ASP .NET - XML Files

We can bind an XML file to a list control.

Examples

1.Example 1 - XML RadiobuttonList

<%@ 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>

Output Result:

 

If  you click one of the radios ,it will shows :(for example: you have clicked the radio Norway)

Your favorite country is: Norway

 

An XML File

Here is an XML file named "countries.xml":

<?xml version="1.0" encoding="ISO-8859-1"?>
<countries>
<country>
            <text>Norway</text>
            <value>N</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>

 

Bind a DataSet to a List Control

First, import the "System.Data" namespace. We need this namespace to work with DataSet objects. Include the following directive at the top of an .aspx page:

<%@ Import Namespace="System.Data" %>

Next, create a DataSet for the XML file and load the XML file into the DataSet when the page is first loaded:

<script runat="server">
            sub Page_Load
            if Not Page.IsPostBack then
            dim mycountries=New DataSet
            mycountries.ReadXml(MapPath("countries.xml"))
            end if
            end sub

To bind the DataSet to a RadioButtonList control, first create a RadioButtonList control (without any asp:ListItem elements) in an .aspx page:

<html>
            <body>
<form runat="server">
            <asp:RadioButtonList id="rb" runat="server"
            AutoPostBack="True" />
</form>
</body>
            </html>

Then add the script that builds the XML DataSet:

<%@ 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>

Then we add a sub routine to be executed when the user clicks on an item in the RadioButtonList control. When a radio button is clicked, a text will appear in a label:

<%@ 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>

posted on 2007-03-06 15:39  改变热爱  阅读(191)  评论(0)    收藏  举报

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