Defines the behavior for an extender control.
public interface class IExtenderControl
public interface IExtenderControl
type IExtenderControl = interface
Public Interface IExtenderControl
Extender controls that derive from the ExtenderControl class require a ScriptManager control to be on the page. The ExtenderControl base class performs an explicit test to make sure that a ScriptManager control exists on the page.
However, if you want to create extender controls and the page does not contain an ScriptManager control, you can create a class that implements the IExtenderControl interface directly. Additionally, if you are creating a class that derives from Control or you are extending an existing control that derives from Control, you can implement the IExtenderControl interface to support client functionality.
The IExtenderControl interface registers the script libraries for a control by calling the GetScriptReferences method, and it registers ScriptDescriptor objects by calling the GetScriptDescriptors method. The GetScriptDescriptors method returns an IEnumerable list of ScriptDescriptor objects.
To create an extender control by implementing IExtenderControl, you do the following:
Write code for the control's
OnInitevent to detect and use the ScriptManager control if it is available on the page.
Provide protected virtual members for IExtenderControl members.
Provide instance script as a script block that you register with the ScriptManager control. You must do this during the control's
Register the script descriptors during the control's
If the page contains an UpdatePanel control, the page must contain a ScriptManager control. You must implement the IExtenderControl interface only when the page does not contain a ScriptManager control.