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Ajax grid paging not paging serverside

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marcellus asked on 19 Aug 2020, 03:59 PM

I am attempting to have an ajax grid that does server side paging. (For reference, I am using Entity Framework for db context, and Automapper for model to view model mapping). The paging is working clientside, but it just pulls in all the data from my db then pages. I cannot seem to get the paging to reflect at the sql query level without doing it manually (which defeats the purpose of passing the request to the DataSourceResult(). Am i missing something, or must i do this manually?


Below is my current code:


Razor page

02.            .Grid<AgencyContactViewModel>()
03.            .Name("Grid")
04.            .DataSource(dataSource => dataSource
05.                .Ajax()
06.                .Read(read => read.Action("Read", "AgencyContact"))
07.                .PageSize(5)
08.                .ServerOperation(true)
09.       )
11.        .Columns(columns =>
12.         {
13.             columns.Bound(o => o.ID).Width(50).Title("Id");
14.             columns.Bound(o => o.LastName).Width(100).Title("Last Name");
15.             columns.Bound(o => o.FirstName).Width(100).Title("First Name");
16.             columns.Bound(o => o.AgencyDescription).Width(175).Title("Agency");
17.             columns.Bound(o => o.IsActiveFlag)
18.             .ClientTemplate("<input type='checkbox' #= IsActiveFlag ? checked = 'checked' : '' #  disabled='disabled' ></input>")
19.             .Width(15).Title("Active");
21.             columns.Bound(o => o.AgencyCode)
22.             .ClientTemplate("<a href='" + Url.Action("Edit", "AgencyContact") + "/#=AgencyCode#'>Edit<a/>")
23.             .Title("")
24.             .Width(15);
25.             columns.Bound(o => o.AgencyCode)
26.             .ClientTemplate("<a href='" + Url.Action("Details", "AgencyContact") + "/#=AgencyCode#'>Details<a/>")
27.             .Title("")
28.             .Width(15);
29.         })
30.        .Groupable()
31.        .Sortable()
32.        .Pageable()
33.        .Filterable())
1.public JsonResult Read([DataSourceRequest] DataSourceRequest request)
3.    var agencyContacts = dbContext.AgencyContacts.Include("Agency") .OrderBy(a => a.AgencyCode);
4.    var agencyContactsViewModel = agencyContacts.ProjectTo<AgencyContactViewModel>();
5.    var result = agencyContactsViewModel.ToDataSourceResult(request);
6.    return Json(result, JsonRequestBehavior.AllowGet);

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Veselin Tsvetanov
Telerik team
answered on 21 Aug 2020, 09:55 AM

Hi Marcellus,

As far as I can understand, you need to apply the paging within the SQL query. If that is the case, you will need to call the ToDataSourceResult(request) before mapping the db Model to the ViewModel:

var agencyContacts = dbContext.AgencyContacts.Include("Agency").OrderBy(a => a.AgencyCode);
var result = agencyContacts.ToDataSourceResult(request);
result.Data = result.Data.Cast<AgencyContact>().ProjectTo<AgencyContactViewModel>();

return Json(result, JsonRequestBehavior.AllowGet);

Any logic executed after AutoMapping (ProjectTo<>) on the mapped collection will be executed on the server and not within the query itself.

Veselin Tsvetanov
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