加入兩個表中的EntityFramework

Question

我有兩個表：

• 公司
• 的接觸，一個一對多的關係（在一個公司多次接觸）

Contacts表EDITED ：

public class Contact 
{ 
    public Guid Id { get; set; } 

    public DateTime dateCreated { get; set; } 

    public DateTime updated { get; set; } 

    public Boolean hidden { get; set; } 

    //Personal Data 

    public string title { get; set; } 

    public string jobTitle { get; set; } 

    public string firstName { get; set; } 

    public string lastName { get; set; } 

    public string department { get; set; } 

    public string email { get; set; } 

    public string logoUrl { get; set; } 

    public string personalRemarks { get; set; } 

    //Telephone list 

    public ICollection<Phone> Phones { get; set; } 

    //Addresses 

    public ICollection<Address> Addresses { get; set; } 

    //Bank Data 

    public ICollection<Bankdata> Bankdatas { get; set; } 

    //Tags 

    public ICollection<Tag> Tags { get; set; } 
} 

}

家

公司表EDITED：

public class Organization 
{ 
    public Guid Id { get; set; } 

    public DateTime dateCreated { get; set; } 

    public DateTime dateUpdated { get; set; } 

    public Boolean hidden { get; set; } 

    //Company Data 

    public string organizationName { get; set; } 

    public string taxId { get; set; } 

    public string trades { get; set; } 

    public string organizationType { get; set; } 

    public string actionRadius { get; set; } 

    public string organizationRemarks { get; set; } 

    public string web { get; set; } 

    //Contacts 

    public ICollection<Contact> Contacts { get; set; } 

    //Tags 

    public ICollection<Tag> Tags { get; set; } 

} 

}

我有一個方法，即時我的倉庫於一體的公司

public Organization GetOrganizationById(Guid Id) 
    { 
     return _context.Organizations 
      .Include(c => c.Contacts) 
      .Where(c => c.Id == Id) 
      .FirstOrDefault(); 
    } 

選擇所有的聯繫人，但因爲所有的我已經是公司ID我需要在兩個表格之間建立連接以獲取名稱。喜歡的東西：

SELECT contacts,*, Organization.name 
FROM contacts 
INNER JOIN Organization ON Organization.id = Contacts.organization_id 
WHERE Organization.id = id; 

我曾嘗試沒有成功如下：

public Organization GetOrganizationById(Guid Id) 
    { 
     return _context.Organizations 
      .Include(o => o.organizationName) 
      .Include(c => c.Contacts) 
      .Where(c => c.Id == Id) 
      .FirstOrDefault(); 
    } 

任何幫助將受到歡迎

Answer 1

正確的做法是將Organization類和Contact之間創建一個導航屬性類。下面的代碼將讓你瞭解你需要做的步驟：

public class Contact 
{ 
    ... 

    // Foreign key for Organization 
    public Guid OrganizationId { get; set; } 

    // Related Organization entity 
    [ForeignKey("OrganizationId ")] 
    public Organization Standard { get; set; } 
} 

public class Organization 
{ 
    ... 

    // List of related Contacts 
    public virtual ICollection<Contact> Contacts { get; set; } 

} 

使用此代碼創建一個遷移，你會實現你的方法，具體如下：

public Organization GetOrganizationById(Guid Id) 
{ 
    return _context.Organizations 
     .Include(c => c.Contacts) 
     .Where(c => c.Id == Id) 
     .FirstOrDefault(); 
}