Question

公司详细信息
公司联系FK to CompanyDetail
公司联系安全FK to CompanyContact
UserDetail
UserGroupMembership FK to UserDetail

如何退回所有公司并在同一查询中包含联系人？我想包括零联系的公司。

公司与联系人之间有1对多的关联，但不是每个用户都可以查看每个联系人。我的目标是获取每个公司的列表，无论联系人的数量如何，但包括联系人数据。

现在我有这个有效的查询：

 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，当我需要获得所有公司的所有联系人时，这是低效的，因为我使用For..Each循环并单独查询每个公司并更新我的viewmodel。问题：我如何窃取上面的allowedContacts变量并将其插入此查询中：

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;

我尝试这样做导致：

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

也许就是这样。

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，并仅附加允许用户查看的联系人。我不知道这是多么有效，或者是否有办法让它更快，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)
            };

带有条件的EF查询包括使用连接

2 个答案: