HtmlInputHidden.OnPreRender(EventArgs) Méthode
Définition
Important
Certaines informations portent sur la préversion du produit qui est susceptible d’être en grande partie modifiée avant sa publication. Microsoft exclut toute garantie, expresse ou implicite, concernant les informations fournies ici.
Déclenche l’événement PreRender.
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)
Paramètres
Exemples
L’exemple de code suivant montre comment remplacer la méthode afin qu’elle applique l’encodage OnPreRender HTML à la valeur d’entrée dans un contrôle serveur personnalisé HtmlInputHidden .
<%@ 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 HtmlInputHidden - OnPreRender - C# Example</title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
HtmlInputHidden1.Value = "<Hello Html Input Hidden World.>";
}
</script>
</head>
<body onload="alert('View the source to see the HTML Hidden Input value.')">
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlInputHidden - OnPreRender - C# Example</h3>
<aspSample:CustomHtmlInputHiddenOnPreRender
id="HtmlInputHidden1"
name="HtmlInputHidden1"
runat="server"
type="hidden">
</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 HtmlInputHidden - OnPreRender - Visual Basic Example</title>
<script runat="server">
Sub Page_Load(sender As Object, e As EventArgs)
HtmlInputHidden1.Value = "<Hello HtmlInputHidden World>"
End Sub
</script>
</head>
<body onload="alert('View the source to see the HTML Hidden Input value.')">
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlInputHidden - OnPreRender - Visual Basic Example</h3>
<aspSample:CustomHtmlInputHiddenOnPreRender
id="HtmlInputHidden1"
runat="server"
type="hidden">
</form>
</body>
</html>
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomHtmlInputHiddenOnPreRender : System.Web.UI.HtmlControls.HtmlInputHidden
{
protected override void OnPreRender(System.EventArgs e)
{
// Call the base class's OnPreRender method.
base.OnPreRender(e);
// Encode the Hidden Input value as HTML.
this.Value = System.Web.HttpContext.Current.Server.HtmlEncode(this.Value);
}
}
}
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomHtmlInputHiddenOnPreRender
Inherits System.Web.UI.HtmlControls.HtmlInputHidden
Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs)
' Call the base class's OnPreRender method.
MyBase.OnPreRender(e)
' Encode the Hidden Input value as HTML.
Me.Value = System.Web.HttpContext.Current.Server.HtmlEncode(Me.Value)
End Sub
End Class
Remarques
La OnPreRender méthode est appelée juste avant le rendu du HtmlInputHidden contrôle. La OnPreRender méthode est principalement utilisée par les développeurs de contrôles qui étendent les fonctionnalités du HtmlInputHidden contrôle.