unity3DAction和Func的运用

Action与Func是.NEt中的内置委托类型，可以直接用来定义委托而无需先声明，非常的方便

Action的简单运用

1.  
   //使用Action，Func等.Net自带的内置委托Action和Func
2.  
   //须引用名称为System的命名空间
3.  
   using System;
4.  
   using System.Collections;
5.  
   using System.Collections.Generic;
6.  
   using UnityEngine;
7.  
    
8.  
   /*//无参
9.  
   public delegate void Action();
10.  
    //1个参数
11.  
    public delegate void Action<in T>(T obj);
12.  
    //2个参数
13.  
    public delegate void Action<in T1, in T2>(T1 Obj1, T2 obj2);*/
14.  
     
15.  
     
16.  
    public class ActionTest : MonoBehaviour
17.  
    {
18.  
    //无参
19.  
    Action SayGoodBayAction;
20.  
    //一个参数
21.  
    Action<string> SayHelloAction;
22.  
    //两个参数
23.  
    Action<string, string> strTestAction;
24.  
    // Start is called before the first frame update
25.  
    void Start()
26.  
    {
27.  
    SayHelloClass mySayHello = new SayHelloClass();
28.  
    mySayHello.OnHello("Tom1");
29.  
     
30.  
    SayHelloAction = myTest;
31.  
    SayHelloAction = myTest;
32.  
    SayHelloAction = mySayHello.OnHello;
33.  
     
34.  
     
35.  
    SayGoodBayAction = myTest2;
36.  
     
37.  
    strTestAction = myTest3;
38.  
     
39.  
    SayHelloAction.Invoke("Tom");
40.  
    SayGoodBayAction.Invoke();
41.  
     
42.  
    strTestAction.Invoke("汤姆" , "杰瑞");
43.  
     
44.  
    }
45.  
     
46.  
    // Update is called once per frame
47.  
    void Update()
48.  
    {
49.  
     
50.  
    }
51.  
     
52.  
    private static void myTest( string name)
53.  
    {
54.  
    Debug.Log($"This is a Test,{name}");
55.  
    }
56.  
     
57.  
    private static void myTest2()
58.  
    {
59.  
    Debug.Log("This is myTest2");
60.  
    }
61.  
     
62.  
    private static void myTest3(string str1, string str2)
63.  
    {
64.  
    Debug.Log($"{str1} {str2}");
65.  
    }
66.  
    }
67.  
     
68.  
     
69.  
    public class SayHelloClass : ISayHello
70.  
    {
71.  
    public void OnHello(string message)
72.  
    {
73.  
    Debug.Log($"Hello,my name is {message}");
74.  
    }
75.  
    }
76.  
     
77.  
    public interface ISayHello
78.  
    {
79.  
    void OnHello(string message);
80.  
    }

Func的简单运用

1.  
   using System;
2.  
   using System.Collections;
3.  
   using System.Collections.Generic;
4.  
   using UnityEngine;
5.  
    
6.  
   public class Func : MonoBehaviour
7.  
   {
8.  
   Func<int,int,int> myFunc = null;
9.  
   // Start is called before the first frame update
10.  
    void Start()
11.  
    {
12.  
     
13.  
    myFunc = Add;
14.  
     
15.  
    if(myFunc != null)
16.  
    {
17.  
    int result = myFunc.Invoke(2, 3);
18.  
    Debug.Log(result);
19.  
    }
20.  
     
21.  
    myFunc -= Add;
22.  
     
23.  
    //检查是否有误
24.  
    try
25.  
    {
26.  
    myFunc.Invoke(5, 2);
27.  
    }
28.  
    catch
29.  
    {
30.  
    Debug.Log("委托可能为空");
31.  
    }
32.  
    finally
33.  
    {
34.  
    //重新指向Add函数
35.  
    myFunc = Add;
36.  
    Debug.Log($"result = {myFunc.Invoke(10,8)}");
37.  
     
38.  
    //移出Add
39.  
    myFunc -= Add;
40.  
     
41.  
    //Lambda表达式
42.  
    //指向匿名函数
43.  
    myFunc = (x, y) =>
44.  
    {
45.  
    return x y;
46.  
    };
47.  
    Debug.Log($"result = {myFunc.Invoke(9, 6)}");
48.  
    }
49.  
     
50.  
    }
51.  
     
52.  
    // Update is called once per frame
53.  
    void Update()
54.  
    {
55.  
     
56.  
    }
57.  
     
58.  
    //加法
59.  
    int Add(int x, int y)
60.  
    {
61.  
    int z = x y;
62.  
    return z;
63.  
    }
64.  
    //减法
65.  
    int Mul(int x, int y)
66.  
    {
67.  
    int z = x - y;
68.  
    return z;
69.  
    }
70.  
     
71.  
    }

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