Creating a Page Property Parameter


using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace MyControls
{
    public class PagePropertyParameter : Parameter
    {
        private string _propertyName;

        protected override object Evaluate(HttpContext context, Control control)
        {
            return DataBinder.Eval(control.Page, PropertyName);
        }

        public string PropertyName
        {
            get { return _propertyName; }
            set { _propertyName = value; }
        }

    }
}
          

File: ShowPagePropertyParameter.aspx

<%@ Page Language="C#" %>
<%@ Register TagPrefix="custom" Namespace="MyControls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
   "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">
    Public ReadOnly Property CurrentUsername() As String
        Get
            Return User.Identity.Name
        End Get
    End Property

</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Show Page Property Parameter</title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:FormView
        id="frmGuestbook"
        DataSourceID="srcGuestbook"
        DefaultMode="Insert"
        Runat="server">
        <InsertItemTemplate>
        <asp:Label
            ID="lblComment"
            Text="Comment:"
            AssociatedControlID="txtComment"
            Runat="server" />
        <asp:TextBox
            id="txtComment"
            Text='<%# Bind("comment") %>'
            TextMode="MultiLine"
            Runat="server" />
        <asp:Button
            id="btnInsert"
            Text="Add Entry"
            CommandName="Insert"
            Runat="server" />
        </InsertItemTemplate>
    </asp:FormView>
    <asp:GridView
        id="grdGuestbook"
        DataSourceID="srcGuestbook"
        CssClass="guestbook"
        Runat="server" />

    <asp:ObjectDataSource
        id="srcGuestbook"
        TypeName="YourDataSource"
        SelectMethod="Getter"
        Runat="server">
        <InsertParameters>
        <custom:PagePropertyParameter
            Name="Username"
            PropertyName="CurrentUsername" />
        </InsertParameters>
    </asp:ObjectDataSource>
    </form>
</body>
</html>

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Creating a Page Property Parameter : ObjectDataSource « ADO.net Database « ASP.Net

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