带有条件的EF查询使用连接的查询

Question

这是跟进to another user's question。我有5张桌子

• CompanyDetail
• CompanyContacts FK to CompanyDetail
• CompanyContactsSecurity FK to CompanyContact
• UserDetail
• UserGroupMembership FK to UserDetail

如何退还所有的公司，其中包括在同一查询联系人？我想包括包含零联系人的公司。

公司与联系人有1对多关联，但不是每个用户都被允许查看每个联系人。我的目标是获得每个公司的名单，而不管联系人的数量，但包括联系人数据。

现在，我有这方面的工作查询：

var userGroupsQueryable = _entities.UserGroupMembership 
          .Where(ug => ug.UserID == UserID) 
          .Select(a => a.GroupMembership); 

var contactsGroupsQueryable = _entities.CompanyContactsSecurity;//.Where(c => c.CompanyID == companyID); 

/// OLD Query that shows permitted contacts 
/// ... I want to "use this query inside "listOfCompany" 
/// 
//var permittedContacts= from c in userGroupsQueryable 
//join p in contactsGroupsQueryable on c equals p.GroupID 
//select p; 

然而，这是低效的，当我需要得到所有公司的所有联系人，因为我用的是For..Each循环和单独和更新查询每家公司我的视角模型。 问：如何鞋拔的permittedContacts变量上，并插入到该查询：

var listOfCompany = from company in _entities.CompanyDetail.Include("CompanyContacts").Include("CompanyContactsSecurity") 
       where company.CompanyContacts.Any(

       // Insert Query here.... 
       // b => b.CompanyContactsSecurity.Join(/*inner*/,/*OuterKey*/,/*innerKey*/,/*ResultSelector*/) 

       ) 
       select company; 

我在做这样的尝试导致：

var listOfCompany = from company in _entities.CompanyDetail.Include("CompanyContacts").Include("CompanyContactsSecurity") 
          where company.CompanyContacts.Any(


// This is concept only... doesn't work... 
from grps in userGroupsQueryable 
     join p in company.CompanyContactsSecurity on grps equals p.GroupID 
     select p 



) 
select company; 

Answer 1

也许这样的事情。

var q = from company in _entities.CompanyDetail 
     where 
     (from c in userGroupsQueryable 
     join p in contactsGroupsQueryable on c equals p.GroupID 
     where company.CompanyContacts.Any(cc => cc.pkCompanyContact == p.fkCompanyContact) 
     select p 
     ).Any() 
     select new 
     { 
      Company = company, 
      Contacts = company.CompanyContacts 
     }; 

Answer 2

以下代码查询所有公司，并仅附加用户被允许查看的联系人。我不知道这是多么有效率，或者如果有办法让它更快，但它有效。

var userGroupsQueryable = _entities.UserGroupMembership.Where(ug => ug.UserID == UserID) 
            .Select(a => a.GroupMembership); 

var  contactsGroupsQueryable = _entities.CompanyContactsSecurity; 

var listOfCompanies = 
      from company in _entities.CompanyDetail 
      select new 
      { 
       Company = company, 
       Contacts = (from c in userGroupsQueryable 
          join p in contactsGroupsQueryable on c equals p.GroupID 
          where company.CompanyContacts.Any(cc => cc.CompanyID == p.CompanyID) 
          select p.CompanyContacts) 
      };