在用户控制中解释自定义事件的代码 [英] Explain code for custom event in user control

问题描述

有人给了我这个代码非常好。但我真的很想了解它内部发生了什么。有人可以解释吗代码的每个部分的含义是什么？该代码位于面板内有两个标签的自定义控件中。

另外我看到一些使用add / remove语法的自定义控件事件，这是什么？这里有什么区别？

  public partial class UserControl1：UserControl 
 {
 public UserControl1（）
 {
 InitializeComponent（）; 
} 
 
 public event EventHandler MyCustomClickEvent; 
 
 protected virtual void OnMyCustomClickEvent（EventArgs e）
 {
 //这里，你使用this，所以这是你自己的控件。你也可以
 //自定义EventArgs来传递你想要的东西。 
 
 if（MyCustomClickEvent！= null）
 MyCustomClickEvent（this，e）; 
} 
 
 private void label1_Click（object sender，EventArgs e）
 {
 OnMyCustomClickEvent（EventArgs.Empty）; 
} 
} 
  

解决方案

我的意见如下。另外，对于更详细的活动，我博客这个概念一会儿回到了整个过程的更多细节。

  public partial class UserControl1：UserControl 
 {
 //这是用户控件的标准构造函数
 public UserControl1（）
 {
 InitializeComponent（）; 
} 
 
 //这定义了一个名为MyCustomClickEvent的事件，它是一个通用的
 //事件处理程序。 （EventHander是一个委托定义，定义了事件将共享哪些信息的契约
 //在这种情况下，EventArgs对象的单个参数
 // 
 public event EventHandler MyCustomClickEvent; 
 
 
 //此方法用于提升事件，当事件应该被引发时，
 //此方法将检查是否有任何订阅者，如果有，
 //它引发事件
 protected virtual void OnMyCustomClickEvent（EventArgs e）
 {
 //这里，你使用this，所以这是你自己的控件
 
如果（MyCustomClickEvent！= null）
 MyCustomClickEvent（this，e）; 
} 
 
 private void label1_Click（object sender，EventArgs e）
 {
 OnMyCustomClickEvent（EventArgs.Empty）; 
} 
} 
  

Someone gave me this code that works great. But I would really like to understand what is happening inside it. Could somebody explain please? What is the meaning of each part of the code? The code is inside a custom control which has two labels inside a panel.

Also I've seen some custom control events that use add/remove syntax, what is that for? What is the difference with what is happening here?

public partial class UserControl1 : UserControl
{
    public UserControl1()
    {
        InitializeComponent();
    }

    public event EventHandler MyCustomClickEvent;

    protected virtual void OnMyCustomClickEvent(EventArgs e)
    {
        // Here, you use the "this" so it's your own control. You can also
        // customize the EventArgs to pass something you'd like.

        if (MyCustomClickEvent != null)
            MyCustomClickEvent(this, e);
    }

    private void label1_Click(object sender, EventArgs e)
    {
        OnMyCustomClickEvent(EventArgs.Empty);
    }
}

解决方案

See my comments below. Also for a more detailed event I blogged on this concept a while back where I go into more detail on the entire process.

public partial class UserControl1 : UserControl
{
    //This is the standard constructor of a user control
    public UserControl1()
    {
        InitializeComponent();
    }

    //This defines an event called "MyCustomClickEvent", which is a generic
    //event handler.  (EventHander is a delegate definition that defines the contract
    //of what information will be shared by the event.  In this case a single parameter
    //of an EventArgs object.
    public event EventHandler MyCustomClickEvent;


    //This method is used to raise the event, when the event should be raised, 
    //this method will check to see if there are any subscribers, if there are, 
    //it raises the event
    protected virtual void OnMyCustomClickEvent(EventArgs e)
    {
        // Here, you use the "this" so it's your own control. You can also
        // customize the EventArgs to pass something you'd like.

        if (MyCustomClickEvent != null)
            MyCustomClickEvent(this, e);
    }

    private void label1_Click(object sender, EventArgs e)
    {
        OnMyCustomClickEvent(EventArgs.Empty);
    }
}

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