Question

我如何返回一个唯一的列表'listColl'我尝试使用底部的'Distinct9'和'return listColl;'但收到一个错误。但它没有工作。目前，这将返回一个重复的项目列表，其中填充了在查询中编码的树视图。

        public List<SPList> GetAllLibraries(string webURL)
    {
        var listColl = new List<SPList>();
        ClientContext _ctx = new ClientContext(webURL);
        try
        {
            var currentWeb = _ctx.Web;
            var AllLists = currentWeb.Lists;
            _ctx.Load(AllLists);
            _ctx.ExecuteQuery();
            var query = from list in currentWeb.Lists
                        where list.BaseType == BaseType.DocumentLibrary
                        select list;

            var listCollection = _ctx.LoadQuery(query.Include(myList => myList.Title,
                                          myList => myList.Id,
                                          myList => myList.RootFolder.ServerRelativeUrl,
                                          myList => myList.ParentWebUrl,
                                          myList => myList.Hidden,
                                          myList => myList.IsApplicationList));
            _ctx.ExecuteQuery();

          //   /*
            listColl.AddRange(from list in listCollection
                              where !list.Hidden
                              select new SPList
                              {
                                  Title = list.Title,
                                  ListGUID = list.Id.ToString(),
                                  RootFolderServerRelativeUrl = list.RootFolder.ServerRelativeUrl,
                                  ParentWebUrl = list.ParentWebUrl
                              });
       // } */
            foreach (var Item in listCollection)
            {
                listColl.Add(new SPList
                {
                    Title = Item.Title,
                    RootFolderServerRelativeUrl = Item.RootFolder.ServerRelativeUrl,
                    ListGUID = Item.Id.ToString()
                });
            }
        }
        catch (Exception ex)
        {
            // error log
            string error = ex.Message + " Error within GetAllLibraries ";
        }
        return listColl;
    }

Answer 1

你能这样做吗？

  return listColl.Distinct();

Answer 2

listColl.AddRange((from list in listCollection
                          where !list.Hidden
                          select new SPList
                          {
                              Title = list.Title,
                              ListGUID = list.Id.ToString(),
                              RootFolderServerRelativeUrl = list.RootFolder.ServerRelativeUrl,
                              ParentWebUrl = list.ParentWebUrl
                          }).Distinct());

Answer 3

快速解决方案同时解决了这个问题。我不能做Distinct（）的原因是因为SPList。

    List<SPList> distinct = new List<SPList>();
    List<String> ids = new List<string>();
    foreach (var lst in listColl)
    {
        if (!ids.Contains(lst.ListGUID))
        {
            distinct.Add(lst);
            ids.Add(lst.ListGUID);
        }
    }
return distinct;

返回asp-mvc4列表中的不同项

3 个答案: