如何对结果进行分组并删除重复项

我对使用T-SQL/SQL Server相当陌生，而且我不确定如何使用Linq获得期望的结果。如何对结果进行分组并删除重复项

从下面的代码，我得到如下结果：

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 
       }

我想结果与其中列出的每个投诉返回一个不同的项目。此外，我希望在投诉中对每个联系人进行分组，同时删除重复内容。因此，对于每个项目，我希望得到的结果是单行的，然后是项目内的每个投诉，并在每个投诉联系人内。

为了帮助您理解我创建了这个大纲。

Projects 
- Lake Road Construction 
    - Complaints 
     - Foundation Cracks: ComplaintId 1, DueDate 
      - Contacts 
       - SubContractor 
        - Carlo 
        - [email protected] 
       - Occupant 
        - William 
        - [email protected] 
        - 616-846-0467 
     - Drywall: ComplaintId 2, DueDate 
      - Contacts 
       - SubContractor 
        * No SubContractor needed since the previous complaint has the same SubContractor. 
       - Occupant 
        - Keesha 
        - [email protected] 
        - 661-205-2018 

- Jennifer Lane Renovation 
    - Complaints 
     - Light Fixture: ComplaintId 3, DueDate 
      - Contacts 
       - SubContractor 
        - Ardith 
        - [email protected] 
       - Occupant 
        - Olivia 
        - [email protected] 
        - 210-530-5281 
     - Plumbing: ComplaintId 4, DueDate 
      - Contacts 
       * Contacts have already been collected from the other complaint.

从我读过的内容看，我认为我需要使用“group by new {}”或使用UNION。不过，我不确定我需要的方向。任何帮助将不胜感激。

来源

2016-04-02 Travis Boatman

这应该根据ProjectName对您的数据进行分组。结果是具有Project属性和Complaints属性的匿名对象的列表。在Complaints财产的每个项目都有一个CompId和Contact财产

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();

来源

2016-04-03 00:16:02 Shyju

你是一个生命的救星！我从来没有想过这样做。看起来我需要刷新我的Linq/Lambda。 –

如何对结果进行分组并删除重复项

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