SharePoint 读取 Site Columns 的数据并绑定到DropdownList

 public void GetSiteColumns(DropDownList ddl, String siteColumn)
         {
             var fields = new SPSite(ProjectContent.SiteUrlMapping).RootWeb.Fields;
             var projectCodeXml = fields.TryGetFieldByStaticName(siteColumn).SchemaXml;
             XmlDocument xmlDoc = new XmlDocument();
             xmlDoc.LoadXml(projectCodeXml);
             XmlNode xn = xmlDoc.SelectSingleNode("Field/CHOICES");
             foreach (var xnl in xn)
             {
                 XmlElement xe = (XmlElement)xnl;
                 ddl.Items.Add(xe.InnerText);
             }
         }