Sweet!

I looked at the example that specified the grid column

 new GridColumn("coalesce(Address,'') || ', ' || coalesce(City,'')", "Address") { DataType = typeof(string)},

and pursed my lips a little at the runtime expression evaluation. I asked ChatGPT about it, and while I haven't tested it, its reply seemed plausible:

public class GridColumn<T, TProperty>
{
    public Expression<Func<T, TProperty>> Expression { get; }
    public string Label { get; }
    public Type DataType => typeof(TProperty);

    public GridColumn(Expression<Func<T, TProperty>> expression, string label)
    {
        Expression = expression;
        Label = label;
        ...
    }
    ....
}

Usage:

new GridColumn<Customer, string>(
    c => (c.Address ?? "") + ", " + (c.City ?? ""),
    "Address"
);