dropdownlist选择索引已更改不文件 [英] dropdownlist selected index changed does not file

问题描述

我有一个下拉列表

 <   asp ：DropDownList     runat   =  server    ID   =  DDLState    CssClass   =  txtp  
   
                   onselectedindexchanged   =  DDLState_SelectedIndexChanged    
   
                   AutoPostBack   =  True     AppendDataBoundItems   = < span class =code-keyword> True  
   
            < span class =code-attribute>    >  
 
 <   asp：ListItem  > 选择州<   / asp：ListItem  >  
 
 <   / asp：DropDownList  >  

我在页面加载时填写它。

我还有一个按钮

 <   asp：按钮    runat   =  server    ID   =  btnsubmit   文字  = 提交    
   
                   BackColor   =  Silver      onclick   =  btnsubmit_Click      /  >  

 受保护  void  btnsubmit_Click（  object  sender，EventArgs e）
 {
 DDLState.SelectedIndex =  2 ; 
} 

DDLState_SelectedIndexChanged不会激活。

解决方案

< blockquote class =FQ>

Quote：

你确定吗？

是的， Harshil_Raval 是正确的。



参考 - ListControl.SelectedIndexChanged事件 [ ^ ]。

引用：

当列表控件中的选择在发布到服务器的帖子之间发生变化时，会引发SelectedIndexChanged事件。

I have a dropdownlist

<asp:DropDownList runat="server" ID="DDLState" CssClass="txtp"

        onselectedindexchanged="DDLState_SelectedIndexChanged" 

        AutoPostBack="True" AppendDataBoundItems="True"

       >
      
        <asp:ListItem>Select State</asp:ListItem>
      
    </asp:DropDownList>

I am filling it on pageload.
I have a button also

<asp:Button runat="server" ID="btnsubmit" Text="Submit" 

        BackColor="Silver"  onclick="btnsubmit_Click"  />

protected void btnsubmit_Click(object sender, EventArgs e)
        {
 DDLState.SelectedIndex=2;
}

DDLState_SelectedIndexChangeddoes not fire.

解决方案

Quote:

Are you sure?

Yes, Harshil_Raval is correct.

Refer- ListControl.SelectedIndexChanged Event[^].

Quote:

The SelectedIndexChanged event is raised when the selection from the list control changes between posts to the server.

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