C#事件管理器如何清空所有监听详解
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2022-04-29 14:33:10
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...
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。
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