Ajax toolkit Control Learning Series (14) -- scriptmanagerproxy

• Usage: When masterpage or custom control is available
• Reason for use: a page has only one scriptmanager. If masterpage or custom usercontrol is used, multiple scriptmanagers may exist on the page after the page is introduced, which is not allowed.
• Introduction: we need a proxy to implement our needs.

1. When masterpage uses scriptmanager, scriptmanagerproxy is used in the referenced page if necessary.
2. When scriptmanagerproxy is put in usercontrol, the page that introduces the custom page is scriptmanager.

• So how can we determine whether there is a scriptmanager on the page.

 Code 

     Protected     Void  Btn_onclick ( Object  Sender, eventargs E)
{
Scriptmanager x  =  Scriptmanager. getcurrent (  This  );
  If  (X  =     Null  )
{
  //  No scriptmangager  
 }
  Else   
{
  //  Do have  
  }
} 

 

• In this way, we can use the above method to determine its existence.