DataGrid Settings and OnRender Grouping Conflict

Radzen.Blazor Components
1

Hi,

I'm running into an issue when combining the Radzen DataGrid 's settings persistence (Save/Load settings) with grouping via the OnRender event.

Example

void OnRender(DataGridRenderEventArgs<Order> args)
{
    if (args.FirstRender)
    {
        args.Grid.Groups.Add(new GroupDescriptor() 
        { 
            Property = "Employee.LastName", 
            Title = "Employee" 
        });

        StateHasChanged();
    }
}

The Problem:
When using this method to group by "Employee.LastName" during the first render, it causes the grid settings stored in localStorage to be overwritten/reset — effectively discarding any previously saved user settings.

I initially thought I could fix this by checking if the grouping already exists in the current settings:

“If "Employee.LastName" already exists in settings, do nothing — else, add it.”

However, there's a timing issue:

  • The OnRender method is triggered before LoadStateAsync has finished loading the saved settings.
  • So the grouping check is always false, and the grouping is added again → overwriting the saved state.

Has anyone found a reliable way to:

  • Add grouping dynamically via OnRender, only if it's not already saved,
  • without overwriting existing DataGrid settings?
2

In my opinion you should use OnAfterRenderAsync() override for both operations instead Render callback of the DataGrid. First you can load the settings and then check if grouping should be added.

1 Like
3

@enchev thank you for pointing to the right direction! Solved.

First of all, removed the OnRender option and then added the following option to the datagrid

@ref="@releaseNoteDataGrid"

In @code block:

adzenDataGrid<Note> releaseNoteDataGrid;

OnAfterRenderAsync

protected override async Task OnAfterRenderAsync(bool firstRender)
{
    if (firstRender)
    {
        // Get settings from Local Storage
        await LoadStateAsync();

        // Add predefined grouping if no settings
        if (_settings == null)
        {
            releaseNoteDataGrid.Groups.Add(new GroupDescriptor() { Property = "releaseDate", SortOrder = SortOrder.Descending, Title = "Release Date" });
        }

        StateHasChanged();
    }
}