使用通用存储库进行多对多查询

Question

有人能指出我查询多对多关系的正确方向吗？我正在尝试获取所有活跃机器操作员的列表，但我这辈子似乎无法做到这一点。

如果它有任何用处，这就是我一直在尝试的方法

public HttpResponseMessage Get()
    {
        using (DAL.Repositories.Repository<Machine> machineRepo = new DAL.Repositories.Repository<Machine>())
        using (DAL.Repositories.Repository<Operator> operatorRepo = new DAL.Repositories.Repository<Operator>())
        {
            List<int> OperatorIDs = new List<int>();
            List<Machine> Machine = new List<Machine>();

            OperatorIDs = operatorRepo.FindAll(x => x.Active).Select(y => y.ID).ToList();

            var machineOperators = machineRepo.FindAll(x => x.Active).Select(x => x.Operators.All(o => OperatorIDs.Contains(o.ID)));


            return Request.CreateResponse(HttpStatusCode.OK, machineOperators);
        }
    }

我的代码如下

public class Operator
{
    public Operator()
    {
        Machines = new HashSet<Machine>();
    }

    public int ID { get; set; }
    public string FirstName { get; set; }
    public string Surname { get; set; }
    public bool Active { get; set; }

    // Navigational Link
    public virtual ICollection<Machine> Machines { get; set; }
}

public class Machine
{
    public Machine()
    {
        Departments = new HashSet<Department>();
        Operators = new HashSet<Operator>();
    }

    public int ID { get; set; }
    public string MachineName { get; set; }
    public bool Active { get; set; }

    public ICollection<Operator> Operators { get; set; }
}

在我的 efContext 中

public MachineConfiguration()
    {
        // Key
        HasKey(x => x.ID);

        // Fields
        Property(x => x.ID).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        Property(x => x.MachineName).IsRequired();

        // Table
        ToTable("Machine");

        // Relationships
        HasMany(e => e.Operators)
            .WithMany(e => e.Machines)
            .Map(m => m.ToTable("MachineOperators")
                .MapLeftKey("MachineID")
                .MapRightKey("OperatorID"));
    }

Answer 1

试试这个：

public HttpResponseMessage Get()
{
    using (DAL.Repositories.Repository<Machine> machineRepo = new DAL.Repositories.Repository<Machine>())
    {
        var machineOperators = machineRepo.FindAll(x => x.Active).Include(x=>x.Operators).Where(x => x.Operators.All(o =>o.Active)).ToList();

        return Request.CreateResponse(HttpStatusCode.OK, machineOperators);
    }
}