[英]Linq To Sql Skip Take
我想將每個圖標路徑保存到一個變量中,從下面的查詢中,只有PathIcon1具有value。 剩余路徑圖標為空
詢問
using (CarteringServiceClientDataContext dc = new CarteringServiceClientDataContext())
{
result = (from a in dc.GetTable<tblSupplier>()
join b in dc.GetTable<tblCity>()
on a.CityId equals b.Id
join c in dc.GetTable<tblZone>()
on b.ZoneId equals c.Id
let r = (from re in dc.GetTable<tblClientReview>()
where re.SupplierId == a.Id
select re.note).Average()
let i = (from im in dc.GetTable<tblSupplierItem>()
where im.SupplierId == a.Id
select im.tblItem.IconPath).ToArray()
select new SearchResult
{
CompanyId = a.Id,
CompanyName = a.Company,
Localisation = a.Locality,
City = b.Name,
Zone = c.Name,
Rating = r.ToString(),
PathIcon1 = i.Take(1).SingleOrDefault(),
PathIcon2 = i.Skip(1).Take(1).SingleOrDefault(),
PathIcon3 = i.Skip(2).Take(1).SingleOrDefault(),
PathIcon4 = i.Skip(3).Take(1).SingleOrDefault(),
PathIcon5 = i.Skip(4).Take(1).SingleOrDefault()
}).ToList<SearchResult>();
}
來自PathIcon1的一部分,其余的PathIcon為null
using (CarteringServiceClientDataContext dc = new CarteringServiceClientDataContext())
{
result = (from a in dc.GetTable<tblSupplier>()
join b in dc.GetTable<tblCity>()
on a.CityId equals b.Id
join c in dc.GetTable<tblZone>()
on b.ZoneId equals c.Id
let r = (from re in dc.GetTable<tblClientReview>()
where re.SupplierId == a.Id
select re.note).Average()
let i = (from im in dc.GetTable<tblSupplierItem>()
where im.SupplierId == a.Id
select im.tblItem.IconPath).ToArray().Add("test")
select new SearchResult
{
CompanyId = a.Id,
CompanyName = a.Company,
Localisation = a.Locality,
City = b.Name,
Zone = c.Name,
Rating = r.ToString(),
PathIcon1 = i.Take(1).SingleOrDefault(),
PathIcon2 = i.Skip(1).Take(1).SingleOrDefault(),
PathIcon3 = i.Skip(2).Take(1).SingleOrDefault(),
PathIcon4 = i.Skip(3).Take(1).SingleOrDefault(),
PathIcon5 = i.Skip(4).Take(1).SingleOrDefault()
}).ToList<SearchResult>();
}
如果獲得PathIcon2值作為“測試”,請嘗試執行此操作,以解決問題。 我只列出一個項目。 阿德,我是這樣認為的。
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