设置单选按钮列表从codebehind选择 [英] Set Radiobuttonlist Selected from Codebehind

问题描述

嘿，我有一个单选按钮列表，并试图设置单选按钮中的一个选择的基于会话变量，但证明是不可能的。

Hey I have a radiobuttonlist and trying to set one of the radiobuttons to selected based on a session variable but proving impossible.

<asp:radiobuttonlist id="radio1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged">
   <asp:listitem id="option1" runat="server" value="All"/>
   <asp:listitem id="option2" runat="server" value="1" />
   <asp:listitem id="option3" runat="server" value="2" />
</asp:radiobuttonlist> 

即如何设置选项2在code选择背后？

I.e How can I set option2 to selected in code behind ?

推荐答案

您可以这样做：

radio1.SelectedIndex = 1;

但是，这是最简单的形式和您的UI增长将最有可能成为问题。说，举例来说，如果一个团队成员的插入的在项目单选按钮列表上方选项2 但是不知道我们使用的幻数的在code-后面选择 - 现在的应用程序选择了错误的指数

But this is the most simple form and would most likely become problematic as your UI grows. Say, for instance, if a team member inserts an item in the RadioButtonList above option2 but doesn't know we use magic numbers in code-behind to select - now the app selects the wrong index!

也许你想看看使用<一个href=\"http://msdn.microsoft.com/en-us/library/system.web.ui.control.findcontrol.aspx\">FindControl为了确定列表项实际需要，通过名称，以及适当地选择。例如：

Maybe you want to look into using FindControl in order to determine the ListItem actually required, by name, and selecting appropriately. For instance:

//omitting possible null reference checks...
var wantedOption = radio1.FindControl("option2").Selected = true;

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