LinqToSql子Entiity多和運營商

Question

您好我有FEATURESET標識的數組，我的車表得到了子表作爲FeatureSets 我寫的SQL查詢像

SELECT [t0].[ID] 
FROM [dbo].[SearchResultView] AS [t0] 
Join [dbo].[VehicleFeatureSet] AS [t1] on t0.ID = t1.VehicleID 
where t1.FeatureSetID = 1 and t1.FeatureSetID= 2 and t1.FeatureSetID= 3 

我試過了。但我不能

var features = Request.QueryString["FeatureSets"].Split(',').ToList().ConvertAll(new Converter<string, int>(StrinToint)); 
IQueryable<SearchResultView> result = db.SearchResultViews.Where(m => m.Active == true); 


      foreach (var featuree in features) 
      { 
       result = result.Where(m => m.VehicleFeatureSets.Any(c => c.FeatureSetID == featuree)); 
      } 

我怎麼可以這樣寫LINQ查詢

Answer 1

我轉換我的LINQ查詢到SQL查詢。 其實，我不能寫LINQ查詢此:)幫助

SELECT Vehicle.[ID] 
     ,[Make] 
     ,[Model] 
     ,[Km] 
     ,[RegistrationYear] 
     ,[Price] 
     ,[Currency] 
     ,[AdsStartDate] 
     ,[ThumbPhoto] 
    FROM [SearchResultView] as Vehicle 
left Join VehicleFeatureSet vs on Vehicle.ID=vs.VehicleID where Vehicle.Active = 1 
AND vs.FeatureSetID IN(1,5,7,9) // 1,5,7,9 comes from array 
group by Vehicle.[ID],[Make] 
     ,[Model] 
     ,[Km] 
     ,[RegistrationYear] 
     ,[Price] 
     ,[Currency] 
     ,[AdsStartDate] 
     ,[ThumbPhoto] 
Having Count(vs.FeatureSetID) = 4 // length of my feature array 
// sb = msSql query ,StringBuilder 
// Then I used DataContext.ExecuteQuery() 
db.ExecuteQuery<SearchResultView>(sb.ToString()); 

問題固定的感謝。

Answer 2

像這樣的事情？儘管你試圖在FeatureSetId上匹配1，2和3？我保持原樣，但如果這就是你的意思，他們可以改爲OR（||）。

var results = (from r in db.SearchResultViews 
       join v in db.VehicleFeatureSet 
       on r.ID equals v.VehicleID 
       where r.Active 
        && v.FeatureSetID == 1 
        && v.FeatureSetID == 2 
        && v.FeatureSetID == 3 
       select r.ID) 
       .ToList(); 

編輯：好的，我現在已經做的是簡單地改寫你的foreach語句，你可以用下面的替換：

results = features 
    .Aggregate(results, (current, feature) => current 
     .Where(v => v.VehicleFeatureSets 
      .Any(vf => vf.VehicleFeatureSetId == feature)) 
     .ToList());