copilot_contracts_1.cs

private bool ValidateObject(object obj, string[] allowedNulls = null)
{
    if (obj == null)
    {
        return false;
    }

    foreach (PropertyInfo property in obj.GetType().GetProperties())
    {
        if (property.GetIndexParameters().Length > 0)
        {
            // This property is an indexer and we cannot validate it
            continue;
        }

        var value = property.GetValue(obj);
        var canProptertyBeNull = !(allowedNulls == null) || (allowedNulls != null && allowedNulls.Contains(property.Name));
        if (value == null && !canProptertyBeNull)
        {
            return false;
        }

        if (property.PropertyType.IsClass && property.PropertyType != typeof(string))
        {
            if (typeof(IEnumerable).IsAssignableFrom(property.PropertyType))
            {
                // The property is a collection
                var enumerable = (IEnumerable)value;
                foreach (var item in enumerable)
                {
                    if (!ValidateObject(item))
                    {
                        return false;
                    }
                }
            }
            else
            {
                // The property is a class
                if (!ValidateObject(value))
                {
                    return false;
                }
            }
        }
    }

    return true;
}