SqlException：当IDENTITY_INSERT设置为 OFF 时，无法在表 'AspNetUsers' 中插入标识列的显式值

Question

我已使用 Microsoft.AspNet.Identity 的启用迁移将 aspnetuser 表列数据类型字符串更改为 long。

使用以下迁移脚本成功创建表：

CreateTable(
"dbo.AspNetUsers",
c => new
{
Id = c.Long(nullable:false,identity:true),
Email = c.String(maxLength: 256),
EmailConfirmed = c.Boolean(nullable: false),
PasswordHash = c.String(),
SecurityStamp = c.String(),
PhoneNumber = c.String(),
PhoneNumberConfirmed = c.Boolean(nullable: false),
TwoFactorEnabled = c.Boolean(nullable: false),
LockoutEndDateUtc = c.DateTime(),
LockoutEnabled = c.Boolean(nullable: false),
AccessFailedCount = c.Int(nullable: false),
UserName = c.String(nullable: false, maxLength: 256),
FullName = c.String(nullable: false, maxLength: 50),
CreatedBy = c.Long(nullable: true),
CreatedDate = c.DateTime(),
ModifiedDate = c.DateTime(nullable: false, defaultValue: null, defaultValueSql: null),
ModifiedBy = c.Long(nullable: true),
IsDeleted = c.Boolean(nullable: false, defaultValue: false, defaultValueSql: "0")
})
.PrimaryKey(t => t.Id)
.Index(t => t.UserName, unique: true, name: "UserNameIndex");

但是当我尝试使用以下代码创建用户时，错误为"SqlException：当IDENTITY_INSERT设置为 OFF 时，无法在表'AspNetUsers'中插入标识列的显式值"。

// first we create Admin rool
var role = new Microsoft.AspNet.Identity.EntityFramework.IdentityRole();
role.Name = SuperAdminRole;
roleManager.Create(role);
//Here we create a Admin super user who will maintain the website               
var user = new ApplicationUser();
user.UserName = "Admin";
user.Email = "[e-mail]";
user.FullName = "xyz";
user.IsDeleted = false;
user.ModifiedBy = null;
user.ModifiedDate = null;
user.CreatedBy = string.Empty;
user.CreatedDate = DateTime.Now;
string userPWD = "admin_123";
var chkUser = UserManager.Create(user, userPWD);

如果有人对此有解决方案，请分享。

感谢您的快速回复！

Answer 1

我相信IDENTITY_INSERT是自动增量功能，并且设置为OFF。因此，验证字段"Id"是 sql 数据库中的标识列，并在代码第一个实体框架的"Id"列中添加以下属性

[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }