DropDownList当value相同时，获取值会失败

xxdddail · 发表于 2014-12-18 09:27:02

DropDownList在数据绑定时，如果有value相同的项，在选择后，会得不到SelectedValue，此时的SelectedIndex是-1。
界面代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="1.aspx.cs" Inherits="TEST._1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<f

ageManager runat="server" ID="

ageManager1"></f

ageManager>
<f:Button runat="server" ID="btnTest" Text="测试"></f:Button>
<f

ropDownList runat="server" ID="DropDownList_Test"></f

ropDownList>
      </div>
</form>
</body>
</html>

后台代码：
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using FineUI;

namespace TEST
{
public partial class _1 : System.Web.UI.Page
{
      protected void Page_Load(object sender, EventArgs e)
      {
         if (!IsPostBack)
         {
            DropDownList_Test.DataSource = GenerateData();
            DropDownList_Test.DataTextField = "TEXT";
            DropDownList_Test.DataValueField = "VALUE";
            DropDownList_Test.DataBind();
         }
      }

      private DataTable GenerateData()
      {
         DataTable dt = new DataTable();
         dt.Columns.Add("VALUE");
         dt.Columns.Add("TEXT");

         dt.Rows.Add(new String[] { "1", "ALL" });
         dt.Rows.Add(new String[] { "1", "OTHER" });

         return dt;
      }

      protected void btnTest_Click(object sender, EventArgs e)
      {
         Alert.Show("TEXT:"+DropDownList_Test.SelectedText+"\n"
                     +"VALUE"+DropDownList_Test.SelectedValue+"\n"
                     + "INDEX:" + DropDownList_Test.SelectedIndex);
      }
}
}

zy32002 · 发表于 2014-12-18 10:47:51

DropDownList是不能设置相同的value

xxdddail · 发表于 2014-12-18 11:23:54

zy32002 发表于 2014-12-18 10:47
DropDownList是不能设置相同的value

原则上是这样的，但不该是空

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DropDownList当value相同时，获取值会失败

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