.NET Framework Class Library
ControlAddParsedSubObject Method

Notifies the server control that an element, either XML or HTML, was parsed, and adds the element to the server control's ControlCollection object.

Namespace:   System.Web.UI
Assembly:  System.Web (in System.Web.dll)
Protected Overridable Sub AddParsedSubObject ( _
	obj As [%$TOPIC/6sd06508_en-us_VS_110_2_0_0_0_0%] _
protected virtual void AddParsedSubObject(
	[%$TOPIC/6sd06508_en-us_VS_110_2_0_1_0_0%] obj
virtual void AddParsedSubObject(
	[%$TOPIC/6sd06508_en-us_VS_110_2_0_2_0_0%]^ obj
abstract AddParsedSubObject : 
        obj:[%$TOPIC/6sd06508_en-us_VS_110_2_0_3_0_0%] -> unit  
override AddParsedSubObject : 
        obj:[%$TOPIC/6sd06508_en-us_VS_110_2_0_3_0_1%] -> unit
protected function AddParsedSubObject(
	obj : [%$TOPIC/6sd06508_en-us_VS_110_2_0_4_0_0%]


Type: SystemObject

An Object that represents the parsed element.


Unless you override it, this method automatically adds LiteralControl objects to the server control's ControlCollection object. This collection is accessible through ControlControls property.


The following example is a custom server control that uses the AddParsedSubObject method to determine if elements declared between the opening and closing tags of this control are TextBox Web server controls. If they are, they are added to an ArrayList object, items. When the overridden CreateChildControls method is called, it iterates through the ArrayList and adds each object in it to the ControlCollection of the custom server control.

Security noteSecurity 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.

' Custom ControlBuilder class. Interprets nested tag name "myitem" as a textbox. 
Public Class MyControlBuilder
   Inherits ControlBuilder

   Public Overrides Function GetChildControlType(tagName As String, _
                             attributes As IDictionary) As Type
      If String.Compare(tagName, "myitem", True) = 0 Then 
         Return GetType(TextBox)
      End If 
      Return Nothing 
   End Function 
End Class

<ControlBuilderAttribute(GetType(MyControlBuilder))> Public Class MyControl
   Inherits Control
   ' Stores all the controls specified as nested tags. 
   Private items As New ArrayList()

   ' This function is internally invoked by IParserAccessor.AddParsedSubObject(Object). 
   Protected Overrides Sub AddParsedSubObject(obj As Object)
      If TypeOf obj Is TextBox Then
      End If 
   End Sub 

  ' Override 'CreateChildControls'. 
   Protected Overrides Sub CreateChildControls()
      Dim myEnumerator As System.Collections.IEnumerator = items.GetEnumerator()
      While myEnumerator.MoveNext()
         Me.Controls.Add(CType(myEnumerator.Current, TextBox))
      End While 
   End Sub 
End Class
// Custom ControlBuilder class. Interprets nested tag name "myitem" as a textbox. 
public class MyControlBuilder : ControlBuilder 
   public override Type GetChildControlType(String tagName,
                                       IDictionary attributes)
      if (String.Compare(tagName, "myitem", true) == 0) 
         return typeof(TextBox);
      return null;

public class MyControl : Control
   // Store all the controls specified as nested tags. 
   private ArrayList items = new ArrayList();

   // This function is internally invoked by IParserAccessor.AddParsedSubObject(Object). 
   protected override void AddParsedSubObject(Object obj) 
      if (obj is TextBox) 

   // Override 'CreateChildControls'.  
   protected override void CreateChildControls()
      System.Collections.IEnumerator myEnumerator = items.GetEnumerator();
Version Information

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1