C#事件管理器如何清空所有监听详解

c#事件使用+= -=使用起来是很方便的，但是却不能整体清空所有事件。比如一个常见的操作，打开界面注册监听事件，关闭界面需要把所有的事件清空了，这要在写一堆-=操作，如果漏清空的话肯定会造成隐患，如果在lua里这个很容易，但是c#却不行。所以我想了个办法，对action和func进行一次包装，就可以解决这个问题了。

这里我只封装了两个参数，大家可以继续拓展新的参数，我在项目里一共拓展了5个参数，完全够用了。

using system;
using system.collections.generic;
 
public class actionmanager
{
  dictionary<object, object> m_actions = new dictionary<object, object>();
 
  public newaction regaction(newaction newaction , action action)
  {
    newaction += action;
    m_actions[newaction] = action;
    return newaction;
  }
  public newaction<t1> regaction<t1>(newaction<t1> newaction, action<t1> action)
  {
    newaction += action;
    m_actions[newaction] = action;
    return newaction;
  }
  public newfunc<t1> regaction<t1>(newfunc<t1> newaction, func<t1> action)
  {
    newaction += action;
    m_actions[newaction] = action;
    return newaction;
  }
  public newfunc<t1,t2> regaction<t1, t2>(newfunc<t1, t2> newaction, func<t1, t2> action)
  {
    newaction += action;
    m_actions[newaction] = action;
    return newaction;
  }
 
  public void clear()
  {
    foreach (var act in m_actions)
    {
      ((iaction)act.key).dispose(act.value);
    }
  }
}
 
public interface iaction
{
  void dispose(object obj);
}
public class newaction : iaction
{
  action action;
  public void dispose(object obj)
  {
    if(obj is action act)
      action -= act;
  }
  public void invoke()
  {
    action?.invoke();
  }
  public static newaction operator +(newaction a, action b)
  {
    a.action -= b;
    a.action += b;
    return a;
  }
  public static newaction operator -(newaction a, action b)
  {
    a.action -= b;
    return a;
  }
}
public class newaction<t1> : iaction
{
  action<t1> action;
  public void dispose(object obj)
  {
    if (obj is action<t1> act)
      action -= act;
  }
  public void invoke(t1 t1)
  {
    action?.invoke(t1);
  }
  public static newaction<t1> operator +(newaction<t1> a, action<t1> b)
  {
    a.action -= b;
    a.action += b;
    return a;
  }
  public static newaction<t1> operator -(newaction<t1> a, action<t1> b)
  {
    a.action -= b;
    return a;
  }
}
public class newfunc<t1> : iaction
{
  func<t1> func;
  public void dispose(object obj)
  {
    if (obj is func<t1> act)
      func -= act;
  }
  public t1 invoke()
  {
    return func != null ? func.invoke() : default(t1);
  }
  public static newfunc<t1> operator +(newfunc<t1> a, func<t1> b)
  {
    a.func -= b;
    a.func += b;
    return a;
  }
  public static newfunc<t1> operator -(newfunc<t1> a, func<t1> b)
  {
    a.func -= b;
    return a;
  }
}
public class newfunc<t1, t2> : iaction
{
  func<t1, t2> func;
  public void dispose(object obj)
  {
    if (obj is func<t1, t2> act)
      func -= act;
  }
  public t2 invoke(t1 t1)
  {
    return func != null ? func.invoke(t1) : default(t2);
  }
  public static newfunc<t1, t2> operator +(newfunc<t1, t2> a, func<t1, t2> b)
  {
    a.func -= b;
    a.func += b;
    return a;
  }
  public static newfunc<t1, t2> operator -(newfunc<t1, t2> a, func<t1, t2> b)
  {
    a.func -= b;
    return a;
  }
}

使用方法如下，注意我们自己封装的事件必须要new。

using unityengine;
 
public class main : monobehaviour
{
  newaction<string> myaction = new newaction<string>();//事件需要new
  newfunc<string,int> myfunc = new newfunc<string,int>();//事件需要new
 
 
  actionmanager m_actionmanager = new actionmanager();
 
  public void myfunction(string str)
  {
    debug.log(" myfunction " + str);
  }
  public int myfunction1(string str)
  {
    debug.log(" myfunction1 " + str);
    return 1;
  }
 
  private void ongui()
  {
    if (guilayout.button("<size=50>注册事件</size>"))
    {
      m_actionmanager.regaction(myaction, myfunction);
      m_actionmanager.regaction(myfunc, myfunction1);
    }
 
    if (guilayout.button("<size=50>发事件</size>"))
    {
      myaction.invoke("参数1");
      myfunc.invoke("参数2");
    }
    if (guilayout.button("<size=50>清空</size>"))
    {
      m_actionmanager.clear();
    }
  }
}

事件管理器可以放在ui或者模块的基类中，这样子类在写的时候可以直接this.regaction注册事件，关闭界面或者卸载模块的时候由父类调用clear方法，这样业务逻辑就不需要在写-=这样的代码了。

总结

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