This tutorial shows you how to display data that resides in an XML file, in a GridView and DataList. VB version.
This tutorial shows how XML pages can be used to store data, and how you can use ASP.NET to display that data on your web page.
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First, look at the XML file. You'll notice it's structure is hierarchical:
<?xml version="1.0" standalone="yes"?>
<videos>
<video vidID="000000001"
title="The Breakfast Club"
price="9.95">
<comments>
<userComment rating="4"
comment="Interesting watch, with laugh out loud moments." />
<userComment rating="3"
comment="Not bad." />
</comments>
</video>
<video vidID="000000002"
title="The Goonies"
price="9.95">
<comments>
<userComment rating="5"
comment="My kids loved it." />
<userComment rating="2"
comment="Childish. Inconceivable." />
</comments>
</video>
<video vidID="000000003"
title="The Lawnmower Man"
price="10.95" >
<comments>
<userComment rating="4"
comment="An interesting movie." />
</comments>
</video>
<video vidID="000000004"
title="War of the Worlds"
price="16.95" >
<comments>
<userComment rating="4"
comment="Excellent!" />
</comments>
</video>
<video vidID="000000005"
title="Titanic"
price="1.95" >
</video>
</videos> |
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To display the data, we use a GridView control and XmlDataSource.
In this example, there is also a DataList which displays data nested in the XML file.
<form id="form1" runat="server">
<div>
<asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="~/App_Data/Videos.xml">
</asp:XmlDataSource>
</div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="XmlDataSource1" CellPadding="4" ForeColor="#333333" GridLines="None" DataKeyNames="vidID" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
<Columns>
<asp:CommandField ShowSelectButton="True" />
<asp:BoundField DataField="vidID" HeaderText="ID" SortExpression="vidID" />
<asp:BoundField DataField="title" HeaderText="Title" SortExpression="title" >
<ItemStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="price" HeaderText="Price" SortExpression="price" />
</Columns>
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<RowStyle BackColor="#EFF3FB" />
<EditRowStyle BackColor="#2461BF" />
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<AlternatingRowStyle BackColor="White" />
</asp:GridView>
<asp:DataList ID="DataList1" runat="server" DataSourceID="XmlDataSource2" Visible="False">
<ItemTemplate>
User Rating:
<asp:Label ID="ratingLabel" runat="server" Text='<%# Eval("rating") %>'></asp:Label><br />
Comment:
<asp:Label ID="commentLabel" runat="server" Text='<%# Eval("comment") %>'></asp:Label><br />
<br />
</ItemTemplate>
<SeparatorTemplate>
<hr />
</SeparatorTemplate>
</asp:DataList><br />
<asp:XmlDataSource ID="XmlDataSource2" runat="server" DataFile="~/App_Data/Videos.xml"
XPath="/videos/video/comments/userComment "></asp:XmlDataSource>
<br />
</form> |
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The following code makes sure the DataList displays the nested elements in the XML file, which are not shown in the GridView, when the user selects one of the entries in the GridView. This dynamically changes the Xpath when the user selects a new item from the GridView.
Protected Sub GridView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
Dim vidID As String = CType(GridView1.DataKeys(GridView1.SelectedIndex).Value, String)
XmlDataSource2.XPath = String.Format("/videos/video[@vidID='{0}']/comments/userComment", vidID)
DataList1.Visible = True
End Sub |
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