获取当前页的列表中的栏

#region 获取当前页的列表中的栏
        public List<SPField> GetPageList(string listname)
        {
            SPList spList = SPContext.Current.Web.Lists[listname];
            Id = spList.ID;
            ListName = listname;

            List<SPField> typeList = new List<SPField>();

            SPSecurity.RunWithElevatedPrivileges(delegate
            {
                using (SPSite site = new SPSite(SPContext.Current.Web.Site.ID))
                {
                    using (SPWeb web = site.OpenWeb(SPContext.Current.Web.ID))
                    {
                        if (spList != null && spList.Fields.Count > 0)
                        {
                            for (int i = 0; i < spList.Fields.Count; i++)
                            {
                                SPFieldLookup fldLookup = spList.Fields[i] as SPFieldLookup;
                                bool bCountRelated = fldLookup != null && fldLookup.CountRelated;
                                bool bMcolLookup = fldLookup != null && fldLookup.IsDependentLookup &&
                                                                fldLookup.LookupList != "Docs";
                                SPFieldType t = spList.Fields[i].Type;
                                if (t == SPFieldType.Computed ||
                                    t == SPFieldType.File ||
                                    t == SPFieldType.Recurrence ||
                                    t == SPFieldType.CrossProjectLink ||
                                    t == SPFieldType.AllDayEvent)
                                {
                                    continue;
                                }
                                if (!spList.Fields[i].Reorderable &&
                                    !bCountRelated &&
                                    !(spList.Fields[i].ReadOnlyField && spList.Fields[i].Type == SPFieldType.User) &&
                                    !(bMcolLookup && !spList.Fields[i].Hidden) &&
                                    !spList.HasExternalDataSource)
                                {
                                    continue;
                                }
                                if (spList.Fields[i].Title != "GrapeCityFlowManFormListItemGUID")
                                {
                                    string type = spList.Fields[i].TypeAsString;
                                    typeList.Add(spList.Fields[i]);
                                }
                            }
                        }
                    }
                }
            });
            return typeList;
        }