包括帶的EntityFramework

Question

多個表我有3個表像下圖

而且我codefirst在C＃（自動生成）

我試圖讓模型中的實體框架IEnumerable包含每個元素的包含附件列表的實體，我希望這些附件元素包含在每個附件的AttachmentType中。

更好的示範，我需要：

IEnumerable<Registry> registries = GetTableData(); 
string oneofthedesiredname = registries 
.First() 
.Attachments 
.First() 
.AttachmentType.Name; //I want that, this definition works but its null 

與GetTableData（）方法是像

public IEnumerable<Registry> GetTableData() 
    { 
     IQueryable<Registry> _registries = _entities.Registry; 
     IEnumerable<Registry> data; 
     data = _registries 
     .Where(p=>p.IsDeleted==false) 
     .Include(p=>p.Attachments.Where(x=>x.IsDeleted==false)) 
     .AsEnumerable();//this query should have change because I cant get Attachmenttypes from this    
     return data; 
    } 

謝謝大家，您的幫助表示讚賞。

Answer 1

您還必須在查詢中添加額外的Include for AttachmentType。

public IEnumerable<Registry> GetTableData() 
{ 
    IQueryable<Registry> _registries = _entities.Registry; 

    IEnumerable<Registry> data = _registries 
     .Include(x => x.Attachments) 
     .Include("Attachments.AttachmentType") 
     // here do necessary filtering with Where() 
     // ... 

    return data; 
} 

Answer 2

使用本funcation

public IEnumerable<Registry> GetTableData() 
    { 
     IQueryable<Registry> _registries = _entities.Registry,where(m=>m.IsDeleted==false); 
     IEnumerable<Registry> data; 
     data = _registries  .Include(p=>p.Attachments.Where(x=>x.IsDeleted==false)). 
include(p=>p.AttachmentType).AsEnumerable(); 
     return data; 
    }