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TableCell.AddAttributesToRender Method

Adds properties specific to the TableCell control to the list of attributes to render.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

Protected Overrides Sub AddAttributesToRender ( _
	writer As HtmlTextWriter _


Type: System.Web.UI.HtmlTextWriter

The output stream that renders HTML content to the client.


A cell listed as an associated header cell was not found.

The AddAttributesToRender method overrides the base class's AddAttributesToRender method and first calls the base method and then adds the TableCell attributes corresponding to the RowSpan property, the ColumnSpan property and the AssociatedHeaderCellID property. If the AssociatedHeaderCellID property refers to a TableHeaderCell that can not be found, an HttpException is thrown.

The AddAttributesToRender method is used primarily by control developers extending the functionality of the TableCell control.

Notes to Inheritors

When overriding the AddAttributesToRender method in a derived class, be sure to call the AddAttributesToRender method of the base class so that the TableCell control attributes are properly rendered.

The following code example demonstrates how to override the AddAttributesToRender method in a custom server control so that a custom title attribute is rendered for each cell.

<%@ Page Language="VB" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head2" runat="server">
    <title>Custom TableCell - AddAttributesToRender - VB.NET Example</title>
    <form id="form1" runat="server">

    <h3>Custom TableCell - AddAttributesToRender - VB Example</h3>

    <asp:Table id="Table1" runat="server" 
      CellPadding="3" CellSpacing="2">
        <aspSample:CustomTableCellAddAttributesToRender Text="(0,0)" />
        <aspSample:CustomTableCellAddAttributesToRender Text="(0,1)" />
        <aspSample:CustomTableCellAddAttributesToRender Text="(0,2)" />
        <aspSample:CustomTableCellAddAttributesToRender Text="(1,0)" />
        <aspSample:CustomTableCellAddAttributesToRender Text="(1,1)" />
        <aspSample:CustomTableCellAddAttributesToRender Text="(1,2)" />

Imports System.Web
Imports System.Security.Permissions

Namespace Samples.AspNet.VB.Controls
    <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
    Public NotInheritable Class CustomTableCellAddAttributesToRender
        Inherits System.Web.UI.WebControls.TableCell

        Protected Overrides Sub AddAttributesToRender(ByVal writer As System.Web.UI.HtmlTextWriter)

            ' Write a Title attribute.
            writer.AddAttribute("title", "CustomAddAttributesToRender")

            ' Call the base AddAttributesToRender method. 
        End Sub 
    End Class 
End Namespace

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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