如何编写OnSelectedIndexChanged事件

本文介绍了如何编写OnSelectedIndexChanged事件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

大家好，

我很困惑，如何写一个下拉列表的OnSelectedIndexChanged事件。

Hi guys,

I'm very confused, how to write OnSelectedIndexChanged Event of a dropdownlist.

SCENARIO:

---------------------------------------------------------------------------
|Repeater 1                                                                |
---------------------------------------------------------------------------
| ------------------------------------------------------------------------ |
| |Repeater 2                                                             ||
| |-----------------------------------------------------------------------||
| |-----------------------------------------------------------------------||
| |WEB USER CONTROL WITH: DROPDOWNLIST N A TEXTBOX  - [1]                 ||
| |-----------------------------------------------------------------------||
| |WEB USER CONTROL WITH: DROPDOWNLIST N A TEXTBOX  - [2]                 ||
| |-----------------------------------------------------------------------||
| |WEB USER CONTROL WITH: DROPDOWNLIST N A TEXTBOX  - [3]                 ||
| |-----------------------------------------------------------------------||
| -------------------------------------------------------------------------|
----------------------------------------------------------------------------

我已经填充了d下拉列表，它位于WebUserControl中，

但是，现在问题是，

如何编写OnSelectedIndexChanged事件。

所以，如果我在d下拉列表中选择任何值，它的文本也应该出现在那个WebUserControl的文本框中。

Plzzzz的家伙帮帮我。

谢谢

I have populated d dropdownlist which is in d WebUserControl,
but, now the problem is,
How to write its "OnSelectedIndexChanged" event.
So that, If i select any value in d dropdownlist, its text should also appear in
the textbox of that WebUserControl.

Plzzzz guys help me.

thanks

推荐答案

public event Action<string>OnSelectedIndexChangedDropDownListEvent;

此事件可以由使用您的Web用户控件的页面订阅。

在Web用户中你在写OnSelectedIndexChanged的方法中控制：

This event can be subscribed to by the pages that uses your web user control.
in the web user control in the method for the OnSelectedIndexChanged you write:

if (OnSelectedIndexChangedDropDownListEvent!=null)
    OnSelectedIndexChangedDropDownListEvent(dropdownListNameHere.SelectedValue);

所以内部事件是通过OnSelectedIndexChangedDropDownListEvent发布到外部世界。

So the inner event is posted to the outside world via the OnSelectedIndexChangedDropDownListEvent.

protected void rptrSection1_Bound(object sender, RepeaterItemEventArgs e)
{
var ctl = e.Item.FindControl("ddlS1") as SDropDownList;
ctl.SelectedIndexChanged += new EventHandler(ddlS1_SelectedIndexChanged);
}

[code]....

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onSelectedIndexChanged