Note: This property is new in the .NET Framework version 2.0.
Gets or sets a value that indicates whether list items are cleared before data binding.
Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)
Visual Basic (Declaration)
<ThemeableAttribute(False)> _
Public Overridable Property AppendDataBoundItems As Boolean
Dim instance As ListControl
Dim value As Boolean
value = instance.AppendDataBoundItems
instance.AppendDataBoundItems = value
[ThemeableAttribute(false)]
public virtual bool AppendDataBoundItems { get; set; }
[ThemeableAttribute(false)]
public:
virtual property bool AppendDataBoundItems {
bool get ();
void set (bool value);
}
/** @property */
public boolean get_AppendDataBoundItems ()
/** @property */
public void set_AppendDataBoundItems (boolean value)
public function get AppendDataBoundItems () : boolean
public function set AppendDataBoundItems (value : boolean)
Property Value
true if list items are not cleared before data binding; otherwise, false, if the items collection is cleared before data binding is performed. The default is false.
The AppendDataBoundItems property allows you to add items to the ListControl object before data binding occurs. After data binding, the items collection contains both the items from the data source and the previously added items.
The value of this property is stored in view state.
This property cannot be set by themes or style sheet themes. For more information, see ThemeableAttribute and ASP.NET Themes and Skins Overview.
The following code example demonstrates how to include both data-bound items and items that are not data-bound in a ListBox control. In the Load event for the Page, one item is added to the Items collection and the AppendDataBoundItems property is set to true. Then, the ListBox control is bound to a DataTable control. The resulting ListBox control contains both the data-bound items and the item that was added individually.
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<html>
<script language="VB" runat="server">
Function CreateDataSource() As ICollection
Dim dt As New DataTable()
Dim dr As DataRow
dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
dt.Columns.Add(New DataColumn("DateTimeValue", GetType(DateTime)))
dt.Columns.Add(New DataColumn("BoolValue", GetType(Boolean)))
dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
Dim i As Integer
For i = 0 To 8
dr = dt.NewRow()
dr(0) = i
dr(1) = "Item " + i.ToString()
dr(2) = DateTime.Now
If (i Mod 2) <> 0 Then
dr(3) = True
Else
dr(3) = False
End If
dr(4) = 1.23 *(i + 1)
dt.Rows.Add(dr)
Next i
Dim dv As New DataView(dt)
Return dv
End Function
Sub Page_Load(sender As Object, e As EventArgs)
If Not IsPostBack Then
RadioButtonList1.Items.Add("Non-databound item.")
RadioButtonList1.AppendDataBoundItems = True
RadioButtonList1.DataSource = CreateDataSource()
RadioButtonList1.DataTextField = "StringValue"
RadioButtonList1.DataValueField = "CurrencyValue"
RadioButtonList1.DataBind()
End If
End Sub
Sub Index_Changed(sender As Object, e As EventArgs)
Label1.Text = "You selected " & RadioButtonList1.SelectedItem.Text & _
" with a value of : " & RadioButtonList1.SelectedItem.Value & "."
End Sub
</script>
<body>
<form id="Form1" runat=server>
<asp:RadioButtonList id="RadioButtonList1"
OnSelectedIndexChanged="Index_Changed"
AutoPostBack="true"
runat="server"/>
<br>
<asp:Label id="Label1" runat="server"/>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<html>
<script language="C#" runat="server">
ICollection CreateDataSource() {
DataTable dt = new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
dt.Columns.Add(new DataColumn("DateTimeValue", typeof(DateTime)));
dt.Columns.Add(new DataColumn("BoolValue", typeof(bool)));
dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));
for (int i = 0; i < 9; i++) {
dr = dt.NewRow();
dr[0] = i;
dr[1] = "Item " + i.ToString();
dr[2] = DateTime.Now;
dr[3] = (i % 2 != 0) ? true : false;
dr[4] = 1.23 * (i+1);
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
return dv;
}
void Page_Load(Object sender, EventArgs e) {
if (!IsPostBack) {
RadioButtonList1.Items.Add("Non-databound item.");
RadioButtonList1.AppendDataBoundItems = true;
RadioButtonList1.DataSource = CreateDataSource();
RadioButtonList1.DataTextField="StringValue";
RadioButtonList1.DataValueField="CurrencyValue";
RadioButtonList1.DataBind();
}
}
void Index_Changed(Object sender, EventArgs e) {
Label1.Text = "You selected " + RadioButtonList1.SelectedItem.Text +
" with a value of $" + RadioButtonList1.SelectedItem.Value +
".";
}
</script>
<body>
<form id="Form1" runat=server>
<asp:RadioButtonList id="RadioButtonList1"
OnSelectedIndexChanged="Index_Changed"
AutoPostBack="true"
runat="server"/>
<br>
<asp:Label id="Label1" runat="server"/>
</form>
</body>
</html>
<%@ Page Language="JScript" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<html>
<script language="JSCRIPT" runat="server">
function CreateDataSource() : ICollection{
var dt : DataTable = new DataTable()
var dr : DataRow
dt.Columns.Add(new DataColumn("IntegerValue", System.Int32))
dt.Columns.Add(new DataColumn("StringValue", System.String))
dt.Columns.Add(new DataColumn("DateTimeValue", System.DateTime))
dt.Columns.Add(new DataColumn("BoolValue", System.Boolean))
dt.Columns.Add(new DataColumn("CurrencyValue", System.Double))
var i : int
for( i = 0; i < 9; i++){
dr = dt.NewRow()
dr("IntegerValue") = i
dr("StringValue") = "Item " + i.ToString()
dr("DateTimeValue") = DateTime.Now
dr("BoolValue") = ((i % 2) != 0) ? true : false
dr("CurrencyValue") = 1.23 *(i + 1)
dt.Rows.Add(dr)
}
var dv : DataView = new DataView(dt)
return dv
}
function Page_Load(sender : Object, e : EventArgs){
if(!IsPostBack){
RadioButtonList1.Items.Add("Non-databound item.")
RadioButtonList1.AppendDataBoundItems = true
RadioButtonList1.DataSource = CreateDataSource()
RadioButtonList1.DataTextField = "StringValue"
RadioButtonList1.DataValueField = "CurrencyValue"
RadioButtonList1.DataBind()
}
}
function Index_Changed(sender : Object, e : EventArgs){
Label1.Text = "You selected " + RadioButtonList1.SelectedItem.Text
+ " with a value of : " + RadioButtonList1.SelectedItem.Value + "."
}
</script>
<body>
<form id="Form1" runat=server>
<asp:RadioButtonList id="RadioButtonList1"
OnSelectedIndexChanged="Index_Changed"
AutoPostBack="true"
runat="server"/>
<br>
<asp:Label id="Label1" runat="server"/>
</form>
</body>
</html>
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
.NET Framework
Supported in: 2.0