【语法糖】Delegate?.Invoke();

Delegate?.Invoke(); 格式检测委托是否为空，DoAction1与DoAction2等价，但是语法更简单。

using System;

public class Test: MonoBehaviour
{
    public Action act;

    void Start()
    {
        //DoAction0(); // NullReferenceException: Object reference not set to an instance of an object
        DoAction1();
        
        act = MyAction;
        DoAction1();
        DoAction2();
    }

    void DoAction0()
    {
        act();
    }

    void DoAction1()
    {
        if (act != null)
            act();
    }

    void DoAction2()
    {
        act?.Invoke();
    }

    void MyAction()
    {
        Debug.Log("Action");
    }
}

来源：CSDN

作者：setsuodu

链接：https://blog.csdn.net/mseol/article/details/104578829