C#委托

using UnityEngine;
using UnityEngine.Events;

public class random : MonoBehaviour
{

//声明带参委托
public UnityAction<string> aaa;
//声明带参带返回值委托
public System.Func<int, int, int> bbb;

public void Attack(string bossname)
{
    print("打击怪兽:" + bossname);
}

public int addfunc(int a, int b)
{
    return a + b;
}
public int addfunc2(int a, int b)
{
    return a + b;
}

// Start is called before the first frame update
void Start()
{
    aaa=Attack;
    aaa("怪兽");
    bbb = addfunc;
    int c= bbb(1, 2);
    print(c); //3
    bbb += addfunc2;
    c = bbb(3, 4);
    print(c); //7

    //C#的委托
    System.Action ac = () =>
    {
        print("C#无参无返回值委托");
    };
    System.Action<int, float> ac2 = (a, b) => {
        print("C#有参无返回值委托");
    };
    System.Func<int> fun1 = () => {
        print("C#无参带返回值委托");
        return 1;
    };
    //多个参数,最后一个是返回值
    System.Func<int, int, int> fun2 = (a,b) => {
        return a+b;
    };

    //调用
    ac();
    ac2(1, 2);
    print("fun:" + fun1());
    print("fun:" + fun2(3,5));



    //Unity自带委托
    //无参无返回值的委托
    UnityAction uac = () =>
    {
        print("Unity无参委托");
    };
    //无返回值带参数的委托
    UnityAction<string,int> uac2 = (s,a) =>
    {
        print(s+","+a.ToString());
    };

    uac();
    uac2("haha",2);

    //总结:如果需要返回值的委托,就用C#的带返回值的委托
    
    //?.就是有内容就执行,没有就不执行
    bbb?.Invoke(1,1);
    print("bbb里没放容器");
    print("------------------");
    bbb = addfunc;
    int c= bbb(1, 2);
    print("bbb里有容器:" + c);


}

}