Question

我有下表：

id             (bigint)  
adId           (bigint)  
listId         (bigint)  
listFieldValue (bigint)

我有这个搜索列表：

List<long> searchListFieldValues = new List<long>();
searchListFieldValues.Add(100);
searchListFieldValues.Add(200);

所以我用：

using (ClearWhiteDBEntities cwContext = new ClearWhiteDBEntities())
{ 
    var adsWithRelevantadFields =
      from adField in cwContext.tblAdFields
      join ads in cwContext.tblAds on adField.adId equals ads.id
      group adField by adField.adId into adAdFields
      where searchListFieldIds.All(i => adAdFields.Select(co => co.listFieldValue).Contains(i))
      select adAdFields.Key;

    MessageBox.Show(adsWithRelevantadFields.Count().ToString());
}

但现在我需要同时检查两个字段listId和listFieldId，因此我创建了另一个搜索列表：

List<long> searchListIds = new List<long>();
searchListIds.Add(11);
searchListIds.Add(12);

现在我需要让所有adId拥有（listId == 11 && listFieldValue==100）和（listId == 12 && listFieldValue==200）

我试过了：

where searchListIds.All(i => adAdFields.Select(co => co.listId).Contains(i))
   && searchListFieldValues.All(i => adAdFields.Select(co => co.listFieldValue).Contains(i))

但它不起作用。任何解决方案？

Answer 1

如何将where条目放在group之前？

var adsWithRelevantadFields =
  from adField in cwContext.tblAdFields
  join ads in cwContext.tblAds on adField.adId equals ads.id
  where ((adField.listId == 11 && adField.listFieldValue == 100)
         || (adField.listId == 12 && adField.listFieldValue == 200)
  group adField by adField.adId into adAdFields
  select adAdFields.Key;

EF LINQ'WHERE IN'同时有2个字段

1 个答案: