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HtmlTextArea.AddParsedSubObject(Object) Método

  • Referencia

Definición

Espacio de nombres:
System.Web.UI.HtmlControls
Ensamblado:
System.Web.dll

Notifica al control HtmlTextArea que se analizó un objeto y agrega el objeto al objeto HtmlTextArea de control ControlCollection.

protected:
 override void AddParsedSubObject(System::Object ^ obj);
protected override void AddParsedSubObject (object obj);
override this.AddParsedSubObject : obj -> unit
Protected Overrides Sub AddParsedSubObject (obj As Object)

Parámetros

obj
Object

Object que representa el elemento analizado.

Excepciones

HttpException

El objeto especificado por el parámetro obj sólo puede ser de tipo LiteralControl o DataBoundLiteralControl.

Ejemplos

En el ejemplo de código siguiente se muestra cómo invalidar el AddParsedSubObject método en un control de servidor personalizado HtmlTextArea para que siempre determine si el objeto analizado es del tipo LiteralControl o 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>

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

  Sub Page_Load(sender As Object, e As EventArgs)

    HtmlTextArea1.Value = "Hello Html Text Area World."

  End Sub

</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() + ".");
      }
    }
  }
}

Imports System.Web
Imports System.Security.Permissions

Namespace Samples.AspNet.VB.Controls

Public NotInheritable Class CustomHtmlTextAreaAddParsedSubObject
   Inherits System.Web.UI.HtmlControls.HtmlTextArea

        <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
        Protected Overrides Sub AddParsedSubObject(ByVal obj As Object)

            ' If the object is a LiteralControl or a DataBoundLiteralControl control, 
            ' then pass the object to the base class's AddParsedSubObject method.
            If TypeOf obj Is System.Web.UI.LiteralControl OrElse TypeOf obj Is System.Web.UI.DataBoundLiteralControl Then
                MyBase.AddParsedSubObject(obj)
            Else
                Throw New System.Web.HttpException("You cannot have a child control of type " _ 
                  & obj.GetType().Name.ToString() & ".")
            End If
        End Sub

End Class
End Namespace

Comentarios

El AddParsedSubObject método agrega un objeto al HtmlTextArea control ControlCollection si el objeto es del tipo LiteralControl o DataBoundLiteralControl; de lo contrario, se produce una HttpException excepción .

El AddParsedSubObject método lo usan principalmente los desarrolladores de controles que amplían la funcionalidad del HtmlTextArea control.

Se aplica a

Consulte también