为什么我的DropDownList的SelectedItem每次仅显示列表中的第一项？ [英] Why is my DropDownList's SelectedItem only showing the first item in the list each time?

问题描述

我在使用XML文件填充的ASP.NET DropDownList 时遇到问题：

I am having a problem with an ASP.NET DropDownList which is populated by an XML file:

rblState.DataSource = dsState;
rblState.DataValueField = "abbreviation";
rblState.DataTextField = "name";
rblState.DataBind();

这可以正常工作并显示所有正确的数据，但是，当我尝试检索选定的数据时会出现问题单击按钮后，列表中的值：

This works fine and displays all the right data however, the problem occurs when I try and retrieve the selected value from the list after a button has been clicked:

string state = rblState.SelectedItem.Text;
Console.WriteLine(state);

这总是只输出列表中的第一个值。

This always outputs only the first value within the list.

有人知道解决方案吗？

推荐答案

您可能正在重新绑定 DataBack 。而是这样做：

You are probably re-binding the DataSource on PostBack. Instead, do this:

//only bind on the first request
if (!Page.IsPostBack)
{
    rblState.DataSource = dsState;
    rblState.DataValueField = "abbreviation";
    rblState.DataTextField = "name";
    rblState.DataBind();

}

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