按钮Click事件触发DropDownList_SelectedIndexChanged事件，但我不想要它。 [英] Button Click event fires DropDownList_SelectedIndexChanged event but I don't want it.

问题描述

嗨




我有两个下拉列表 - ddl1和ddl2以及一个按钮。

我选择一个值来自ddl1，它触发ddl1_selectedIndexChanged事件。

出现上述事件时，ddl1选择的值将转到WHERE子句中的SELECT语句中的数据库，以获取所需数据的一些行。

这个新数据表现在填充ddl2。

现在我从ddl2中选择一个值。

我按下按钮。

现在我想用button_click事件中的ddl2_selected值。

当我按下按钮时，ddl1_selectedIndexChanged事件意外触发并再次绑定ddl2，因此我松开了ddl2_selectedValue。



我的页面中没有使用AJAX或更新面板。

ASP.NET 4.0。

ddl1 - EnableViewState True，PostBack = True

ddl2 - EnableViewState True，PostBack = False



请帮帮我。

提前致谢。

Hi

I have two drop down lists - ddl1 and ddl2 and a button.
I select a value from ddl1 which fires ddl1_selectedIndexChanged event.
On occurance of abovesaid event, ddl1 selected value goes to database in a SELECT statement in WHERE Clause to fetch some rows of required data.
This new data table now populates ddl2.
Now I select a value from ddl2.
I press the button.
Now I want to use the ddl2_selected value in button_click event.
What happens is when I press the button, ddl1_selectedIndexChanged event fires unexpectedly and binds the ddl2 once again and hence I loose the ddl2_selectedValue.

I have not used AJAX or Update Panel in my page.
ASP.NET 4.0.
ddl1 - EnableViewState True, PostBack = True
ddl2 - EnableViewState True, PostBack = False

Please help me out.
Thanks in advance.

推荐答案

大家好，



我通过网上的几个博客解决了这个问题。

我在做什么是在asp面板中编写了这整套控件。

此面板的viewState属性设置为False。

尽快我将其更改为true，不需要的selectedindexchanged事件被抑制。



这让我了解了。 :)



但是，这是一种预感。

我还没知道为什么会发生这种情况？



非常欢迎解释。



@Anil：感谢关注。

Hi Everyone,

I resolved the issue by going through a couple of more blogs over net.
What I was doing was I wrote these entire set of controls in asp Panel.
The viewState property of this panel was set to False.
As soon as I changed it to true, the unwanted selectedindexchanged event got suppressed.

This got me through. :)

But, it was a hunch.
I did not yet got the reason why this happened ?

Explanations are most welcome.

@Anil: Thanks fot the concern.

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