How to assign the grid to a grid - xamarin.forms

Question

I new a grid object without any settings in the xaml file.
After importing the data through 'Build_Grid()' in the 'OnAppearing()', I want to assign the 'gridview' to 'Grid_Info' to display on the screen, the code 'Grid_Info = gridview' does not work.
I am wondering how to achieve my needs?
<ContentPage.Content>
<StackLayout>
<Label Text="AAA" />
<Grid x:Name="Grid_Info">
</Grid>
</StackLayout>
</ContentPage.Content>
void Build_Grid(Data data)
{
Grid gridview = new Grid();
gridview.RowDefinitions.Add(new RowDefinition() { Height = 40 });
gridview.Children.Add(data[0],0,0);
...
Grid_Info = gridview; //it does not work...
}
protected override void OnAppearing()
{
Data data = new Data();
...
Build_Grid(data);
}

Answer 1

if you've already defined the Grid in XAML there is no need to do this
Grid gridview = new Grid();
instead just reference Grid_Info directly
Grid_Info.RowDefinitions.Add(new RowDefinition() { Height = 40 });
Grid_Info.Children.Add(data[0],0,0);

Answer 2

You could try the code below. I make a Data class with view to test. It work for me.
public partial class Page3 : ContentPage
{
Data[] data;
public Page3()
{
InitializeComponent();
data = new Data[2];
data[0] = new Data { view = new Button() { BackgroundColor = Color.Red } }; //data[0]
data[1] = new Data { view = new Label() { BackgroundColor = Color.Green, Text = "Label" } };//data[1]
}
void Build_Grid(Data[] data)
{
Grid gridview = new Grid();
Grid_Info.RowDefinitions.Add(new RowDefinition() { Height = 40 });
Grid_Info.Children.Add(data[0].view, 0, 0);//show the red button
Grid_Info = gridview; //it does not work...
}
protected override void OnAppearing()
{
base.OnAppearing();
Build_Grid(data);
}
}
public class Data
{
public View view { get; set; }
}