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[英]Entity Framework 6 table with many foreign keys each pointing to different tables
[英]Multiple foreign keys to many tables
我有以下课程:
public class Project
{
public int ID { get; set; }
public string Name { get; set; }
...
// Navigation
public virtual IEnumerable<Task> Tasks { get; set; }
//public virtual IEnumerable<Message> Messages { get; set; } // ???
}
public class Task
{
public int ID { get; set; }
public int ProjectID { get; set; }
public string Name { get; set; }
...
// Navigation
//public virtual IEnumerable<Message> Messages { get; set; } // ???
}
public class Message
{
public int ID { get; set; }
public string Comment { get; set; }
...
// Foreign Keys ??
}
基本上:
如何编写数据库以及编写EF代码以实现此目的? 我希望能够将Linq语法用于例如。 List<Message> messages = project.Messages.ToList();
我找到了这种替代设计,但不确定导航属性的外观。
我想你几乎在那里。 你可以试试这个吗?
public class Project
{
public int ID { get; set; }
public string Name { get; set; }
...
// Navigation
public virtual IEnumerable<Task> Tasks { get; set; }
public virtual IEnumerable<Message> Messages { get; set; }
}
public class Task
{
public int ID { get; set; }
public int ProjectID { get; set; }
public string Name { get; set; }
...
// Navigation
public virtual IEnumerable<Message> Messages { get; set; }
}
public class Message
{
public int ID { get; set; }
public string Comment { get; set; }
...
public int? ProjectId {get;set;}
public int? TaskId {get;set;}
public virtual Project {get;set;}
public virtual Task {get;set;}
}
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