EdmAssociationConstraint ::关系约束中Dependent和Principal Roles中的属性数

Question

我有EdmAssociationConstraint ::关系中的从属角色和主要角色中的属性数限制了EF 5中的此异常

我想使用数据注释修复此问题

public class Task
{
    [Key, Column(Order = 0)]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int TaskId { get; set;}
    public string Name { get; set; }
}

public class Trigger
{
    [Key, Column(Order = 0)]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int TriggerId { get; set; }
    public string Name { get; set; }

    [Key, Column(Order = 1)]
    public int TaskId { get; set; }

    [ForeignKey("TaskId")]
    public virtual Task Tasks { get; set; }
}

public class TriggerHistory
{
    [Key, Column(Order = 0)]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int TriggerHistoryId { get; set; }

    [Key, Column(Order = 1)]
    public int TaskId { get; set; }

    [ForeignKey("TaskId")]
    public virtual Task Task { get; set; }

    [Key, Column(Order = 2)]
    public int TriggerId { get; set; }

    [ForeignKey("TaskId")]
    public virtual Trigger Triggers { get; set; }

    public string Name { get; set; }
}

Answer 1

您的Trigger类具有复合键(TriggerId,TaskId).但是您的TriggerHistory具有触发器导航属性,ForeignKey仅使用TaskId属性定义.

尝试更改ForeignKeyTriggers属性,如下所示:

[ForeignKey("TriggerId,TaskId")]
public virtual Trigger Triggers { get; set; }

也许Triggers属性应该命名为"Trigger",因为这不是Trigger对象的集合.