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Use icallbackeventhandle to implement Ajax-like refreshing pages

Source: Internet
Author: User
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Let's take a look at this example in msdn library 2005!
------ Clientcallback. aspx ------ <% @ page Language = "C #" autoeventwireup = "true" codefile = "clientcallback. aspx. cs" inherits = "clientcallback" %>

<! Doctype HTML public "-// W3C // dtd xhtml 1.1 // en" "http://www.w3.org/TR/xhtml11/DTD/ xhtml11.dtd">

<HTML xmlns = "http://www.w3.org/1999/xhtm l">
<Head id = "head1" runat = "server">
<Title> callback test </title>
<SCRIPT type = "text/JavaScript">
Function receiveserverdata (receivedstr, context)
{
Alert (receivedstr );
}
</SCRIPT>
</Head>
<Body>
<Form ID = "form1" runat = "server">
<Input type = "button" value = "Callback" onclick = "callserver ('argument', 'context')"/> <br/>
</Form>
</Body>
</Html>

-------- Clientcallbacp. aspx. CS ----------- // clientcallback. aspx. CS
Using system;
Using system. Data;
Using system. configuration;
Using system. collections;
Using system. Web;
Using system. Web. Security;
Using system. Web. UI;
Using system. Web. UI. webcontrols;
Using system. Web. UI. webcontrols. webparts;
Using system. Web. UI. htmlcontrols;

Public partial class clientcallback: system. Web. UI. Page, system. Web. UI. icallbackeventhandle R
{

Void page_load (Object sender, eventargs E)
{
Clientscriptmanager CM = page. clientscript;
String cbreference = cm. getcallbackeventreference (this, "Arg", "eseserverdata ","");
String callbackscript = "function callserver (ARG, context) {" + cbreference + ";}";
Cm. registerclientscriptblock (this. GetType (), "callserver", callbackscript, true );
}

Private string returnstr;
// Function called by client, executed on server
Public void raisecallbackevent (string eventargument)
{
// Do something with return argument
Returnstr = eventargument. toupper ();
Return;
}

// Function that sends result?
Public String getcallbackresult ()
{
Return returnstr;
}
}

The client uses javaseserverdata to receive the data returned by the server,
<SCRIPT type = "text/JavaScript">
Function receiveserverdata (receivedstr, context)
{
Alert (receivedstr );
}
</SCRIPT>

Use callserver ('argument', 'context') to transmit data to the server.

The client is OK, followed by the server,
Implement the icallbackeventhandle interface,
Private string returnstr;
Public void raisecallbackevent (string eventargument)
{
Returnstr = eventargument. toupper ();
Return;
}

Public String getcallbackresult ()
{
Return returnstr;
}

Finally, associate the client method with the server method and implement it in page_load,
Clientscriptmanager CM = page. clientscript;
String cbreference = cm. getcallbackeventreference (this, "Arg", "eseserverdata ","");
String callbackscript = "function callserver (ARG, context) {" + cbreference + ";}";
Cm. registerclientscriptblock (this. GetType (), "callserver", callbackscript, true );

Success!

This method can also achieve a non-refreshing page like Ajax, and it is very simple to implement.

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