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HtmlAnchor.OnPreRender(EventArgs) Metodo

  • Riferimento

Definizione

Spazio dei nomi:
System.Web.UI.HtmlControls
Assembly:
System.Web.dll

Genera l'evento PreRender e registra uno script client per la generazione di 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)

Parametri

e
EventArgs

Oggetto EventArgs che contiene i dati dell'evento.

Esempio

Nell'esempio di codice seguente viene illustrato come eseguire l'override del OnPreRender metodo in modo che venga sempre visualizzato un Title tag in un controllo server personalizzato 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

Si applica a