Key= key;
    LifeTimeType = lifeTimeType;
}

AutowiredAttribute 可以标记在属性、字段上以及方法上 代表此属性（字段）将注入到实例中

/// <summary>
/// constructor
/// </summary>
/// <param name="name">需要获取的服务名(根据参数的类型和name去取)</param>
public AutowiredAttribute(string name = "")
{
   Name = name;
}

ConfigurationPropertiesAttribute 仅能标记在类上,代表自动从IConfiguration读取配置文件数据

//path为读取配置文件的字符串,和使用IConfiguration原生读取规则相同。
public ConfigurationPropertiesAttribute(string path)
{
   Path = path;
}

ValueAttribute 可标记在属性,字段和参数上。代表被标记的对象需要从配置文件中自动读取数据

//path为读取配置文件的字符串,和使用IConfiguration原生读取规则相同。
public ValueAttribute(string path)
{
   Path = path;
}

OrderAttribute 标记在类上，代表服务注册的顺序 越小越先注册

/// <summary>
/// constructor
/// </summary>
public OrderAttribute(int order)
{
   this.Order = order;
}

RegistAsAttribute 标记在类上，代表此服务以何种类型注册(如果不是注册类型的父类或者注册类型所实现的接口,在注册初始化时将会报错)

/// <summary>
/// constructor
/// </summary>
public RegistAsAttribute(params Type[] types)
{
    Types = types;
}

ConditionalAttribute 标记在类上或者方法上,代表注册此服务是有条件的,conditionTypes为实现接口ICondition的实现类。如果hostBuilderContext为空的话，不会执行conditional特性所指定的类

public ConditionalAttribute(params Type[] conditionTypes)
{
    ConditionTypes = conditionTypes;
}

public interface ICondition
{
    bool Matches(HostBuilderContext hostBuilderContext, IComponentRegistryBuilder componentRegistry, object attributeMeta);
    参数说明：
    hostBuilderContext:包含程序整体的上下文信息，包括IHostEnvironment，IConfiguration等。
    componentRegistry：注册上下文
    attributeMeta：标记特性的原数据，Component为Type，Bean为MethodInfo
}

3. 动态代理注册方法 继承抽象类 AbstractInterceptor 实现抽象类的抽象方法(非泛型类的代理方法一定要是virtual,泛型类无法代理,只能代理泛型接口)

public abstract class AbstractInterceptor : IInterceptor, IAsyncInterceptor
{
  protected readonly IEnumerable<Assembly> dlls;//为实例化Register时所扫描的程序集
  public AbstractInterceptor(IEnumerable<Assembly> dlls)
  {
     this.dlls = dlls;
  }
  public abstract IEnumerable<Type> GetInterceptorTypes();//此方法返回需要被代理的所有类型
  public abstract void Intercept(IInvocation invocation);//固定写法 this.ToInterceptor().Intercept(invocation);
  public abstract void InterceptAsynchronous(IInvocation invocation);//Task返回类型的拦截方法
  public abstract void InterceptAsynchronous<TResult>(IInvocation invocation);//Task<TResult>返回类型的拦截方法
  public abstract void InterceptSynchronous(IInvocation invocation);//同步方法的拦截
}

4.简单代码示例 新建web项目 新建接口和实现

public interface ITest
{
   string Say();
}
 **[Component(name:"Test")]** 
public class Test : ITest
{
   public Test() { }
   public string Say()
   {
    return nameof(Test);
   }
}

 **[Component(key: "Test1")]** 
public class Test1 : ITest
{
  public virtual string Say()
  {
    return nameof(Test1);
  }
}
//新建配置文件自动绑定实体
[ConfigurationPropertiesAttribute(path: "Logging:LogLevel")]
public class LogModel
{
   public string Default { get; set; }
}

bean类型注册
 **[Configuration]** 
public class ConfigurationTest
{
		 **[Bean]** 
    public LogModel GetBeanObject([ComponentFilter(name: "Test")] ITest test)
    {
	test.Say();
	return new LogModel()
	{
		Default = "12345"
	};
    }
}

//拦截器
 **[Component]** 
public class TestInterceptor : AbstractInterceptor
{
   public TestInterceptor(IEnumerable<Assembly> dlls) : base(dlls)
   {
   }

   public override IEnumerable<Type> GetInterceptorTypes()
   {
       //从基类继承的dll变量是扫描到的所有程序集,可以通过程序集获取对应的被代理类型 这里只是个示例
       return new Type[] { typeof(Test),typeof(Test1) };
   }

    public override void Intercept(IInvocation invocation)
    {
	this.ToInterceptor().Intercept(invocation);
    }

    public override void InterceptAsynchronous(IInvocation invocation)
    {
	Console.WriteLine($"before:{nameof(InterceptAsynchronous)}");
	invocation.Proceed();//执行被拦截的返回值为Task的方法
	Console.WriteLine($"after:{nameof(InterceptAsynchronous)}");
    }

    public override void InterceptAsynchronous<TResult>(IInvocation invocation)
    {
	Console.WriteLine($"before:{nameof(InterceptAsynchronous)}");
	invocation.Proceed();
	Console.WriteLine($"after:{nameof(InterceptAsynchronous)}");
    }

    public override void InterceptSynchronous(IInvocation invocation)
    {
	Console.WriteLine($"before:{nameof(InterceptSynchronous)}");
	invocation.Proceed();
	Console.WriteLine($"after:{nameof(InterceptSynchronous)}");
     }
}


//注入调用
[ApiController]
 **[Component]** 
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
    private readonly LogModel logModel;
    private static readonly string[] Summaries = new[]
    {
	"Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };

    private readonly ILogger<WeatherForecastController> _logger;
    [Autowired(key: "Test1")]
    private Test1 test1;//属性注入，指定服务key名
    private ITest test;
    [Value("Logging:LogLevel")]
    private LogModel testValue;//配置文件注入
    [Autowired]
    private IGenercTest<LogModel> genercTest;
    [Autowired]
    private void GetTest([ComponentFilter(name: "Test")] ITest test)//方法注入，支持参数特性筛选指定服务
    {
	this.test = test;
    }

    public WeatherForecastController(LogModel logModel,ILogger<WeatherForecastController> logger)
    {
	_logger = logger;
	//this.test= test;
	this.logModel = logModel;
	//this.genercTest = genercTest;
    }

    [HttpGet(Name = "GetWeatherForecast")]
    public IEnumerable<WeatherForecast> Get()
    {
	Console.WriteLine($"test:{test1.Say()}");
	Console.WriteLine($"genercTest:{genercTest.Say()}");
	return Enumerable.Range(1, 5).Select(index => new WeatherForecast
	{
		Date = DateTime.Now.AddDays(index),
		TemperatureC = Random.Shared.Next(-20, 55),
		Summary = Summaries[Random.Shared.Next(Summaries.Length)]
	})
	.ToArray();
}

所有服务注册时必须加入响应的特性,否则无法注入成功(包括控制器)