【发布时间】：2021-08-21 01:09:10
【问题描述】：
我已经创建了我的上下文类，并且在 EF 中。下面是从 EF 创建脚本时遇到问题的两个实体。
为了解释Account和Post的关系，基本上1个Account可以有0个或多个Post。
以下是我特别关注的 3 个场景，因为 EF 没有正确生成脚本（据我了解）。
- 1 个帐户可以创建多个帖子。
- 1个账号可以修改多个帖子。
- 1 个帐号可以发布多个帖子。
下面是我的两个类的代码；
[Table("Account")]
public class Account : IModificationHistory
{
[Key]
public int ID { get; set; }
[Required]
[Column("firstName")] //db column name
[MaxLength(255, ErrorMessage = "First name should be 255 characters or less")]
[Display(Name = "First Name")] //displayed in UI
public string FirstName { get; set; }
[Required]
[Column("lastName")] //db column name
[MaxLength(255, ErrorMessage = "Last name should be 255 characters or less")]
[Display(Name = "Last Name")] //displayed in UI
public string LastName { get; set; }
[Required]
[Column("emailAddress")] //db column name
[MaxLength(255, ErrorMessage = "Email address should be 255 characters or less")]
[DataType(DataType.EmailAddress)] //for UI presentation only
[Display(Name = "Email Address")] //displayed in UI
[EmailAddress(ErrorMessage = "Invalid email address format")]
public string EmailAddress { get; set; }
[Required]
[Column("password")]
[DataType(DataType.Password)]
public string Password { get; set; }
[Column("status")]
public int Status { get; set; }
[Column("role")]
public int Role { get; set; }
[Column("salt")]
public string Salt { get; set; }
[Column("dateCreated")]
public DateTime DateCreated { get; set; }
[Column("dateModified")]
public DateTime DateModified { get; set; }
public List<Post> ListPost { get; set; }
}
[Table("Post")]
public class Post : IModificationHistory
{
[Key]
public int ID { get; set; }
[Required(ErrorMessage = "Title is mandatory")]
[Column("title")]
[MaxLength(255, ErrorMessage = "Title should be 255 characters or less")]
public string Title { get; set; }
[Required(ErrorMessage = "Content is mandatory")]
[Column("content")]
public string Content { get; set; }
[Column("incidentID")]
[Display(Name = "Related Incident")]
public string IncidentID { get; set; }
[Column("tagID")]
[Display(Name = "Tag")]
public string TagID { get; set; }
[Column("dateModified")]
public DateTime DateModified { get; set; }
[Column("dateCreated")]
public DateTime DateCreated { get; set; }
[Column("datePublished")]
public DateTime DatePublished { get; set; }
[Column("status")]
public int Status { get; set; }
[Column("contactGroupID")]
public int ContactGroupID { get; set; }
//foreign key reference to Account table
[Column("createdByAccountID")]
public int CreatedByAcccountID { get; set; }
//foreign key reference to Account table
[Column("modifiedByAccountID")]
public int ModifiedByAccountID { get; set; }
//foreign key reference to Account table
[Column("publishedByAccountID")]
public int PublishedByAccountID { get; set; }
public Account ModifiedByAccount { get; set; }
public Account CreatedByAccount { get; set; }
public Account PublishedByAccount { get; set; }
}
当我运行 add-migration 命令时，下面是它生成的脚本
CreateTable(
"dbo.Account",
c => new
{
ID = c.Int(nullable: false, identity: true),
firstName = c.String(nullable: false, maxLength: 255),
lastName = c.String(nullable: false, maxLength: 255),
emailAddress = c.String(nullable: false, maxLength: 255),
password = c.String(nullable: false),
status = c.Int(nullable: false),
role = c.Int(nullable: false),
salt = c.String(),
dateCreated = c.DateTime(nullable: false),
dateModified = c.DateTime(nullable: false),
})
.PrimaryKey(t => t.ID);
CreateTable(
"dbo.Post",
c => new
{
ID = c.Int(nullable: false, identity: true),
title = c.String(nullable: false, maxLength: 255),
content = c.String(nullable: false),
incidentID = c.String(),
tagID = c.String(),
dateModified = c.DateTime(nullable: false),
dateCreated = c.DateTime(nullable: false),
datePublished = c.DateTime(nullable: false),
status = c.Int(nullable: false),
contactGroupID = c.Int(nullable: false),
modifiedByAccountID = c.Int(nullable: false),
createdByAccountID = c.Int(nullable: false),
publishedByAccountID = c.Int(nullable: false),
CreatedByAccount_ID = c.Int(),
Account_ID = c.Int(),
})
.PrimaryKey(t => t.ID)
.ForeignKey("dbo.Account", t => t.CreatedByAccount_ID)
.ForeignKey("dbo.Account", t => t.modifiedByAccountID, cascadeDelete: true)
.ForeignKey("dbo.Account", t => t.publishedByAccountID, cascadeDelete: true)
.ForeignKey("dbo.Account", t => t.Account_ID)
.Index(t => t.modifiedByAccountID)
.Index(t => t.publishedByAccountID)
.Index(t => t.CreatedByAccount_ID)
.Index(t => t.Account_ID);
在脚本中，我的问题是，它创建了两列“createdByAccountID = c.Int(nullable: false)”列和“CreatedByAccount_ID = c.Int()”列，我认为它们具有相同的目的并创建了另一个额外的列“Account_ID = c.Int()”。谁能指出我在这里做错了什么？
谢谢。
【问题讨论】：
-
见这个：stackoverflow.com/q/28048251/861716。并且你必须告诉 EF 哪个 ID 列是
public List<Post>属性的反端。 -
@GertArnold：感谢您的回复。我发现我在上下文类中缺少逆属性。再次感谢。
标签： entity-framework entity-framework-6