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HtmlTextArea.AddParsedSubObject Method

This API supports the .NET Framework infrastructure and is not intended to be used directly from your code.

Notifies the HtmlTextArea control that an object was parsed and adds the object to the HtmlTextArea control's ControlCollection object.

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

protected override void AddParsedSubObject(
	Object obj
)

Parameters

obj
Type: System.Object

An Object that represents the parsed element.

ExceptionCondition
HttpException

The object specified by the obj parameter can only be of the type LiteralControl or DataBoundLiteralControl.

The AddParsedSubObject method adds an object to the HtmlTextArea control's ControlCollection if the object is of the type LiteralControl or DataBoundLiteralControl; otherwise, an HttpException is thrown.

The AddParsedSubObject method is primarily used by control developers extending the functionality of the HtmlTextArea control.

The following code example demonstrates how to override the AddParsedSubObject method in a custom HtmlTextArea server control so that it always determines whether the parsed object is of the type LiteralControl or DataBoundLiteralControl.

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ Page Language="C#" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void Page_Load(Object sender, EventArgs e)
  {
    HtmlTextArea1.Value = "Hello Html Text Area World.";
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>Custom HtmlTextArea AddParsedSubObject Example</title>
  </head>

  <body>
    <form id="Form1" 
          method="post" 
          runat="server">

      <h3>Custom HtmlTextArea AddParsedSubObject Example</h3>

      <aspSample:CustomHtmlTextAreaAddParsedSubObject 
        id="HtmlTextArea1" 
        name="HtmlTextArea1" 
        runat="server" 
        rows="4" 
        cols="50"/>

    </form>
  </body>
</html>
using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{

  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomHtmlTextAreaAddParsedSubObject : System.Web.UI.HtmlControls.HtmlTextArea
  {
    protected override void AddParsedSubObject(object obj)
    {
      // If the object is a LiteralControl or a DataBoundLiteralControl control,  
      // then pass the object to the base class's AddParsedSubObject method. 
      if (obj is System.Web.UI.LiteralControl || 
          obj is System.Web.UI.DataBoundLiteralControl)
      {
        base.AddParsedSubObject(obj);
      }
      else
      {
        throw new System.Web.HttpException("You cannot have a child control of type " 
         + obj.GetType().Name.ToString() + ".");
      }
    }
  }
}

.NET Framework

Supported in: 4.6, 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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