事件类型不能是Action＆lt;＆gt ;?

Question

这是有效的

public event Func<int,int> createEvents;

但为什么不呢？

public event Action<int> createEvents;

Answer 1

public event Action<int> CreateEvents;

完全有效。也许您的事件处理方法与Action<T>代理不匹配。

也许你有这样的事情：

    public event Action<int> CreateEvents;
    public event Func<int, int> CreateEvents2;

    public int OnCreateEvents2(int value)
    {
        Func<int, int> handler = CreateEvents2;
        if (handler != null) return handler(value);

        return 0;
    }

    public void OnCreateEvents(int value)
    {
        Action<int> handler = CreateEvents;
        if (handler != null) handler(value);
    }