这里有一个名为 "countries.xml" 的 XML 文件:
Code
<?xml version="1.0" encoding="ISO-8859-1"?>
<countries>
<country>
<text>China</text>
<value>C</value>
</country>
<country>
<text>Sweden</text>
<value>S</value>
</country>
<country>
<text>France</text>
<value>F</value>
</country>
<country>
<text>Italy</text>
<value>I</value>
</country>
</countries>
请查看该文件:countries.xml
把 DataSet 绑定到 List 控件
首先,导入 "System.Data" 命名空间。我们需要该命名空间与 DataSet 对象一起工作。把下面这条指令包含在 .aspx 页面的顶部:
<%@ Import Namespace="System.Data" %>
接下来,为这个 XML 文件创建一个 DataSet,并在页面首先加载时把这个 XML 文件载入该 DataSet:
Code
<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New DataSet
mycountries.ReadXml(MapPath("countries.xml"))
end if
end sub
如需把该 DataSet 绑定到 RadioButtonList 控件,首先请在 .aspx 页面中创建一个 RadioButtonList 控件(没有任何 asp:ListItem 元素):
Code
<html>
<body>
<form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" />
</form>
</body>
</html>
然后添加构建这个 XML DataSet 的脚本:
Code
<%@ Import Namespace="System.Data" %>
<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New DataSet
mycountries.ReadXml(MapPath("countries.xml"))
rb.DataSource=mycountries
rb.DataValueField="value"
rb.DataTextField="text"
rb.DataBind()
end if
end sub
</script>
<html>
<body>
<form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" onSelectedIndexChanged="displayMessage" />
</form>
</body>
</html>
然后,我们添加一个子例程,该子例程会在用户点击 RadioButtonList 控件中的项目时执行。当用户点击某个单选按钮时,label 中会出现一条文本:
Code
<%@ Import Namespace="System.Data" %>
<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New DataSet
mycountries.ReadXml(MapPath("countries.xml"))
rb.DataSource=mycountries
rb.DataValueField="value"
rb.DataTextField="text"
rb.DataBind()
end if
end sub
sub displayMessage(s as Object,e As EventArgs)
lbl1.text="Your favorite country is: " & rb.SelectedItem.Text
end sub
</script>
<html>
<body>
<form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" onSelectedIndexChanged="displayMessage" />
<p><asp:label id="lbl1" runat="server" /></p>
</form>
</body>
</html>