DPC：Creating a DataBound List of Radio Buttons--预览页面source code[等级：中]

页面

<% @Import Namespace="System.Data" %> 
<% @Import Namespace="System.Data.SqlClient" %> 
<script language="vb" runat="server"> 
 Sub Page_Load(sender as Object, e as EventArgs) 
 If Not Page.IsPostBack then 
 BindData() 
 End If 
 End Sub 
 
 
 Sub BindData() 
 '1. Create a connection 
 Dim myConnection as New SqlConnection(ConfigurationSettings.AppSettings("connectionString")) 
 
 '2. Create the command object, passing in the SQL string 
 Const strSQL as String = "SELECT PublisherID, Name FROM tblPublishers ORDER BY Name" 
 Dim myCommand as New SqlCommand(strSQL, myConnection) 
 
 myConnection.Open() 
 
 radlstPubs.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection) 
 radlstPubs.DataBind() 
 
 End Sub 
 
 
 
 Sub btnViewBooks_Click(sender as Object, e as EventArgs) 
 'If the user has not selected an item from the radiobuttonlist, 
 'do nothing 
 If radlstPubs.SelectedItem Is Nothing then Exit Sub 
 
 '1. Create a connection 
 Dim myConnection as New SqlConnection(ConfigurationSettings.AppSettings("connectionString")) 
 
 '2. Create the command object, passing in the SQL string 
 Dim strSQL as String = "SELECT Title, Description FROM tblBooks " & _ 
 " WHERE PublisherID = " & radlstPubs.SelectedItem.Value & _ 
 " ORDER BY Title" 
 Dim myCommand as New SqlCommand(strSQL, myConnection) 
 
 myConnection.Open() 
 
 dgBooks.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection) 
 dgBooks.DataBind() 
 
 lblTitle.Text = "Books Published by " & radlstPubs.SelectedItem.Text 
 End Sub 
</script> 
 
<html> 
<body> 
 
 <h1>Radio Button List Demo</h1> 
 This demo illustrates how to use data-binding to dynamically 
 create a radio button list based on database information. 
 The data below is from the 
 <a href="http://www.4guysfromrolla.com/webtech/chapters/">Sample Chapters Database</a>. 
 First, the radio button list is bound to the <code>tblPublishers</code> table. Then, 
 when you select a publisher, a DataGrid Web control is populated with 
 the books provided by the selected publisher. (Adding paging to the DataGrid would be 
 a snap. Just read: <a href="http://www.4guysfromrolla.com/webtech/072101-1.shtml">Paing 
 Database Results in ASP.NET</a>!) 
 <hr> 
 
 <form runat="server"> 
 
 Choose a Publisher's Books to View 
 <asp:radiobuttonlist id="radlstPubs" runat="server" Font-Name="Verdana" 
 DataValueField="PublisherID" DataTextField="Name" /> 
 
 <asp:button id="btnViewBooks" runat="server" Font-Name="Verdana" 
 Text="View Published Books" OnClick="btnViewBooks_Click" /> 
 
 
 <asp:label id="lblTitle" runat="server" Font-Name="Verdana" 
 Font-Size="Large" Font-Bold="True" /> 
 <asp:datagrid id="dgBooks" runat="server" 
 Font-Name="Verdana" Font-Size="Smaller" 
 HeaderStyle-BackColor="Purple" HeaderStyle-ForeColor="White" 
 HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="True" 
 AutoGenerateColumns="False"> 
 
 <Columns> 
 
 <asp:BoundColumn HeaderText="Book Title" HeaderStyle-HorizontalAlign="Center" 
 DataField="Title" /> 
 <asp:BoundColumn HeaderText="Synopsis" HeaderStyle-HorizontalAlign="Center" 
 DataField="Description" /> 
 </Columns> 
 </asp:datagrid> 
 
 </form>

时间： 2024-12-31 19:42:26

DPC：Creating a DataBound List of Radio Buttons--预览页面source code[等级：中]

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