Control.AddParsedSubObject Method
Assembly: System.Web (in system.web.dll)
'Declaration Protected Overridable Sub AddParsedSubObject ( _ obj As Object _ ) 'Usage Dim obj As Object Me.AddParsedSubObject(obj)
protected void AddParsedSubObject ( Object obj )
protected function AddParsedSubObject ( obj : Object )
Not applicable.
Parameters
- obj
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 Control.Controls 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.
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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). |
' 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 items.Add(obj) 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 extends ControlBuilder
{
public Type GetChildControlType(String tagName, IDictionary attributes)
{
if (String.Compare(tagName, "myitem", true) == 0) {
return TextBox.class.ToType();
}
return null;
} //GetChildControlType
} //MyControlBuilder
/** @attribute ControlBuilderAttribute(MyControlBuilder.class)
*/
public class MyControl extends Control
{
// Store all the controls specified as nested tags.
private ArrayList items = new ArrayList();
// This function is internally invoked by
// IParserAccessor.AddParsedSubObject(Object).
protected void AddParsedSubObject(Object obj)
{
if (obj instanceof TextBox) {
items.Add(obj);
}
} //AddParsedSubObject
// Override 'CreateChildControls'.
protected void CreateChildControls()
{
System.Collections.IEnumerator myEnumerator = items.GetEnumerator();
while (myEnumerator.MoveNext()) {
this.get_Controls().Add((TextBox)myEnumerator.get_Current());
}
} //CreateChildControls
} //MyControl
Security Note: