Select all rows with button

Question

Hello,I would like add a context menu to my grid with "Select all rows" option.I use this code to select the rows:    public async Task OnContextMenuClick(ContextMenuClickEventArgs<AnyagRendelesListItemDto> args)    {        if (args.Item.Id == "ctxSelectAll")        {            await this.PrimaryGrid.SelectRowsByRangeAsync(0);        }    }My problem is that the select duration is ~9 seconds for only 22 rows.Can I speedup the select method?Thank you very much for help!BR, SZL

Renjith Singh Rajendran · Accepted Answer

Hi SZL,We suspect
that you are using wasm blazor application. If so, then we suggest you to
handle as like suggested in the below documentation when bind Grid with
RowSelected event to improve performance.https://blazor.syncfusion.com/documentation/datagrid/webassembly-performance#avoid-unnecessary-component-renders-after-grid-eventsPlease
check the above suggestion from your side and get back to us if you need
further assistance.Regards,Renjith R

Renjith Singh Rajendran · Answer

Hi SZL,Greetings
from Syncfusion support.We checked
this scenario by creating a sample using your shared codes. We could not
reproduce the reported 9s delay when selecting 22 rows in grid. We are
attaching the sample which we have tried in this ticket.Kindly
download and refer the attached sample and if you are still facing difficulties
then the following details would be helpful for us to proceed further.
 Share a simple issue reproducing sample for us to validate.
 Share the exact scenario you are reproducing this reported problem.
     
 Share the complete grid rendering codes and model class codes.
The
provided information will help us analyze the problem, and provide you a
solution as early as possible.Regards,Renjith RAttachment: ServerApp_39e6b69c.zip

SZL · Answer

Hello,I succeed to locate the problem. This is my grid code: @code { public virtual async Task PrimaryGridRowSelectHandler1(RowSelectEventArgs args) { // yes, it is empty } public virtual async Task PrimaryGridRowDeSelectHandler1(RowDeselectEventArgs args) { // yes, it is empty }}With the above code the select all function is slow.When I remove the RowSelected event handler, the select all function will be fast.(The content of the PrimaryGridRowSelectHandler1 does not matter, an empty block can cause the problem).Unfortunatelly I cannot reproduce this in your example, maybe some another settings and this row select handler can cause this slow select together.Thank you!BR, SZL

SZL · Answer

Hello,It seems, I find the solution. By default the grid renders in every row selected event call. PreventRender = true solves the problem.There are any disadvantage using PreventRender = true?

Thank you for help!

private void OnRowSelected(RowSelectEventArgs<Order> args)
    {
        args.PreventRender = true; //without this, you may see noticeable delay in selection with 75 rows in grid.
        SelectedOrder = args.Data;
    }