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ValidationSummary.Render(HtmlTextWriter) Metoda

Definice

Odesílá obsah ovládacích prvků serveru do zadaného HtmlTextWriter objektu, který zapisuje obsah, který se má vykreslit na klientovi.

protected:
 override void Render(System::Web::UI::HtmlTextWriter ^ writer);
protected public:
 override void Render(System::Web::UI::HtmlTextWriter ^ writer);
protected override void Render (System.Web.UI.HtmlTextWriter writer);
protected internal override void Render (System.Web.UI.HtmlTextWriter writer);
override this.Render : System.Web.UI.HtmlTextWriter -> unit
Protected Overrides Sub Render (writer As HtmlTextWriter)
Protected Friend Overrides Sub Render (writer As HtmlTextWriter)

Parametry

writer
HtmlTextWriter

Výstupní datový proud, který vykreslí obsah HTML klientovi.

Příklady

Následující příklad kódu ukazuje, jak přepsat metodu Render ve vlastním serverovém ovládacím prvku tak, aby ValidationSummary byl ovládací prvek obklopen značkou Small .

Důležité

Tento příklad obsahuje textové pole, které přijímá vstup uživatele, což je potenciální bezpečnostní hrozba. Ve výchozím nastavení ASP.NET webové stránky ověřují, že uživatelský vstup neobsahuje skript nebo elementy HTML. Další informace najdete v tématu Přehled zneužití skriptů.

<%@ 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 ValidationSummary - Render - C# Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom ValidationSummary - Render - C# Example</h3>

      <table id="Table1" cellpadding="4" cellspacing="0">
        <tr>
          <td>
            <table id="Table2" cellpadding="4" cellspacing="0" style="background-color:#eeeeee">
              <tr>
                <td colspan="3"><b>Credit Card Information</b> </td>
              </tr>
              <tr>
                <td align="right">Card Type: </td>
                <td>
                  <asp:RadioButtonList id="RadioButtonList1" runat="server" RepeatLayout="Flow">
                      <asp:ListItem>MasterCard</asp:ListItem>
                      <asp:ListItem>Visa</asp:ListItem>
                  </asp:RadioButtonList>
                </td>
                <td align="center" rowspan="1">
                  <asp:RequiredFieldValidator 
                    id="RequiredFieldValidator1" 
                    runat="server" 
                    ErrorMessage="Card Type" 
                    Width="100%" 
                    Display="Static" 
                    ControlToValidate="RadioButtonList1">*
                  </asp:RequiredFieldValidator>
                </td>
              </tr>
              <tr>
                <td align="right">Card Number: </td>
                <td><asp:TextBox id="TextBox1" runat="server"></asp:TextBox></td>
                <td>
                  <asp:RequiredFieldValidator 
                    id="RequiredFieldValidator2" 
                    runat="server" 
                    ErrorMessage="Card Number" 
                    Width="100%" 
                    Display="Static" 
                    ControlToValidate="TextBox1">*
                  </asp:RequiredFieldValidator>
                </td>
              </tr>
              <tr>
                <td></td>
                <td><asp:Button id="Button1" runat="server" text="Validate"></asp:Button></td>
                <td></td>
              </tr>
            </table>
          </td>
        </tr>
        <tr>
          <td valign="top">
            <aspSample:CustomValidationSummaryRender
              id="ValidationSummary1" 
              runat="server" 
              DisplayMode="BulletList" 
              HeaderText="You must enter a value in the following fields:" />
          </td>
        </tr>
      </table>

        </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 ValidationSummary - Render - VB.NET Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom ValidationSummary - Render - VB.NET Example</h3>

            <table id="Table1" cellpadding="4" cellspacing="0">
                <tr>
                    <td>
                        <table id="Table2" cellpadding="4" cellspacing="0" style="background-color:#eeeeee">
                            <tr>
                                <td colspan="3"><b>Credit Card Information</b> </td>
                            </tr>
                            <tr>
                                <td align="right">Card Type: </td>
                                <td><asp:RadioButtonList id="RadioButtonList1" runat="server" RepeatLayout="Flow">
                                        <asp:ListItem>MasterCard</asp:ListItem>
                                        <asp:ListItem>Visa</asp:ListItem>
                                    </asp:RadioButtonList>
                                </td>
                                <td align="center" rowspan="1">
                                    <asp:RequiredFieldValidator id="RequiredFieldValidator1" 
                                        runat="server" ErrorMessage="Card Type" Width="100%" 
                                        Display="Static" ControlToValidate="RadioButtonList1">*</asp:RequiredFieldValidator>
                                </td>
                            </tr>
                            <tr>
                                <td align="right">Card Number: </td>
                                <td><asp:TextBox id="TextBox1" runat="server"></asp:TextBox></td>
                                <td>
                                    <asp:RequiredFieldValidator id="RequiredFieldValidator2" 
                                        runat="server" ErrorMessage="Card Number" Width="100%" 
                                        Display="Static" ControlToValidate="TextBox1">*</asp:RequiredFieldValidator>
                                </td>
                            </tr>
                            <tr>
                                <td></td>
                                <td><asp:Button id="Button1" runat="server" text="Validate"></asp:Button></td>
                                <td></td>
                            </tr>
                        </table>
                    </td>
                </tr>
                <tr>
                    <td valign="top">
                        <aspSample:CustomValidationSummaryRender
                         id="ValidationSummary1" runat="server" DisplayMode="BulletList" 
                         HeaderText="You must enter a value in the following fields:" />
                    </td>
                </tr>
            </table>

        </form>
    </body>
</html>
using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomValidationSummaryRender : System.Web.UI.WebControls.ValidationSummary
  {
    protected override void Render(System.Web.UI.HtmlTextWriter writer)
    {
      // Write out begining Small HTML tag.
      writer.RenderBeginTag(System.Web.UI.HtmlTextWriterTag.Small);

      // Call the base class's Render method.
      base.Render(writer);

      // Write out ending Small HTML tag.
      writer.RenderEndTag();
    }
  }
}
Imports System.Web
Imports System.Security.Permissions

Namespace Samples.AspNet.VB.Controls
    <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
    Public NotInheritable Class CustomValidationSummaryRender
        Inherits System.Web.UI.WebControls.ValidationSummary

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

            ' Write out begining Small HTML tag.
            writer.RenderBeginTag(System.Web.UI.HtmlTextWriterTag.Small)

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

            ' Write out ending Small HTML tag.
            writer.RenderEndTag()
        End Sub
    End Class
End Namespace

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