TextBox.AddParsedSubObject Method
.NET Framework 3.0
This method supports the .NET Framework infrastructure and is not intended to be used directly from your code.
Overridden to allow only literal controls to be added as the Text property.
Namespace: System.Web.UI.WebControlsAssembly: System.Web (in system.web.dll)
| Exception type | Condition |
|---|---|
| obj is not of type LiteralControl. |
The following code example demonstrates how to override the AddParsedSubObject method in a custom server control so that it always sets the Text property to the parsed object's Text property if the parsed object is a Literal control, and throws an exception otherwise.
Security Note: |
|---|
| This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview (Visual Studio). |
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" 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 - VJ# Example</title>
</head>
<body>
<form id="Form1" method="get" runat="server" title="Custom TextBox - AddParsedSubObject - VJ# Example" lang="VJ#">
<h3>Custom TextBox - AddParsedSubObject - VJ# Example</h3>
<aspSample:CustomTextBoxAddParsedSubObject
id="TextBox1"
runat="server"
text="Hello World!">
</aspSample:CustomTextBoxAddParsedSubObject>
</form>
</body>
</html>
package Samples.AspNet.JSL.Controls;
public class CustomTextBoxAddParsedSubObject
extends System.Web.UI.WebControls.TextBox
{
protected void AddParsedSubObject(Object obj)
throws System.Web.HttpException
{
// If the object is a LiteralControl, then set this control's
// Text property.
if (obj instanceof System.Web.UI.LiteralControl) {
this.set_Text(((System.Web.UI.LiteralControl)obj).get_Text());
}
else {
throw new System.Web.HttpException("You cannot have a child "
+ "control of type "
+ obj.GetType().get_Name().ToString());
}
} //AddParsedSubObject
} //CustomTextBoxAddParsedSubObject
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