如何为一对多LINQ联接正确设置模型和dbcontext

Question

考虑一下：

公司型号：

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

报告模型：

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

company2report（一个公司可以有许多报告）：

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，那就很简单：

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

所以这是我的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，除了失败
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

（请参阅第3行的第一个联接），它生成COMPANY2REPORT而不是COMPANY2REPORTS

因此，我尝试将c2r模型调整为如下所示：

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
如何使我的模型与上下文配合使用，然后与联接配合使用？

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更新：
下面提供的答案是正确的
但我想在理论上进行澄清：
这是因为我将我的模式与关系db Fkeys与对象关联混合在一起

最后，我选择了对象关联
我调整了模型和代码，使其看起来像这样：

公司型号：

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

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

报告模型：

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已删除

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

如果要在这两个实体之间创建一对多关系，则模型将如下所示：

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; }
}

一个公司有很多报告，每个报告都有一个公司。 该关系表示如下：

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

也可以从关系的另一端开始进行配置：

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; }
}