HtmlInputCheckBox.OnPreRender(EventArgs) Yöntem

Başvuru

Tanım

Ad Alanı:: System.Web.UI.HtmlControls

Bütünleştirilmiş Kod:: System.Web.dll

Önemli

Bazı bilgiler ürünün ön sürümüyle ilgilidir ve sürüm öncesinde önemli değişiklikler yapılmış olabilir. Burada verilen bilgilerle ilgili olarak Microsoft açık veya zımni hiçbir garanti vermez.

Olayı yükseltir OnPreRender(EventArgs) ve denetimi geri gönderme işlemini gerektiren bir denetim olarak kaydeder.

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)

Parametreler

e: EventArgs

EventArgs Olay verilerini içeren bir.

Örnekler

Aşağıdaki kod örneği, her HtmlInputCheckBox denetime bir Title öznitelik eklenmesi için özel bir sunucu denetiminde yönteminin nasıl geçersiz kılındığını OnPreRender gösterir.

<%@ 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 HtmlInputCheckBox - OnPreRender - C# Example</title>
    <script runat="server">
      void Button1_Click(Object sender, EventArgs e)
      {
        Div1.InnerHtml = "";

        if(HtmlInputCheckBox1.Checked == true)
        {
          Div1.InnerHtml = "You like basketball. ";
        }

        if(HtmlInputCheckBox2.Checked == true)
        {
          Div1.InnerHtml += "You like football. ";
        }

        if(HtmlInputCheckBox3.Checked == true)
        {
          Div1.InnerHtml += "You like soccer. ";
        }
      }
    </script>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom HtmlInputCheckBox - OnPreRender - C# Example</h3>
      <br />
      Enter Interests:<p>
      <aspSample:CustomHtmlInputCheckBoxOnPreRender
        id="HtmlInputCheckBox1"
        runat="server"
        type="checkbox" checked
        value="Basketball"> Basketball

      <aspSample:CustomHtmlInputCheckBoxOnPreRender
        id="HtmlInputCheckBox2"
        runat="server"
        type="checkbox"
        value="Football"> Football

      <aspSample:CustomHtmlInputCheckBoxOnPreRender
        id="HtmlInputCheckBox3"
        runat="server"
        type="checkbox"
        value="Soccer"> Soccer
      </p>
      <p>
      <input id="Button1"
        runat="server"
        type="button"
        value="Enter"
        onserverclick="Button1_Click"
        name="Button1" />
      </p>

      <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 HtmlInputCheckBox - OnPreRender - Visual Basic Example</title>
    <script runat="server">
      Sub Button1_Click(sender As Object, e As EventArgs)
        Div1.InnerHtml = ""

        If HtmlInputCheckBox1.Checked = True Then
            Div1.InnerHtml = "You like basketball. "
        End If

        If HtmlInputCheckBox2.Checked = True Then
            Div1.InnerHtml += "You like football. "
        End If

        If HtmlInputCheckBox3.Checked = True Then
            Div1.InnerHtml += "You like soccer. "
        End If
      End Sub

    </script>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom HtmlInputCheckBox - OnPreRender - Visual Basic Example</h3>
      <br />
      Enter Interests:<p>
      <aspSample:CustomHtmlInputCheckBoxOnPreRender
        id="HtmlInputCheckBox1"
        runat="server"
        type="checkbox" checked
        value="Basketball"> Basketball

      <aspSample:CustomHtmlInputCheckBoxOnPreRender
        id="HtmlInputCheckBox2"
        runat="server"
        type="checkbox"
        value="Football"> Football

      <aspSample:CustomHtmlInputCheckBoxOnPreRender
        id="HtmlInputCheckBox3"
        runat="server"
        type="checkbox"
        value="Soccer"> Soccer
      </p>
      <p>
      <input id="Button1"
        runat="server"
        type="button"
        value="Enter"
        onserverclick="Button1_Click"
        name="Button1" />
      </p>

      <br />
      <div id="Div1" runat="server"
        style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px"
        ms_positioning="FlowLayout" />
    </form>
  </body>
</html>

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

namespace Samples.AspNet.CS.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomHtmlInputCheckBoxOnPreRender : System.Web.UI.HtmlControls.HtmlInputCheckBox
    {
        protected override void OnPreRender(System.EventArgs e)
        {
            // Call the base class's OnPreRender method.
            base.OnPreRender(e);
            
            // Add a Title attribute to each HtmlInputCheckBox.
            this.Attributes.Add("title", "If you like " + this.Value + ", then select this check box.");
        }
    }
}

Imports System.Web
Imports System.Security.Permissions

Namespace Samples.AspNet.VB.Controls

    <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
    Public NotInheritable Class CustomHtmlInputCheckBoxOnPreRender
        Inherits System.Web.UI.HtmlControls.HtmlInputCheckBox

        Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs)

            ' Call the base class's OnPreRender method.
            MyBase.OnPreRender(e)

            ' Add a Title attribute to each HtmlInputCheckBox.
            Me.Attributes.Add("title", "If you like " + Me.Value + ", then select this check box.")
        End Sub
    End Class

End Namespace

Açıklamalar

OnPreRender yöntemi temel OnPreRender yöntemi geçersiz kılar. OnPreRender öncelikle denetim geliştiricileri tarafından kullanılır.

Şunlara uygulanır

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