摘要 class 事件 c#

Question

我试图在我的摘要 class 和派生的 class 中引发事件，并让它们出现在 main 中的同一个事件中。这可能吗？使用下面的代码，我在两个 raise 事件中设置了一个断点，并且我看到了 bar raise 但从未看到 foo 并且由于 OnDataReceived 为 null 而从未调用 main 中的实际事件。我究竟做错了什么？如果我尝试在 bar 中使 bar 事件抽象和 Raise Function virtual 并在我的派生 classes 中重写这两者，那么我会得到一个错误，因为 bar 中的 OnDataReceived 不是 += 或 -= 的左侧。

这里基本上是我所拥有的：

public abstract class bar
{
    public event DataReceivedHandler OnDataReceived;

    protected void RaiseDataReceivedEvent(EventArgs e)
    {
        if (OnDataReceived != null)
            OnDataReceived(this, e);
    }

    /// <summary>
    /// A global event that will happen for all "bar" derived classes
    /// </summary>
    private void globalEvent()
    {
        //Raise this event for the derived class here.
        RaiseDataReceivedEvent(new EventArgs());
    }
}

public class foo : bar
{
    public foo()
    {

    }

    /// <summary>
    /// A specific event that will happen only for this derived class
    /// </summary>
    private void fooSpecificEvent()
    {
        //Raise this event for the derived class here
        RaiseDataReceivedEvent(new EventArgs());
    }
}

public class Main
{
    bar specificProduct = new foo();

    public Main()
    {
        specificProduct.OnDataReceived += specificProduct_OnDataReceived;
    }

    void specificProduct_OnDataReceived(object sender, IttsDataReceivedEventArgs e)
    {
        //Here I want to process events from both fooSpecificEvent and globalEvent calls to RaiseDataReceivedEvent
    }
}

Answer 1

您可以将方法 GlobalEvent() 更改为 protected 并简单地从 foo 特定事件中调用它。类似的东西：

    private void fooSpecificEvent()
{
    //Raise this event for the derived class here
    RaiseDataReceivedEvent(new EventArgs());
    base.globalEvent();
}

Answer 2

所以，是的...上面的代码有效。只需确保调用的 foo 对象与连接到事件的 foo 对象相同。愚蠢的错误。

我有 foo_1.OnDataReceived 有线，但 foo_2 是事件调用。

摘要 class 事件 c#

abstract class event c#

c#

abstract-class

derived-class