linq to entities：嵌套.Any（）

Question

在存储库中，我需要在searchCriteria（sc）中定义的其他功能集合中搜索联系人（c）的功能。表达Func键看起来是这样的：

// no Problem from here ---> 
c => c.firstName.StartsWith(sc.FirstName) 
    && c.lastName.StartsWith(sc.LastName) 
    && c.addressData.Any(a => a.City.StartsWith(sc.City)) 
    && c.addressData.Any(a => a.StreetAddr.StartsWith(sc.Street)) 
    && c.addressData.Any(a => a.ZIPCode.StartsWith(sc.ZipCode)) 
    && c.visit.Any(v=> v.vStartDate >= sc.VisitTimeIntervalStart) 
    && c.visit.Any(v => v.vStartDate <= sc.VisitTimeIntervalEnd) 
    // <-- to here but this -> 
    && c.contact2feature.Any( 
     c2f => sc.FeaturePattern.Any(  
     ` fp => fp.Item1.featureID == c2f.feature.featureID))  
// thows: System.Reflection.TargetInvocationException 
// Inner: Unable to process the type System.Tuple 2[], because it has no known mapping to the value layer. 

Answer 1

好，sc.FeaturePattern似乎是一个Tuple，这意味着它不是你的实体模型/ EDMX的一部分。所以LINQ to Entities不知道如何将其转换为SQL。但你可以很容易地解决这个问题：

// extract scalar values from tuple 
var featureIds = sc.FeaturePattern.Select(fp => fp.Item1.featureId); 

// now do query 
// ... 
c => c.firstName.StartsWith(sc.FirstName) 
    && c.lastName.StartsWith(sc.LastName) 
    && c.addressData.Any(a => a.City.StartsWith(sc.City)) 
    && c.addressData.Any(a => a.StreetAddr.StartsWith(sc.Street)) 
    && c.addressData.Any(a => a.ZIPCode.StartsWith(sc.ZipCode)) 
    && c.visit.Any(v=> v.vStartDate >= sc.VisitTimeIntervalStart) 
    && c.visit.Any(v => v.vStartDate <= sc.VisitTimeIntervalEnd) 
    // <-- to here but this -> 
    && c.contact2feature.Any( 
     c2f => featureIds.Contains(  
      fid => fid == c2f.feature.featureID))