C#事件管理器如何清空所有監聽詳解
阿新 • • 發佈:2020-07-17
C#事件使用+= -=使用起來是很方便的,但是卻不能整體清空所有事件。比如一個常見的操作,開啟介面註冊監聽事件,關閉介面需要把所有的事件清空了,這要在寫一堆-=操作,如果漏清空的話肯定會造成隱患,如果在lua裡這個很容易,但是C#卻不行。所以我想了個辦法,對Action和Func進行一次包裝,就可以解決這個問題了。
這裡我只封裝了兩個引數,大家可以繼續拓展新的引數,我在專案裡一共拓展了5個引數,完全夠用了。
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,T2> b) { a.func -= b; a.func += b; return a; } public static NewFunc<T1,T2> operator -(NewFunc<T1,T2> b) { a.func -= b; return a; } }
使用方法如下,注意我們自己封裝的事件必須要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>註冊事件</size>")) { m_ActionManager.RegAction(MyAction,MyFunction); m_ActionManager.RegAction(MyFunc,MyFunction1); } if (GUILayout.Button("<size=50>發事件</size>")) { MyAction.Invoke("引數1"); MyFunc.Invoke("引數2"); } if (GUILayout.Button("<size=50>清空</size>")) { m_ActionManager.Clear(); } } }
事件管理器可以放在UI或者模組的基類中,這樣子類在寫的時候可以直接this.RegAction註冊事件,關閉介面或者解除安裝模組的時候由父類呼叫Clear方法,這樣業務邏輯就不需要在寫-=這樣的程式碼了。
總結
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