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不会针对在运行时创建的下拉列表触发选定的索引更改事件

[英]doesn't fire selected index changed event for a drop down list created on run time

原文 2011-03-16 07:45:29 2 2 c#/ .net/ asp.net/ events

Q: 问：

I have the following case : 我有以下情况：

a button , when clicking on this button , create a drop down list on run time ,and make an event(selected index changed ) for the drop down list.. 一个按钮，单击此按钮时，将在运行时创建一个下拉列表，并为该下拉列表创建一个事件（选择索引已更改）。

but what happen is half the previous scenario , i mean creating the drop down list on run time but it doesn't enter the(selected index changed).. 但是发生的事情是前一种情况的一半，我的意思是在运行时创建一个下拉列表，但没有输入（所选索引已更改）。

i don't know what is the problem? 我不知道是什么问题？

2 个解决方案

Not sure what the exact scenario is, but every time you postback, you'll have to create the drop down list and register to the event. 不确定确切的情况是什么，但是每次回发时，都必须创建下拉列表并注册该事件。 Couldn't you hide/show and populate the dropdown box on click of the button? 单击按钮后是否可以隐藏/显示并填充下拉框？ Have a look at the link for a similar issue. 查看类似问题的链接。

http://www.dreamincode.net/forums/topic/165499-access-selectedindex-of-dropdownlist-created-at-runtime/ http://www.dreamincode.net/forums/topic/165499-access-selectedindex-of-dropdownlist-created-at-runtime/

Haven't tried this myself, but this link might help you, if you must add the control dynamically http://shawpnendu.blogspot.com/2010/04/runtime-add-dynamic-dropdownlist-and.html 自己还没有尝试过，但是如果必须动态添加控件，则此链接可能会对您有所帮助http://shawpnendu.blogspot.com/2010/04/runtime-add-dynamic-dropdownlist-and.html

did you set ddl.AutoPostBack = true; 您是否设置了ddl.AutoPostBack = true; when adding control runtime? 添加控件运行时时？