在线问答5

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Unity——VContainer的依赖注入

作者：在线问答5 | 2024-08-05 18:35:21

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vcontainer

一、IOC控制反转和DI依赖倒置

1、IOC框架核心原理是依赖倒置原则

C#设计模式的六大原则

使用这种思想方式，可以让我们无需关心对象的生成方式，只需要告诉容器我需要的对象即可，而告诉容器我需要对象的方式就叫做DI（依赖注入）。

今天主要想研究一下DI（依赖注入），这里我选了VContainer

地址:https://github.com/hadashiA/VContainer

文档地址:https://vcontainer.hadashikick.jp/

二、VContainer介绍

由于我们使用的是Unity，而主要的Mono不支持构造函数。所以我们这里选择注入方式主要是特性注入和方法注入

三、VContainer案例

（1）简单方法注入：

1、注册类型


public class GameLifetimeScope : LifetimeScope
{
    protected override void Configure(IContainerBuilder builder)
    {
        builder.RegisterEntryPoint<ActorPresenter>();
    }
}

2、方法注入

这里实现接口 IStartable和ITickable。它是不依赖于Mono的接口，因此性能上更好，另一方面，IStartable与Mono的Start，ITickable与Mono的Update都是相同的。


public class ActorPresenter : IStartable,ITickable
{
    public void Start()
    {
        Debug.Log("Start ActorPresenter");
    }
 
    public void Tick()
    {
        Debug.Log("Update ActorPresenter");
    }
}

（2）基础MVC功能：

Model层


public class UIModel
{
    public void Hello() 
    {
        Debug.Log("Hello World");
    }
}

View层


public class UIView : MonoBehaviour
{
    public Button button;
}

Control层


public class UIControl : IStartable
{
    readonly UIModel _model;
    readonly UIView _view;
 
    public UIControl(UIModel model)
    {
        this._model = model;
    }
 
    public UIControl(UIModel model, UIView view)
    {
        this._model = model;
        this._view = view;
    }
 
    public void Start()
    {
        _view.button.onClick.AddListener(() => _model.Hello());
    }
}

通过这样做，我们成功地分离了领域控制/控制流/显示组件

在VContainter中，记得注册


public class GameLifetimeScope : LifetimeScope
{
    public UIView helloScreen;
    protected override void Configure(IContainerBuilder builder)
    {
        builder.RegisterEntryPoint<UIControl>();
        builder.Register<UIModel>(Lifetime.Singleton);
        builder.RegisterComponent(helloScreen);
    }
}

（3）构造注入

构造函数里，只需要写一个需要依赖注入的函数，成员变量里就可以随时获得对象。如下例子ClassB构造函数的参数是ClassA，我们的classA变量就可以随时使用


class ClassB : IStartable,ITickable
{
    readonly ClassA a;
    public ClassB(ClassA a)
    {
        Debug.Log("ClassA构造函数注入");
        this.a = a;
    }
 
    public void Start()
    {
        a.Start();
    }
 
    public void Tick()
    {
        a.Update();
    }
}


class ClassA
{
    public ClassA()
    {
        Debug.Log("ClassA构造");
    }
 
    public void Start()
    {
        Debug.Log("Start");
    }
    public void Update() 
    {
        Debug.Log("Update");
    }
}


public class GameLifetimeScope : LifetimeScope
{
    //public UIView helloScreen;
 
    protected override void Configure(IContainerBuilder builder)
    {
 
        builder.RegisterEntryPoint<ClassB>();
        builder.Register<ClassA>(Lifetime.Singleton);
    }
}

（4）方法注入（其他的和上边一样）


class ClassB : IStartable,ITickable
{
    private ClassA a;
 
    [Inject]
    public void GetClassA(ClassA a) 
    {
        Debug.Log("方法注入");
        this.a = a;
    }
 
    public void Start()
    {
        a.Start();
    }
 
    public void Tick()
    {
        a.Update();
    }
}

（5）字段/属性注入


class ClassB : IStartable,ITickable
{
    [Inject]
    private ClassA a;
 
    public void Start()
    {
        a.Start();
    }
 
    public void Tick()
    {
        a.Update();
    }
}

3、注册接口


public class GameLifetimeScople : LifetimeScope
{
    protected override void Configure(IContainerBuilder builder)
    {
        //接口
        builder.Register<ILogger, Logger>(Lifetime.Singleton);
        builder.RegisterEntryPoint<LoggerEntryPoint>();
    }
}


interface ILogger
{
    void Log(string message);
}
 
public class Logger : ILogger
{
    public void Log(string message)
    {
        Debug.Log(message);
    }
}
public class LoggerEntryPoint : IStartable
{
    [Inject] private ILogger logger;
    public void Start()
    {
        logger.Log("哈哈哈");
    }
}

4、注册工厂


public class GameLifetimeScople : LifetimeScope
{
    protected override void Configure(IContainerBuilder builder)
    {
        //工厂
        builder.RegisterEntryPoint<LoggerEntryPoint>();
        builder.RegisterFactory<ILogger>(() => new Logger());
    }
}


public class Logger : ILogger
{
    public void Log(string message)
    {
        Debug.Log(message);
    }
}
public class LoggerEntryPoint : IStartable
{
    private ILogger logger;
    [Inject]
    public LoggerEntryPoint(Func<ILogger> loggerFactory)
    {
        logger = loggerFactory.Invoke();
    }
    public void Start()
    {
        logger.Log("哈哈哈");
    }
}

带参


public class GameLifetimeScople : LifetimeScope
{
    protected override void Configure(IContainerBuilder builder)
    {
        //工厂
        builder.RegisterEntryPoint<LoggerEntryPoint>();
        builder.RegisterFactory<string, ILogger>((value) => new Logger(value));
    }
}


using VContainer.Unity;
using VContainer;
using UnityEngine;
using System;
public interface ILogger
{
    void Log(string message);
}
 
public class Logger : ILogger
{
    public Logger(string value)
    {
        Debug.Log($"实例化:{value}");
    }
    public void Log(string message)
    {
        Debug.Log(message);
    }
}
public class LoggerEntryPoint : IStartable
{
    [Inject]
    public LoggerEntryPoint(Func<string, ILogger> loggerFactory)
    {
        loggerFactory.Invoke("第一个对象").Log("哈哈哈");
        loggerFactory.Invoke("第二个对象").Log("啦啦啦");
    }
 
    public void Start()
    {
        
    }
}

4、RegisterInstance


    protected override void Configure(IContainerBuilder builder)
    {
        builder.RegisterEntryPoint<LoggerEntryPoint>();
        var logger = new Logger();
        builder.RegisterInstance(logger);
 
    }


public interface ILogger
{
    void Log(string message);
}
 
public class Logger : ILogger
{
    public void Log(string message)
    {
        Debug.Log(message);
    }
}
public class LoggerEntryPoint : IStartable
{
    public LoggerEntryPoint(Logger logger)
    {
        logger.Log("哈哈哈");        
    }
 
    public void Start()
    {
        
    }
}

5、RegisterComponent


    private TestMonoBehaviour testMonoBehaviour;
 
    protected override void Configure(IContainerBuilder builder)
    {
        testMonoBehaviour = GetComponent<TestMonoBehaviour>();
        builder.RegisterEntryPoint<LoggerEntryPoint>();
        builder.RegisterComponent(testMonoBehaviour);
    }


public class LoggerEntryPoint : IStartable
{
    public LoggerEntryPoint(TestMonoBehaviour testMonoBehaviour)
    {
        testMonoBehaviour.Log("11111111");        
    }
 
    public void Start()
    {
        
    }
}

6、不依赖EntryPoint


   builder.Register<Logger>(Lifetime.Singleton);
        builder.RegisterBuildCallback(objectResolver =>
        {
            objectResolver.Resolve<Logger>();
        });


public class Logger
{
    public Logger()
    {
        Debug.Log("hahhah");
    }
}

如果经常这样使用，可以拓展


public static class ObjectResolverExtensions
{
    public static RegistrationBuilder RegisterPlainEntryPoint<T>(this IContainerBuilder builder, Lifetime lifetime = Lifetime.Singleton)
    {
        builder.RegisterBuildCallback(objectResolver => objectResolver.Resolve<T>());
        return builder.Register<T>(lifetime);
    }
}

 builder.RegisterPlainEntryPoint<Logger>();


public class Logger
{
    public Logger()
    {
        Debug.Log("啦啦啦");
    }
}

如果有此扩展方法，则可以使用一行调用与以前相同的 Register 和 RegisterBuildCallback。builder.RegisterPlainEntryPoint<EntryPointSample>();

7、处理EntryPoint的异常情况


    builder.RegisterEntryPointExceptionHandler(e =>
    {
        Debug.LogException(e);
    });

生命周期：

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