C#中接口的显式实现与隐式实现及其相关应用案例详解

 public interface ICanSingSong
 {
     void SingJayChow();
     void SingOther();
 }

 public class InterfaceDesignExample : MonoBehaviour,ICanSingSong
 {
     void Start()
     {
         //接口的隐式实现 可以直接调用
         SingJayChow();
         //显示调用则需要 准换成接口 调用
         //this.SingOther();   
         (this as ICanSingSong).SingOther();
     }
     /// <summary>
     /// 接口的隐式实现
     /// </summary>
     public void SingJayChow()
     {
         Debug.Log("你说家是唯一的城堡，随着稻香一路奔跑~");
     }
     /// <summary>
     /// 接口的显式实现
     /// </summary>
     void ICanSingSong.SingOther()
     { 
         Debug.Log("lalalalalalallalaal!");
     }
 }

//接口 Application
public interface IApplication
{
    void Start();
    void Update();
    void Destroy();
    void Test();
}

//抽象类
public abstract class Application : IApplication
{
    //不希望子类去访问实现接口的方法
    //使用显式调用
    void IApplication.Start()
    {
    	OnStart();
    }
    void IApplication.Update()
    {
    	OnUpdate();
    }
    void IApplication.Destroy()
    {
    	OnDestroy();
    }
    public void Test()
    {
    Debug.Log("我是测试方法，隐式实现接口的方法，子类可以轻松访问我");
    }
    //希望子类的实现的方法
    public abstract void OnStart();
    public abstract void OnUpdate();
    public abstract void OnDestroy();
}

 //子类
public class SubApplication : Application
{
    public override void OnStart()
    {
        Test();
        //Start(); 情况会发生递归调用 造成堆栈溢出 而此方法使用现实实现 所以在子类中无法访问 避免情况发生
        Debug.Log("OnStart");
    }
    public override void OnUpdate()
    {
        Debug.Log("OnUpdate");
    }
    public override void OnDestroy()
    {
        Debug.Log("OnDestroy");
    }
}

//测试调用
//通过接口调用 显示实现的方法
IApplication application = new SubApplication();
application.Start();
application.Update();
application.Destroy();
//通过类 无法调用显示实现的方法 只能访问使用OnXXXX方法
Application application2 = new SubApplication();
application2.OnStart();
application2.OnUpdate();
application2.OnDestroy();

 //曲库
 public class SongLibrary
 {
     public void SingSunny()
     {
    	 Debug.Log("晴天：刮风这天，我试着握你的手~");
     }
 		//彩虹
     public void SingRainbow()
     {
     	Debug.Log("彩虹：你要离开，我知道很简单~");
     }
    public void SingNoCry()
    {
    	Debug.Log("说好不哭：说好不哭让我走~");
    }
}

public interface ISingAllSong
{
	SongLibrary songLibrary { get; }
}

public interface ISingSunny : ISingAllSong
{
}
//静态类拓展
public static class SingSunnyExtensions
{
    public static void SingSunny(this ISingSunny self)
    {
       self.songLibrary.SingSunny();
    }
}

//彩虹
    public interface ISingRainbow : ISingAllSong
    {
    }
    //静态类拓展
    public static class SingRainbowExtensions
    {
        public static void SingRainbow(this ISingRainbow self)
        {
            self.songLibrary.SingRainbow();
        }
    }
    //说好不哭
    public interface ISingNoCry : ISingAllSong
    {
    }
    //静态类拓展
    public static class SingNoCryExtensions
    {
        public static void SingNoCry(this ISingNoCry self)
        {
            self.songLibrary.SingNoCry();
        }
    }

public class InterfaceRuleExample : MonoBehaviour
{
    public class OnlySingSunny : ISingSunny
    {
    	SongLibrary ISingAllSong.songLibrary { get; } = new SongLibrary();
    }
    public class OnlySingRainbowNoCry : ISingRainbow,ISingNoCry
    {
    	SongLibrary ISingAllSong.songLibrary { get; } = new SongLibrary();
    }
    void Start()
    {
        var onlySingSunny = new OnlySingSunny();
        onlySingSunny.SingSunny();
        //不能访问
        //onlySingSunny.SingRainbow()
        //onlySingSunny.SingNoCry();
        var SingRainbowNoCry = new OnlySingRainbowNoCry();
        SingRainbowNoCry.SingRainbow();
        SingRainbowNoCry.SingNoCry();
        //无法访问
        //SingRainbowNoCry.SingSUnny();
    }
}