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HtmlAnchor.OnPreRender(EventArgs) Método

  • Referencia

Definición

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

Genera el evento PreRender y registra el script de cliente para generar un postback.

protected:
 override void OnPreRender(EventArgs ^ e);
protected public:
 override void OnPreRender(EventArgs ^ e);
protected override void OnPreRender (EventArgs e);
protected internal override void OnPreRender (EventArgs e);
override this.OnPreRender : EventArgs -> unit
Protected Overrides Sub OnPreRender (e As EventArgs)
Protected Friend Overrides Sub OnPreRender (e As EventArgs)

Parámetros

e
EventArgs

Objeto EventArgs que contiene los datos del evento.

Ejemplos

En el ejemplo de código siguiente se muestra cómo invalidar el OnPreRender método para que siempre muestre una Title etiqueta en un control de servidor personalizado HtmlAnchor .

<%@ 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">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>Custom HtmlAnchor - OnPreRender - C# Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      Top of Page
      <<aspSample:CustomHtmlAnchorOnPreRender
           id="HtmlAnchor1"
           runat="server"
           name="HtmlAnchor1">HtmlAnchor1</aspSample:CustomHtmlAnchorOnPreRender>>

      <h3>Custom HtmlAnchor - OnPreRender - C# Example</h3>
      <p> </p>
      <p>Jump to <a href="#HtmlAnchor2">HtmlAnchor2</a> below.</p>

      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>

      <p>Jump to <a href="#HtmlAnchor1">HtmlAnchor1</a> above.</p>
      <p> </p>Bottom of Page
      <<aspSample:CustomHtmlAnchorOnPreRender
           id="HtmlAnchor2"
           runat="server"
           name="HtmlAnchor2">HtmlAnchor2</aspSample:CustomHtmlAnchorOnPreRender>>
    </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">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>Custom HtmlAnchor - OnPreRender - Visual Basic Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      Top of Page
      <<aspSample:CustomHtmlAnchorOnPreRender
           id="HtmlAnchor1"
           runat="server"
           name="HtmlAnchor1">HtmlAnchor1</aspSample:CustomHtmlAnchorOnPreRender>>

      <h3>Custom HtmlAnchor - OnPreRender - Visual Basic Example</h3>
      <p> </p>
      <p>Jump to <a href="#HtmlAnchor2">HtmlAnchor2</a> below.</p>

      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>
      <p> </p><p> </p><p> </p><p> </p>

      <p>Jump to <a href="#HtmlAnchor1">HtmlAnchor1</a> above.</p>
      <p> </p>Bottom of Page
      <<aspSample:CustomHtmlAnchorOnPreRender
           id="HtmlAnchor2"
           runat="server"
           name="HtmlAnchor2">HtmlAnchor2</aspSample:CustomHtmlAnchorOnPreRender>>
    </form>
  </body>
</html>

using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomHtmlAnchorOnPreRender : System.Web.UI.HtmlControls.HtmlAnchor
    {
        protected override void OnPreRender(System.EventArgs e)
        {
            // Call the base OnPreRender method.
            base.OnPreRender(e);

            // Write out the HtmlAnchor control's Title tag.
            this.Title = "Text from OnPreRender.";
        }
    }
}

Imports System.Web
Imports System.Security.Permissions

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

        Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs)

            ' Call the base OnPreRender method.
            MyBase.OnPreRender(e)

            ' Write out the HtmlAnchor control's Title tag.
            Me.Title = "Text from OnPreRender."
        End Sub
    End Class
End Namespace

Se aplica a