Question

我有两个简单的模型类。

Service
Attendee

每项服务可由1人或多人参加。我希望基于服务的Create和Edit视图，其中所有与会者都显示为复选框，以及何时应该从数据库中的相应服务添加或删除任何选定/未选中的视图。

我一直试图将它构建超过一周，但没有成功！任何帮助将受到高度赞赏。

这些类的代码如下。

public class Service
{
    public int ServiceID { get; set; }
    public string Problem { get; set; }

    public virtual ICollection<Attendie> AttendedBy { get; set; }
}

public class Attendie
{
    public int AttendieID { get; set; }
    public string Name { get; set; }

    public virtual Service Service { get; set; }
}

public class ServiceAttendiesDBContext: DbContext
{
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
    }
    public DbSet<Service> Services { get; set; }
    public DbSet<Attendie> Attendies { get; set; }
}

public class ServiceAttendiesInitializer : DropCreateDatabaseAlways<ServiceAttendiesDBContext>
{
    protected override void Seed(ServiceAttendiesDBContext context)
    {
        base.Seed(context);

        var attendies = new List<Attendie>
        {
            new Attendie{AttendieID=1,Name="Attendie1"},
            new Attendie{AttendieID=2,Name="Attendie2"},
            new Attendie{AttendieID=3,Name="Attendie3"}
        };

        attendies.ForEach(at => context.Attendies.Add(at));
        context.SaveChanges();

        var services = new List<Service>
        {
            new Service{ ServiceID=1,Problem="Problem1",AttendedBy=new List<Attendie>()},
            new Service{ ServiceID=2,Problem="Problem2",AttendedBy=new List<Attendie>()},
            new Service{ ServiceID=3,Problem="Problem3",AttendedBy=new List<Attendie>()}
        };

        services.ForEach(ser => context.Services.Add(ser));
        context.SaveChanges();

        services[0].AttendedBy.Add(attendies[0]);
        services[0].AttendedBy.Add(attendies[1]);
        services[1].AttendedBy.Add(attendies[2]);
        services[1].AttendedBy.Add(attendies[2]);
        services[2].AttendedBy.Add(attendies[1]);
        context.SaveChanges();

    }

MVC3多个外键值

0 个答案: