Datagrid doesn't initialize when tab change

Radzen.Blazor Components
1

I have Tabs with tabItem that have Datagrid each.
And i wanted to get a data when the tab change.
So i have set OnTabsChanged Parameter to get data from database.

<RadzenTabs @ref="@Tabs" @bind-SelectedIndex="selectedTab" Change="@(args => OnTabChanged(args))">

OnTabChanged calls Inquire and Inquire gets data for each grid's datasource.

private void Inquire()
{
switch (selectedTab)
{
case 0:
GridData_Inquire(ref grid1_data, 1);
break;
case 1:
GridData_Inquire(ref grid2_data, 2);
break;
case 2:
ArchiveManagement_Inquire();
break;

    }
}

And. here's a problem.
If i click second tab to see grid2, the grid 2 is not initialized so grid2.Reload() causes null reference exception.
So i put grid2.Reload() inside of AfterRendered lifecycle event to reload grid2 when it's initialized.

protected override void OnAfterRender(bool firstRender)
{
if (firstRender)
{
isInitializing = false;

        GridData_Inquire(ref grid1_data, 1);
    }
    switch (selectedTab + 1)
    {
        case 1:
            grid1.Reload();
            //grid1.Count = grid1_data.Count; //Tried due to documentation said you should set count. 
            break;                                            //If i use LoadData(But i didn't used...)
        case 2:
            grid2.Reload();
            //grid2.Count = grid2_data.Count;
            break;
        case 3:

            break;

        default:
            break;
    }
}

And.... yes it doesn't worked.

So i leave a topic here.
How should i get a data, and set a data to datagrid, and reload the grid?

  • Datas are synchronously get from database with dapper and ado.net.
2

You can use LoadData event to set data and count to variables and bind these variables to respective properties.

3

Thank you for reply.

Summary for me and others.
Don't just set datasource of grid.
Let DataGrid do it.
To do.

<RadzenGrid @ref="@grid1" TItem="DataGridModel"
  Data="grid1_data" LoadData="@Inquire" Count="@grid_data.Count">

And you can get Grid's data by grid1.Reload();