添加单个实体多个关系

Question

我有一个实体，我试图将它添加到两个不同实体的集合中。

我想要达到的目标是

[1] => DomainUser { name = "bob" }
DomainGroup.Users = [ 1 ]
LocalGroup.Users = [ 1 ]

但是，当我尝试保存更改时，我得到Multiplicity constraint violated. The role 'DomainGroup_Users_Source' of the relationship 'Server.DomainTools.Models.DomainGroup_Users' has multiplicity 1 or 0..1.

这是我的实体：

这就是我觉得我的问题所在：DomainUser

public class DomainUser 
{
    public string Name { get; set; }
    public int Id { get; set; }

    public string DisplayName { get; set; }
    public string DistinguishedName { get; set; }
    public int AdminCount { get; set; }
    public int PwdLastSet { get; set; }
    public string AdsPath { get; set; }
    public int LastLogon { get; set; }
    public int LastLogoff { get; set; }
    public int LockoutTime { get; set; }
    public int AccountExpires { get; set; }
    public int BadPwdCount { get; set; }
    public int LogonCount { get; set; }
}

以下是我尝试将DomainUser添加到的两个实体：DomainGroup和LocalGroup

public class DomainGroup
{
    public string Name { get; set; }

    public List<DomainUser> Users { get; set; }
    public List<DomainGroup> Groups { get; set; }
    public string DistinguishedName { get; set; }
    public int Id { get; set; }

    public DomainGroup()
    {
        Users = new List<DomainUser>();
        Groups = new List<DomainGroup>();
    }
}

public class LocalGroup
{
    public string Name { get; set; }
    public int Id { get; set; }

    public string DisplayName { get; set; }
    public string Comment { get; set; }
    public List<LocalUser> LocalUsers { get; set; }
    public List<DomainUser> DomainUsers { get; set; }
    public List<DomainGroup> DomainGroups { get; set; }
    public List<LocalGroup> LocalGroups { get; set; }

    public LocalGroup()
    {
        LocalUsers = new List<LocalUser>();
        LocalGroups = new List<LocalGroup>();
        DomainUsers = new List<DomainUser>();
        DomainGroups = new List<DomainGroup>();
    }
}