ValidationSummary.OnPreRender-Methode

Diese Methode unterstützt die .NET Framework-Infrastruktur und ist nicht für die direkte Verwendung in Code bestimmt.

Löst das PreRender-Ereignis aus.

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

Syntax

'Declaration
Protected Friend Overrides Sub OnPreRender ( _
    e As EventArgs _
)
'Usage
Dim e As EventArgs

Me.OnPreRender(e)

protected internal override void OnPreRender (
    EventArgs e
)

protected public:
virtual void OnPreRender (
    EventArgs^ e
) override

protected void OnPreRender (
    EventArgs e
)

protected internal override function OnPreRender (
    e : EventArgs
)

Parameter

e
Ein EventArgs, das die Ereignisdaten enthält.

Beispiel

Im folgenden Codebeispiel wird veranschaulicht, wie die OnPreRender-Methode so überschrieben wird, dass Fehlermeldungen in einem benutzerdefinierten ValidationSummary-Serversteuerelement immer mit fett formatiertem Text angezeigt werden.

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>
<%@ Page Language="VB" AutoEventWireup="True" %>
<HTML>
    <HEAD>
        <title>Custom ValidationSummary - AddAttributesToRender - VB.NET Example</title>
    </HEAD>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom ValidationSummary - AddAttributesToRender - VB.NET Example</h3>


                <TABLE id="Table1" cellPadding="4" cellspacing="0">
                    <TR>
                        <TD>
                            <TABLE id="Table2" cellPadding="4" cellspacing="0" bgColor="#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>
                        <TD vAlign="top">
                            <TABLE id="Table3" cellPadding="4" cellspacing="0" >
                                <TR>
                                    <TD><aspSample:CustomValidationSummaryAddAttributesToRender
                                        id="ValidationSummary1" runat="server" DisplayMode="BulletList"
                                        HeaderText="You must enter a value in the following fields:" />
                                    </TD>
                                </TR>
                            </TABLE>

                        </TD>
                     </TR>
                </TABLE>


        </form>
    </body>
</HTML>

...
Imports System.Web
Imports System.Security.Permissions

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

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

            ' Show the error message as bold.
            writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold")

            ' Call the Base's AddAttributesToRender method.
            MyBase.AddAttributesToRender(writer)
        End Sub
    End Class
End Namespace

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ Page Language="C#" AutoEventWireup="True" %>
<HTML>
    <HEAD>
        <title>Custom ValidationSummary - AddAttributesToRender - C# Example</title>
    </HEAD>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom ValidationSummary - AddAttributesToRender - C# Example</h3>

      <TABLE id="Table1" cellPadding="4" cellspacing="0">
        <TR>
          <TD>
            <TABLE id="Table2" cellPadding="4" cellspacing="0" bgColor="#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:CustomValidationSummaryAddAttributesToRender
              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 CustomValidationSummaryAddAttributesToRender : System.Web.UI.WebControls.ValidationSummary
  {
    protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
    {
      // Show the error message as bold.
      writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold");
      
      // Call the Base's AddAttributesToRender method.
      base.AddAttributesToRender(writer);
    }
  }
}

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" AutoEventWireup="True" %>
<HTML>
    <HEAD>
        <title>Custom ValidationSummary - AddAttributesToRender - VJ# Example</title>
    </HEAD>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom ValidationSummary - AddAttributesToRender - VJ# Example</h3>

      <TABLE id="Table1" cellPadding="4" cellspacing="0">
        <TR>
          <TD>
            <TABLE id="Table2" cellPadding="4" cellspacing="0" bgColor="#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:CustomValidationSummaryAddAttributesToRender
              id="ValidationSummary1" 
              runat="server" 
              DisplayMode="BulletList" 
              HeaderText="You must enter a value in the following fields:" />
          </TD>
        </TR>
      </TABLE>


        </form>
    </body>
</HTML>

...
package Samples.AspNet.JSL.Controls; 

public class CustomValidationSummaryAddAttributesToRender
    extends System.Web.UI.WebControls.ValidationSummary
{
    protected void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
    {
        // Show the error message as bold.
        writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight,
            "bold");
        // Call the Base's AddAttributesToRender method.
        super.AddAttributesToRender(writer);
    } //AddAttributesToRender
} //CustomValidationSummaryAddAttributesToRender

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

ValidationSummary-Klasse
ValidationSummary-Member
System.Web.UI.WebControls-Namespace

Last updated on 2007-08-20

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