Bagikan melalui

TextBox.AddParsedSubObject(Object) Metode

  • Referensi

Definisi

Ruang nama:
System.Web.UI.WebControls
Rakitan:
System.Web.dll

Ditimpa untuk memungkinkan hanya kontrol harfiah yang ditambahkan sebagai Text properti .

protected:
 override void AddParsedSubObject(System::Object ^ obj);
protected override void AddParsedSubObject (object obj);
override this.AddParsedSubObject : obj -> unit
Protected Overrides Sub AddParsedSubObject (obj As Object)

Parameter

obj
Object

Yang Object mewakili elemen yang diurai.

Pengecualian

HttpException

obj bukan berjenis LiteralControl.

Contoh

Contoh kode berikut menunjukkan cara mengambil alih AddParsedSubObject metode dalam kontrol server kustom sehingga selalu mengatur Text properti ke properti objek Text yang diurai jika objek yang diurai adalah Literal kontrol, dan melemparkan pengecualian sebaliknya.

Penting

Contoh ini memiliki kotak teks yang menerima input pengguna, yang merupakan potensi ancaman keamanan. Secara default, ASP.NET halaman Web memvalidasi bahwa input pengguna tidak menyertakan elemen skrip atau HTML. Untuk informasi selengkapnya, lihat Gambaran Umum Eksploitasi Skrip.

<%@ 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 TextBox - AddParsedSubObject - C# Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom TextBox - AddParsedSubObject - C# Example</h3>
            
            <aspSample:CustomTextBoxAddParsedSubObject 
              id="TextBox1" 
              runat="server">Hello World!
            </aspSample:CustomTextBoxAddParsedSubObject>
            
        </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 TextBox - AddParsedSubObject - VB.NET Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom TextBox - AddParsedSubObject - VB.NET Example</h3>
            
            <aspSample:CustomTextBoxAddParsedSubObject id="TextBox1" 
             runat="server">Hello World!</aspSample:CustomTextBoxAddParsedSubObject>
        </form>
    </body>
</html>

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

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomTextBoxAddParsedSubObject : System.Web.UI.WebControls.TextBox
  {
    protected override void AddParsedSubObject(object obj)
    {
      // If the object is a LiteralControl, then set this control's Text property.
      if (obj is System.Web.UI.LiteralControl) 
      {
        this.Text = ((System.Web.UI.LiteralControl)obj).Text;
      }
      else 
      {
        throw new System.Web.HttpException("You cannot have a child control of type " + obj.GetType().Name.ToString());
      }
    }
  }
}

Imports System.Web
Imports System.Security.Permissions

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

        Protected Overrides Sub AddParsedSubObject(ByVal obj As Object)

            ' If the object is a LiteralControl, then set this control's Text property.
            If TypeOf obj Is System.Web.UI.LiteralControl Then
                Me.Text = CType(obj, System.Web.UI.LiteralControl).Text
            Else
                Throw New System.Web.HttpException("You cannot have children controls of type " + obj.GetType().Name.ToString())
            End If
        End Sub
    End Class
End Namespace

Berlaku untuk

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