Question

我刚开始使用EF代码，所以我在本主题中是初学者。

我致力于任务管理系统。我正在处理任务和员工之间的多对多关系。有三种关系

任务 - 员工（此处员工是负责该任务的人员）
任务 - 员工（此处员工是任务完成后将收到通知的人员）
任务 - 员工（此处员工是批准任务的人员）

对于每个这样的多对多关系，我有三个表。到目前为止，我已尝试过这种方法，我收集的所有记录都是负责人而非相关记录。对方法的任何建议？我做错了什么？

代码I用于获取数据

var tasks = db1.Tasks.Include(t => t.TaskPriority).Include(t=>t.Responsible).Where(t => t.tas_status.Equals(AppGlobals.PENDING) || t.tas_status.Equals(AppGlobals.WAITING));

_

[Table("Task")]
public class Task
{
    public Task()
    {
        this.Responsible = new HashSet<Employee>();
        this.Notified = new HashSet<Employee>();
        this.Approved = new HashSet<Employee>();
    }

    [Key]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int tas_id { get; set; }
    public string tas_name {get; set;}
    public virtual ICollection<Employee> Responsible { get; set; }
    public virtual ICollection<Employee> Notified { get; set; }
    public virtual ICollection<Employee> Approved { get; set; }

}

[Table("Employee")]
public class Employee
{
    [Key]
    [Display(Name = "Employee ID")]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int emp_id { get; set; }
    [Required]
    [Display(Name = "Employee Name")]
    public string emp_name { get; set; }

    public virtual ICollection<Task> Assigned { get; set; }
    public virtual ICollection<Task> Notified { get; set; }
    public virtual ICollection<Task> Approved { get; set; }
}

[Table("TaskResponsible")]
public class TaskResponsible
{
    [Required]
    [Display(Name = "Task")]
    [Key, Column(Order = 0)]
    public int tas_id { get; set; }

    [Required]
    [Display(Name = "Person Responsible")]
    [Key, Column("emp_id", Order = 1)]
    public int emp_id { get; set; }

    public virtual Task Task { get; set; }
    public virtual Employee Responsible { get; set; }

}

[Table("TaskApproval")]
public class TaskApproval
{
    [Required]
    [Display(Name = "Task")]
    [Key, Column(Order = 0)]
    public int tas_id { get; set; }

    [Required]
    [Display(Name = "Person Approved")]
    [Key, Column(Order = 1)]
    public int emp_id { get; set; }

    public virtual Task Task { get; set; }
    public virtual Employee Approved { get; set; }
}


[Table("TaskNotified")]
public class TaskNotified
{
    [Required]
    [Display(Name = "Task")]
    [Key, Column(Order = 0)]
    public int tas_id { get; set; }

    [Required]
    [Display(Name = "Person Notified")]
    [Key, Column("emp_id", Order = 1)]
    public int emp_id { get; set; }

    public virtual Task Task { get; set; }
    public virtual Employee Notified { get; set; }
}

protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Task>()
            .HasMany(a => a.Responsible)
            .WithMany(d => d.Tasks)
            .Map(m =>
            {
                m.MapLeftKey("tas_id");
                m.MapRightKey("emp_id");
                m.ToTable("TaskResponsible");
            });
        modelBuilder.Entity<Task>()
            .HasMany(a => a.Notified)
            .WithMany(d => d.Tasks)
            .Map(m =>
            {
                m.MapLeftKey("tas_id");
                m.MapRightKey("emp_id");
                m.ToTable("TaskNotified");
            });
        modelBuilder.Entity<Task>()
            .HasMany(a => a.Approved)
            .WithMany(d => d.Tasks)
            .Map(m =>
            {
                m.MapLeftKey("tas_id");
                m.MapRightKey("emp_id");
                m.ToTable("TaskApproval");
            });
        base.OnModelCreating(modelBuilder);
    }

多个导航与相同的表多对多的关系实体framwwork

0 个答案: