GridView AllowPaging = true，但是实现了我自己的分页，但是使用了asp.net分页器

Question

ASP.net webforms here, if I set AllowPaging=true and implement my own paging mechanism where I am fetching say 25 records at a time. I'd like to be able to use the default gridview pager, but it seems to be having trouble setting the number of pages. Is this an internal calculation where the ENTIRE dataset has to be binded for it to determine this calculation?

For instance, assume a query has 1000 rows and I want to only fetch 25 of them at a time. Does the gridview pager need to execute the 1000 rows as its datasource in order to get the correct number of pages (buttons) to display. I cant find a property allowing me to specify the number of pages, they all seem to be read only (get methods).

I want to avoid building my own pager...

Answer 1

The Effective Paging with GridView Control in ASP.NET Article describes how to implement the pagination where your gridview requests the data only for the page that is visible.

Don't be put off by the fact that the database query is executed twice. Once for the total count and another to get the page's data. For applications with high traffic or a lot of data, this approach is still more efficient than getting everything, loading into a gridview (and the view state!), sending it to the end user, and the browser loading it on the screen :).

Answer 2

That's where virtual paging comes in.

Set AllowCustomPaging to true .

In PageIndexChanging event, set VirtualItemCount and PageIndex to the proper value.

Put only the 25 rows in the DataSource , do a DataBind as usual, you're done.