C#事件，如何引发它们? [英] C# events, how to raise them?

问题描述

我正在尝试使用C#学习引发和处理事件.

I'm trying to learn raising and handling events in C#.

这是我的简单示例:

///////////////  creating a new BALL object ///    
ballClass ball = new ballClass();

void button1_Click(object sender, EventArgs e)
{
    // this should make the BALL object raise an event
    ball.onHit();
    label1.Text = "EVENT SEND";
}

// when event is fired, label text should change
void BallInPlayEvent(object sender, EventArgs e)
{
    label2.Text = "EVENT FOUND!";
}

和球类:

class ballClass
{
    public event EventHandler BallInPlay;

    public void onHit()
    {
        this.BallInPlay ///// ??? how should i raise this event?
    }
}

在电话中，我真的听不懂，我该如何发起活动?有什么想法吗?...:)

In the call I can't really understand, how do I raise the event? Any ideas?... :)

谢谢！

推荐答案

public void onHit()
{
   if(BallInPlay != null)
     BallInPlay(this, new EventArgs());
}

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