问如何通过代码访问SharePoint 2010中内容查询Web部件的分组属性？

EN

SPFile ofile = page.File;

SPLimitedWebPartManager wpColl = ofile.GetLimitedWebPartManager(System.Web.UI.WebControls.WebParts.PersonalizationScope.User);
int cont = wpColl.WebParts.Count;

Console.WriteLine("    - " + page.Name);

for (int i = 0; i < cont; i++)
{
    System.Web.UI.WebControls.WebParts.WebPart wp1 = wpColl.WebParts[i];

    Console.WriteLine("        Personal: " + wp1.ToString());
    Console.WriteLine("        - Title: " + wp1.Title);
    Console.WriteLine("        - ID: " + wp1.ID);

    if (wp1.Title.Equals("CQWP Title"))
    {
        wp1.Title = "WebPart_CQWP";
        Console.WriteLine("        - New Title " + wp1.Title);

        // ----- here I would like to add the same thing to update the Group By property (or any other property which would be useful in order to configure the CQWP (list, type of document we are filtering, etc...) ---- how can I do that?
    }

    ofile.Update();
    wpColl.SaveChanges(wp1);
}