Question

我使用T-SQL / SQL Server相当新，我不确定如何使用Linq获得所需的结果。

从下面的代码我得到以下结果：

from com in Complaints
     join pro in Projects on com.ProjectId equals pro.ProjectId
     join cont in Contacts on com.SubContractorContactId equals cont.ContactId
     join cont2 in Contacts on com.OccupantContactId equals cont2.ContactId
     where com.EmailStatusId == null
     select new
                {
                    pro.ProjectName,
                    com.ComplaintId,
                    com.ComplaintName,
                    SubContractorName = cont.FirstName,
                    SubContractorEmail = cont.Email,
                    com.DueDate,
                    OccupantName = cont2.FirstName,
                    OccupantPhone = cont2.Phone,
                    OccupantEmail = cont2.Email
                }

我希望结果返回一个独立的项目，其中列出了每个投诉。此外，我希望在删除重复内容时对投诉中的每个联系人进行分组。因此，我希望的结果将是每个项目的一行，然后是项目内的每个投诉，以及每个投诉联系人。

为了帮助您了解我已创建此大纲。

Projects 
 - Lake Road Construction
    - Complaints
       - Foundation Cracks: ComplaintId 1, DueDate
           - Contacts
               - SubContractor
                   - Carlo
                   - CarloARosner@inbound.plus
               - Occupant
                   - William
                   - WilliamSSommerfield@inbound.plus
                   - 616-846-0467
       - Drywall: ComplaintId 2, DueDate
           - Contacts
               - SubContractor
                   * No SubContractor needed since the previous complaint has the same SubContractor.
               - Occupant
                   - Keesha
                   - KeeshaCWhitlock@inbound.plus
                   - 661-205-2018

 - Jennifer Lane Renovation
    - Complaints
       - Light Fixture: ComplaintId 3, DueDate
           - Contacts
               - SubContractor
                   - Ardith
                   - ArdithGMast@inbound.plus
               - Occupant
                   - Olivia
                   - OliviaEFournier@inbound.plus
                   - 210-530-5281
       - Plumbing: ComplaintId 4, DueDate
           - Contacts
               * Contacts have already been collected from the other complaint.

从我所读过的内容来看，我认为我需要使用＆＃34; group by new {}＆＃34;或使用UNION。但是，我不确定我需要进入的方向。任何帮助都将不胜感激。

Answer 1

这应该根据ProjectName对数据进行分组。结果是具有Project属性和Complaints属性的匿名对象列表。 Complaints媒体资源中的每个项目都有CompId和Contact属性

var groupedResults = (from co in Complaints
    join p in Projects on co.ProjectId equals p.ProjectId 
    join cont in Contacts on co.SubContractorContactId equals cont.ContactId
    join cont2 in Contacts on co.OccupanttContactId equals cont2.ContactId
            select new
            {
                ProjecttName =  p.Name,
                ComplaintId =   co.Id,                                 
                SubContractorName = cont.FirstName,
                OccupantName = cont2.FirstName
                // Fill the other properties here please                                  
            }
).GroupBy(k => k.ProjecttName, i => i, (x, b) => new
{
    Project=x,
    Complaints =b.Select(d=> new 
    {
        CompId=d.ComplaintId,
        Contacts=new  { SubContr=d.SubContractorName, Occupant = d.OccupantName}  
    })
}).ToList();

如何对结果进行分组并删除重复项

1 个答案: