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How to implement a client callback instance (C #) without refreshing the new page-msdn learning notes

Source: Internet
Author: User
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I often look for a variety of materials on the Internet to solve a specific problem. However, the final result is still good at msdn. Unfortunately, most of them are not in Chinese, and there are not many instance-type materials, however, msdn still requires us to study it carefully! <% @ 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/xhtml"   >
< Head Runat = "Server" >
< Script Type = "Text/JavaScript" >
Function Lookupstock ()
{
VaR LB = Document. Forms [ 0 ]. Listbox1;
VaR Product = LB. Options [lb. selectedindex]. Text
Callserver (product, "" );
}

Function Receiveserverdata (Rvalue)
{
Results. innertext = Rvalue;
}
</ Script >
</ Head >
< Body >
< Form ID = "Form1" Runat = "Server" >
< Div >
< ASP: ListBox ID = "Listbox1" Runat = "Server" > </ ASP: ListBox >
< BR />
< BR />
< Button Onclick = "Lookupstock ()" > Look up stock </ Button >
< BR />
< BR />
Items in stock: < Span ID = "Results" > </ Span >
< BR />
</ Div >
</ Form >
</ Body >
</ Html > 1 Using system;
2 Using system. Data;
3 Using system. configuration;
4 Using system. collections;
5 Using system. Web;
6 Using system. Web. Security;
7 Using system. Web. UI;
8 Using system. Web. UI. webcontrols;
9 Using system. Web. UI. webcontrols. webparts;
10 Using system. Web. UI. htmlcontrols;
11
12 Public partial class clientcallback: system. Web. UI. Page,
13 System. Web. UI. icallbackeventhandler
14 {
15 Protected system. Collections. Specialized. listdictionary Catalog;
16 Protected void page_load (Object sender, eventargs E)
17 {
18 String cbreference =
19 Page. clientscript. getcallbackeventreference (this,
20 "Arg", "receiveserverdata", "context ");
21 String callbackscript;
22 Callbackscript = "function callserver (ARG, context)" +
23 "{" + Cbreference + "};";
24 Page. clientscript. registerclientscriptblock (this. GetType (),
25 "Callserver", callbackscript, true );
26
27 Catalog = new system. Collections. Specialized. listdictionary ();
28 Catalog. Add ("Monitor", 12 );
29 Catalog. Add ("laptop", 10 );
30 Catalog. Add ("keyboard", 23 );
31 Catalog. Add ("Mouse", 17 );
32
33 Listbox1.datasource = Catalog;
34 Listbox1.datatextfield = "key ";
35 Listbox1.databind ();
36 }
37
38 Public String raisecallbackevent (string eventargument)
39 {
40 String returnvalue;
41 If (catalog [eventargument] = NULL)
42 {
43 Returnvalue = "-1 ";
44 }
45 Else
46 {
47 Returnvalue = catalog [eventargument]. tostring ();
48 }
49 Return returnvalue;
50 }
51 }

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