Question

我有以下示例代码：

public class User {
    public int ID {get;set;}
    public virtual ICollection<Task> Tasks {get;set;}
}

public class Task {
    public int ID {get;set;}
    public string Description {get;set;}
    public virtual ICollection<User> Responsible {get;set;}
    public virtual ICollection<User> Accountable {get;set;}
    public virtual ICollection<User> Consulted {get;set;}
    public virtual ICollection<User> Informed {get;set;}
}

现在我可以使用流畅的API来创建这些关系，但是这会为每个属性创建一个新表：

ResponsibleID | UserID | TaskID
-------------------------------
1             | 1      | 1

AccountableID | UserID | TaskID
-------------------------------
1             | 1      | 1

etc.

但我宁愿把它们存放在一张表中：

ResponsibilityID | UserID | TaskID | Responsibility
----------------------------------------------------
1                | 1      | 1      | Responsible
2                | 1      | 1      | Accountable
3                | 3      | 1      | Consulted
4                | 17     | 1      | Informed

多对多课程应该是这样的：

public class UserTaskResponsibility {
    public ID {get;set;}
    public User User {get;set;}
    public Task Task {get;set;}
    public UserResponsibility Responsibility{get;set;}
}

public enum UserResponsibility {
    Responsible,
    Accountable,
    Consulted,
    Informed
}

编辑：使用此类我将属性更改为

public class User {
    public int ID {get;set;}
    public virtual ICollection<UserTaskResponsibility> Tasks {get;set;}
}

public class Task {
    public int ID {get;set;}
    public string Description {get;set;}
    public virtual ICollection<UserTaskResponsibility> Responsible {get;set;}
    public virtual ICollection<UserTaskResponsibility> Accountable {get;set;}
    public virtual ICollection<UserTaskResponsibility> Consulted {get;set;}
    public virtual ICollection<UserTaskResponsibility> Informed {get;set;}
}

表格在

中创建了结果

ResponsibilityID | UserID | TaskID | Responsibility | TaskTaskID | TaskTaskTaskID | TaskTaskTaskTaskID
------------------------------------------------------------------------------------------------------
1                | 1      | 1      | Responsible    | Null       | Null           | Null              
2                | 1      | 1      | Accountable    | Null       | Null           | Null              
3                | 3      | 1      | Consulted      | Null       | Null           | Null              
4                | 17     | 1      | Informed       | Null       | Null           | Null

它为集合的每个引用添加了一个额外的ID列。（负责任务，负责任务任务等）。

如何告诉这些不同的属性引用同一列？

Answer 1

您已经回答了问题！将UserTaskResponsibility类添加到您的datacontext作为新表，然后更改您的模型：

public class User {
    public int ID {get;set;}
    public virtual ICollection<UserTaskResponsibility> Links {get;set;}
}

public class Task {
    public int ID {get;set;}
    public string Description {get;set;}
    public virtual ICollection<UserTaskResponsibility> Links {get;set;}
}

EF7巩固了多对多关系

1 个答案: