Question

On the last line shown:

// Dynamically add Grid with 8 columns to the StackPanel
Grid grd = new Grid();
ColumnDefinition c0 = new ColumnDefinition(); 
c0.Width = new GridLength(1, GridUnitType.Star); 
. . .
grd.ColumnDefinitions.Add(c0);
. . .
// Add it to the StackPanel
spNufan.Children.Add(grd); // <- ka-pow!

…I get, “System.NullReferenceException was unhandled Message=Object reference not set to an instance of an object.“

Yet “grd” is created in the line:

Grid grd = new Grid();

…and spNufan (a StackPanel) is in the corresponding xaml:

<StackPanel Name="spNufan"
            Orientation="Vertical">
</StackPanel>

Why the error?

Answer 1

I would say that your code is perfectly fine, but, in my opinion, you execute it before actually XAML content is loaded and initialized, so I suppose that your

spnuFan is Null

Cause the code provided as is, seems perfectly valid to me. So consider it moving in different place of your app.

I would suggest to check this by adding a button and execute that Stack population code on Click event.

Hope this helps.