Dynamic group by expression C#

private static Expression<Func<Menu, string>> GetGroupKey(string property)
{
    var parameter = Expression.Parameter(typeof(Menu));
    var body = Expression.Property(parameter, property);
    return Expression.Lambda<Func<Menu, string>>(body, parameter);
}

// Usage
context.Menus.GroupBy(GetGroupKey(columnName));

Source: stackoverflow.com

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