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HtmlInputRadioButton.RenderAttributes-Methode

  • Artikel

Rendert die Attribute des HtmlInputRadioButton-Steuerelements in das angegebene HtmlTextWriter-Objekt.

Namespace: System.Web.UI.HtmlControls
Assembly: System.Web (in system.web.dll)

Syntax

'Declaration
Protected Overrides Sub RenderAttributes ( _
    writer As HtmlTextWriter _
)
'Usage
Dim writer As HtmlTextWriter

Me.RenderAttributes(writer)

protected override void RenderAttributes (
    HtmlTextWriter writer
)

protected:
virtual void RenderAttributes (
    HtmlTextWriter^ writer
) override

protected void RenderAttributes (
    HtmlTextWriter writer
)

protected override function RenderAttributes (
    writer : HtmlTextWriter
)

Parameter

Hinweise

Die RenderAttributes-Methode schreibt die Value-Eigenschaft des HtmlInputRadioButton-Steuerelements und ruft dann die RenderAttributes-Methode der Basisklasse auf.

Die RenderAttributes-Methode wird hauptsächlich von Entwicklern von Steuerelementen zum Erweitern der Funktionalität des HtmlInputRadioButton-Steuerelements verwendet.

Beispiel

Im folgenden Codebeispiel wird das Überschreiben der RenderAttributes-Methode in einem benutzerdefinierten Serversteuerelement veranschaulicht, sodass im HtmlInputRadioButton immer ein bestimmter Titel angezeigt wird.

<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Samples" Assembly="Samples.AspNet.VB" %>
<HTML>
  <HEAD><title>Custom HtmlInputRadioButton - RenderAttributes - Visual Basic Example</title>
    <script runat="server">
      Sub Page_Load(sender As Object, e As EventArgs)
        Div1.InnerHtml = ""
      End Sub

      Sub HtmlInputRadioButtonGroup1_ServerChange(sender As Object, e As System.EventArgs)
        Dim htmlInputRadioButtonGroup1 As System.Web.UI.HtmlControls.HtmlInputRadioButton  = CType(sender, System.Web.UI.HtmlControls.HtmlInputRadioButton)
        Div1.InnerHtml = "You change your selection to: " & htmlInputRadioButtonGroup1.Value
      End Sub
    </script>
  </HEAD>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom HtmlInputRadioButton - Method - Visual Basic RenderAttributes</h3>

      <aspSample:CustomHtmlInputRadioButtonRenderAttributes 
        id="HtmlInputRadioButton1" 
        name="HtmlInputRadioButtonGroup1" 
        runat="server" 
        type="radio" checked
        onserverchange="HtmlInputRadioButtonGroup1_ServerChange" 
        value="HtmlInputRadioButton1">HtmlInputRadioButton1
      </aspSample:CustomHtmlInputRadioButtonRenderAttributes>
      <br>

      <aspSample:CustomHtmlInputRadioButtonRenderAttributes 
        id="HtmlInputRadioButton2" 
        name="HtmlInputRadioButtonGroup1" 
        runat="server" 
        type="radio" 
        onserverchange="HtmlInputRadioButtonGroup1_ServerChange" 
        value="HtmlInputRadioButton2">HtmlInputRadioButton2
      </aspSample:CustomHtmlInputRadioButtonRenderAttributes><br>

      <p>
        <input type="submit" value="Submit" id="Submit1" name="Submit1" runat="server">
      </p>
      
      <DIV 
        id="Div1" 
        runat="server" 
        style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" 
        ms_positioning="FlowLayout" />
    </form>
  </body>
</HTML>

<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Samples" Assembly="Samples.AspNet.CS" %>
<HTML>
  <HEAD><title>Custom HtmlInputRadioButton - RenderAttributes - C# Example</title>
    <script runat="server">
      void Page_Load(Object sender, EventArgs e) 
      {
        Div1.InnerHtml = "";
      }

      void HtmlInputRadioButtonGroup1_ServerChange(object sender, System.EventArgs e)
      {
        // Diplay the value of the selected HtmlInputRadioButton control.
        System.Web.UI.HtmlControls.HtmlInputRadioButton htmlInputRadioButtonGroup1 = (System.Web.UI.HtmlControls.HtmlInputRadioButton) sender;
        Div1.InnerHtml = "You change your selection to: " + htmlInputRadioButtonGroup1.Value;
      }
    </script>
  </HEAD>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom HtmlInputRadioButton - Method - C# RenderAttributes</h3>

      <aspSample:CustomHtmlInputRadioButtonRenderAttributes 
        id="HtmlInputRadioButton1" 
        name="HtmlInputRadioButtonGroup1" 
        runat="server" 
        type="radio" checked
        onserverchange="HtmlInputRadioButtonGroup1_ServerChange" 
        value="HtmlInputRadioButton1">HtmlInputRadioButton1
      </aspSample:CustomHtmlInputRadioButtonRenderAttributes>
      <br>

      <aspSample:CustomHtmlInputRadioButtonRenderAttributes 
        id="HtmlInputRadioButton2" 
        name="HtmlInputRadioButtonGroup1" 
        runat="server" 
        type="radio" 
        onserverchange="HtmlInputRadioButtonGroup1_ServerChange" 
        value="HtmlInputRadioButton2">HtmlInputRadioButton2
      </aspSample:CustomHtmlInputRadioButtonRenderAttributes><br>

      <p>
        <input type="submit" value="Submit" id="Submit1" name="Submit1" runat="server">
      </p>
      
      <DIV 
        id="Div1" 
        runat="server" 
        style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" 
        ms_positioning="FlowLayout" />
    </form>
  </body>
</HTML>

<%@ Page Language="VJ#" AutoEventWireup="True" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Samples" Assembly="Samples.AspNet.JSl" %>
<HTML>
  <HEAD><title>Custom HtmlInputRadioButton - RenderAttributes - VJ# Example</title>
    <script runat="server">
    void Page_Load(Object sender, EventArgs e) 
    {
        Div1.set_InnerHtml("");
    } //Page_Load

    void HtmlInputRadioButtonGroup1_ServerChange(Object sender, 
        System.EventArgs e)
    {
        // Diplay the value of the selected HtmlInputRadioButton control.
        System.Web.UI.HtmlControls.HtmlInputRadioButton 
            htmlInputRadioButtonGroup1 = (System.Web.UI.HtmlControls.
            HtmlInputRadioButton)sender;
        Div1.set_InnerHtml("You change your selection to: " 
            + htmlInputRadioButtonGroup1.get_Value());
    } //HtmlInputRadioButtonGroup1_ServerChange
    </script>
  </HEAD>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom HtmlInputRadioButton - Method - VJ# RenderAttributes</h3>

      <aspSample:CustomHtmlInputRadioButtonRenderAttributes 
        id="HtmlInputRadioButton1" 
        name="HtmlInputRadioButtonGroup1" 
        runat="server" 
        type="radio" checked
        onserverchange="HtmlInputRadioButtonGroup1_ServerChange" 
        value="HtmlInputRadioButton1">HtmlInputRadioButton1
      </aspSample:CustomHtmlInputRadioButtonRenderAttributes>
      <br>

      <aspSample:CustomHtmlInputRadioButtonRenderAttributes 
        id="HtmlInputRadioButton2" 
        name="HtmlInputRadioButtonGroup1" 
        runat="server" 
        type="radio" 
        onserverchange="HtmlInputRadioButtonGroup1_ServerChange" 
        value="HtmlInputRadioButton2">HtmlInputRadioButton2
      </aspSample:CustomHtmlInputRadioButtonRenderAttributes><br>

      <p>
        <input type="submit" value="Submit" id="Submit1" name="Submit1" runat="server">
      </p>
      
      <DIV 
        id="Div1" 
        runat="server" 
        style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" 
        ms_positioning="FlowLayout" />
    </form>
  </body>
</HTML>

Imports System.Web
Imports System.Security.Permissions

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

        Protected Overrides Sub RenderAttributes(ByVal writer As System.Web.UI.HtmlTextWriter)

            ' Call the base class's RenderAttributes method.
            MyBase.RenderAttributes(writer)

            ' Write out the control's Title tag.
            writer.Write((" Title=""Option " + Me.Value + """"))

        End Sub
    End Class
End Namespace

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

namespace Samples.AspNet.CS.Samples
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomHtmlInputRadioButtonRenderAttributes : System.Web.UI.HtmlControls.HtmlInputRadioButton
    {
        protected override void RenderAttributes(System.Web.UI.HtmlTextWriter writer)
        {
            
            // Call the base class's RenderAttributes method.
            base.RenderAttributes(writer);

            // Write out the control's Title tag.
            writer.Write(" Title=\"Option " + this.Value + "\"");
        }
    }
}

package Samples.AspNet.JSl.Samples;

public class CustomHtmlInputRadioButtonRenderAttributes
    extends System.Web.UI.HtmlControls.HtmlInputRadioButton
{
    protected void RenderAttributes(System.Web.UI.HtmlTextWriter writer)
    {
        // Call the base class's RenderAttributes method.
        super.RenderAttributes(writer);
        // Write out the control's Title tag.
        writer.Write(" Title=\"Option " + this.get_Value() + "\"");
    } //RenderAttributes
} //CustomHtmlInputRadioButtonRenderAttributes

Plattformen

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

Siehe auch

Referenz

HtmlInputRadioButton-Klasse
HtmlInputRadioButton-Member
System.Web.UI.HtmlControls-Namespace

Weitere Ressourcen

HTML-Serversteuerelemente