HtmlInputRadioButton.RenderAttributes(HtmlTextWriter) Methode

Referenz

Definition

Namespace:: System.Web.UI.HtmlControls

Assembly:: System.Web.dll

Wichtig

Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.

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

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)

Parameter

writer: HtmlTextWriter

Ein HtmlTextWriter, der die gerenderte Ausgabe empfängt.

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie sie die RenderAttributes Methode in einem benutzerdefinierten Serversteuerelement außer Kraft setzen, sodass für den HtmlInputRadioButtonjeweiligen Titeltext immer angezeigt wird.

<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Samples" Assembly="Samples.AspNet.CS" %>
<!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 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" />
    </form>
  </body>
</html>

<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Samples" Assembly="Samples.AspNet.VB" %>
<!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 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" />
    </form>
  </body>
</html>

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 + "\"");
        }
    }
}


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

Hinweise

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

Die RenderAttributes Methode wird hauptsächlich von Steuerelemententwicklern verwendet, die die Funktionalität des HtmlInputRadioButton Steuerelements erweitern.

Gilt für

Share via