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ListControl.AppendDataBoundItems Property

  • Reference

Definition

Namespace:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Gets or sets a value that indicates whether list items are cleared before data binding.

C# 
[System.Web.UI.Themeable(false)]
public virtual bool AppendDataBoundItems { get; set; }

Property Value

Boolean

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.

Attributes
ThemeableAttribute

Examples

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.

ASP.NET (C#) 
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
 
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
 <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>
 
 <head runat="server">
    <title>ASP.NET Example</title>
</head>
<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>

Remarks

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.

Applies to

Производ Верзије
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1

See also