如何使事件在该用户和有它在主窗体Handeled？ [英] How do I make an Event in the Usercontrol and Have it Handeled in the Main Form?

问题描述

我有一个自定义用户控件，我想要做一些比较简单的。

I have a custom usercontrol and I want to do something relatively simple.

当过数字最多在用户控件的值发生变化了，有主要形式更新一个展示窗口。

When ever a numeric up down in that usercontrol's value changes, have the main form update a display window.

这是不是一个问题，如果NUD是不是在一个用户控件，但我似乎无法弄清楚如何有由MainForm中处理该事件，而不是用户控件。

This is not a problem if the NUD was not in a usercontrol but I can't seem to figure out how to have the event handled by the mainform and not the usercontrol.

推荐答案

您需要创建当从用户控件中触发一个事件所引发的用户控件的事件处理程序。这将允许你去泡事件了链，使您可以处理从表单中的事件。

You need to create an event handler for the user control that is raised when an event from within the user control is fired. This will allow you to bubble the event up the chain so you can handle the event from the form.

用户控制：

public event EventHandler ButtonClick;

protected void Button1_Click(object sender, EventArgs e)
{
    //bubble the event up to the parent
    if (this.ButtonClick!= null)
        this.ButtonClick(this, e);               
}

形式：

UserControl1.OnButtonClick += new EventHandler(UserControl_ButtonClick);

protected void UserControl_ButtonClick(object sender, EventArgs e)
{
    //handle the event 
}

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