我首先生成实体框架数据库（EF Designer from database）。我在Microsoft SQL Server中有两个表:

CREATE TABLE dbo.Person
(
    Pk_Person_Id INT IDENTITY PRIMARY KEY,
    Name VARCHAR(255),
    EmailId VARCHAR(255),
);

CREATE TABLE dbo.PassportDetails
(
    Pk_Passport_Id INT PRIMARY KEY,
    Passport_Number VARCHAR(255),
    Fk_Person_Id INT UNIQUE 
       FOREIGN KEY REFERENCES dbo.Person(Pk_Person_Id)
);

INSERT INTO dbo.Person 
VALUES ('Niraj','v.a@emails.com'),
       ('Vishwanath','v.v@emails.com'),
       ('Chetan','c.v@emails.com');
GO

INSERT INTO dbo.PassportDetails 
VALUES (101, 'C3031R33', 1), (102, 'VRDK5695', 2), (103, 'A4DEK33D', 3);
GO

SELECT * FROM dbo.Person
SELECT * FROM dbo.PassportDetails;

在SQL Server中，关系显示为一对一关系，因为设置为:

Fk_Person_Id INT UNIQUE 
     FOREIGN KEY REFERENCES dbo.Person(Pk_Person_Id));

现在在Visual Studio中，我添加了一个新的ADO.NET实体数据模型&>数据库中EF设计器-&>选中这两个表，默认情况下保留所有复选框选项。

生成结束后，我在Visual Studio关系图中看到以下内容:

而且这种关系已经改变为一对多--为什么？这有错吗？我不想让一个人拥有一大堆护照--这不是我想要描述的逻辑。

和EF代码:

public partial class Person
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public Person()
    {
        this.PassportDetails = new HashSet<PassportDetail>();
    }

    public int Pk_Person_Id { get; set; }
    public string Name { get; set; }
    public string EmailId { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<PassportDetail> PassportDetails { get; set; }
}

public partial class PassportDetail
{
    public int Pk_Passport_Id { get; set; }
    public string Passport_Number { get; set; }
    public Nullable<int> Fk_Person_Id { get; set; }

    public virtual Person Person { get; set; }
}

上下文

public partial class LightCRMEntities : DbContext
{
    public LightCRMEntities() : base("name=LightCRMEntities")
    {
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        throw new UnintentionalCodeFirstException();
    }

    public virtual DbSet<PassportDetail> PassportDetails { get; set; }
    public virtual DbSet<Person> People { get; set; }
}