Implement simple background Code Template Using the inheritance relationship of classes (override the parent class method)

The advantage of Asp.net is to quickly build applications. For some of the most basic data addition, deletion, modification, and paging event or style settings, you can write a virtual method in the parent class for the subclass to call, if the subclass needs to derive a change or simply not use a method of the parent class on the basis of the template, you only need to override the method of the parent class.

experiment Code is as follows :
first, the template class is abstracted and inherited from the page class; copy Code the code is as follows: public class template: system. web. UI. page
{< br> protected override void onload (eventargs e)
{< br> base. onload (E);
If (! Ispostback)
{< br> datarefresh ();
}< BR >}< br> protected virtual void datarefresh ()
{< BR >}< br> protected virtual void grid_init (Object sender, eventargs e)
{< br> var grid = sender as gridview;
grid. allowpaging = true;
grid. pagesize = 10;
grid. pagersettings. mode = pagerbuttons. numericfirstlast;
}< br> protected virtual void grid_pageindexchanging (Object sender, gridviewpageeventargs e)
{< br> var grid = sender as gridview;
grid. pageindex = E. newpageindex;
datarefresh ();
}< BR >}

then an instance that inherits the template class ; copy Code the code is as follows: <% @ page Language =" C # "autoeventwireup =" true "codebehind =" child. aspx. CS "inherits =" webtest. child "%>

Finally, it is the key background code implementation. Here we assume that you need to modify the number of displays per page and the paging style of the grid;Copy codeThe Code is as follows: public partial class child: Template
{
Protected override void datarefresh ()
{
Grid. datasource = new logdao (). getlogsbyyearmonth ("2012", "10 ");
Grid. databind ();
}
Protected override void grid_init (Object sender, eventargs E)
{
Base. grid_init (sender, e );
Grid. pagersettings. mode = pagerbuttons. nextpreviusfirstlast;
Grid. pagesize = 15;
}
}

The above is only a way of thinking. If there is any mistake, I hope all netizens will criticize and correct it.