如何為一對多LINQ聯接正確設置模型和dbcontext

Question

考慮一下：

公司型號：

public int id { get; set; }
public string name{ get; set; }

報告模型：

public int id { get; set; }
public string title { get; set; }

company2report（一個公司可以有許多報告）：

public int id { get; set; }
public int companyID { get; set; }
public int reportID{ get; set; }
public int sortorder{ get; set; }

dbcontext是：

public DbSet<company> companies { get; set; }
public DbSet<report> reports { get; set; }
public DbSet<company2report> company2reports { get; set; }

如果我想在sql中加入它，那就很簡單：

SELECT *
FROM   companies as c
INNER JOIN company2reports as c2r ON c.id = c2r.companyID
INNER JOIN reports as r ON c2r.reportID = r.id
ORDER BY c2r.sortorder ASC

所以這是我的linq

    var q = (from c in db.companies
              join c2r in db.company2reports on c.id equals c2r.companyID
              join r in db.hreports on c2r.reportID equals r.id
              orderby c2r.sortorder
              select new {
                     c.id, c.name,
                     r.id, r.title
                 });

一切都很好，除了失敗
生成的sql如下所示：

SELECT c.id, c.name, r.id, r.title
FROM   companies as c
INNER JOIN company2report as c2r ON c.id = c2r.companyID
INNER JOIN reports as r ON c2r.reportID = r.id
ORDER BY c2r.sortorder ASC

（請參閱第3行的第一個聯接），它生成COMPANY2REPORT而不是COMPANY2REPORTS

因此，我嘗試將c2r模型調整為如下所示：

public int id { get; set; }
public int companyID { get; set; }
public int reportID{ get; set; }
public ICollection<report> reports { get; set; }
public int sortorder{ get; set; }

更糟的是
如何使我的模型與上下文配合使用，然后與聯接配合使用？

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更新：
下面提供的答案是正確的
但我想在理論上進行澄清：
這是因為我將我的模式與關系db Fkeys與對象關聯混合在一起

最后，我選擇了對象關聯
我調整了模型和代碼，使其看起來像這樣：

公司型號：

public class company
{
    public int id { get; set; }
    public string name { get; set; }

    // navigation properties
    public ICollection<report> reports { get; private set; }
}

報告模型：

public class report
{
    public int id { get; set; }
    public string title { get; set; }
    public int companyId { get; set; }
    public short sortorder { get; set; }

    // navigation properties
    public virtual company company { get; set; }
}

company2report已刪除

的DbContext：

    public DbSet<company> companies { get; set; }
    public DbSet<report> reports { get; set; }
    //public DbSet<company2report> company2reports { get; set; }

LINQ：

        var q = from c in db.companies
                join r in db.reports on c.id equals r.companyId
                where c.id == 4
                orderby r.sortorder
                select r;

Answer 1

如果要在這兩個實體之間創建一對多關系，則模型將如下所示：

public class Company
{
    public int Id { get; set; }
    public string Name { get; set; }
    public ICollection<Report> Reports { get; set; }
}

public class Report
{
    public int Id { get; set; }
    public string Title { get; set; }
    public int? CompanyId { get; set; }
    public Company Company { get; set; }
}

一個公司有很多報告，每個報告都有一個公司。 該關系表示如下：

protected override void OnModelCreating(Modelbuilder modelBuilder)
{
    modelBuilder.Entity<Company>()
        .HasMany(c => c.Reports)
        .WithOne(e => e.Company);
}

也可以從關系的另一端開始進行配置：

protected override void OnModelCreating(Modelbuilder modelBuilder)
{
    modelBuilder.Entity<Report>()
        .HasOne(e => e.Company)
        .WithMany(c => c.Reports);
}

和dbContext

public class SampleContext : DbContext
{
    public DbSet<Company> Companies { get; set; }
    public DbSet<Report> Reports { get; set; }
}