HtmlInputButton.RenderAttributes(HtmlTextWriter) Metodo
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Esegue il rendering degli attributi nel writer specificato, quindi chiama il metodo RenderAttributes(HtmlTextWriter).
protected:
override void RenderAttributes(System::Web::UI::HtmlTextWriter ^ writer);
protected override void RenderAttributes (System.Web.UI.HtmlTextWriter writer);
override this.RenderAttributes : System.Web.UI.HtmlTextWriter -> unit
Protected Overrides Sub RenderAttributes (writer As HtmlTextWriter)
Parametri
- writer
- HtmlTextWriter
Oggetto HtmlTextWriter che riceve il contenuto di cui è stato eseguito il rendering.
Esempio
Nell'esempio di codice seguente viene illustrato come eseguire l'override del OnPreRender metodo in un controllo server personalizzato in modo che il testo del titolo specifico, accessibile come descrizione comando, venga sempre visualizzato per .HtmlInputButton
<%@ 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 HtmlInputButton - RenderAttributes - C# Example</title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
HtmlInputButton1.Attributes.Add("onclick","alert('Hello client-side world.');");
}
void HtmlInputButton1_ServerClick(Object sender, EventArgs e)
{
Div1.InnerHtml = "Hello server-side world.";
}
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlInputButton - RenderAttributes - C# Example</h3>
<aspSample:CustomHtmlInputButtonRenderAttributes
id="HtmlInputButton1"
runat="server"
type="button"
onserverclick="HtmlInputButton1_ServerClick"
value="Html Input Button"
name="HtmlInputButton1">
<div id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</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 HtmlInputButton - RenderAttributes - Visual Basic Example</title>
<script runat="server">
Sub Page_Load(sender As Object, e As EventArgs)
HtmlInputButton1.Attributes.Add("onclick", "alert('Hello client-side world.');")
End Sub
Sub HtmlInputButton1_ServerClick(sender As Object, e As EventArgs)
Div1.InnerHtml = "Hello server-side world."
End Sub
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlInputButton - RenderAttributes - Visual Basic Example</h3>
<aspSample:CustomHtmlInputButtonRenderAttributes
id="HtmlInputButton1"
runat="server"
type="button"
onserverclick="HtmlInputButton1_ServerClick"
value="Html Input Button"
name="HtmlInputButton1">
<div id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</form>
</body>
</html>
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomHtmlInputButtonRenderAttributes : System.Web.UI.HtmlControls.HtmlInputButton
{
protected override void RenderAttributes(System.Web.UI.HtmlTextWriter writer)
{
// Call the base class's RenderAttributes method.
base.RenderAttributes(writer);
// Write out the HtmlInputButton control's Title tag.
writer.Write(" Title=\"Text from RenderAttributes.\"");
}
}
}
Imports System.Web
Imports System.Security.Permissions
Namespace Samples.AspNet.VB.Controls
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomHtmlInputButtonRenderAttributes
Inherits System.Web.UI.HtmlControls.HtmlInputButton
Protected Overrides Sub RenderAttributes(ByVal writer As System.Web.UI.HtmlTextWriter)
' Call the base class's RenderAttributes method.
MyBase.RenderAttributes(writer)
' Write out the HtmlInputButton control's Title tag.
writer.Write(" Title=""Text from RenderAttributes.""")
End Sub
End Class
End Namespace
Commenti
Il RenderAttributes metodo esegue l'override del metodo .method di base HtmlControl.RenderAttributes. RenderAttributes viene usato principalmente dagli sviluppatori di controlli.