asp.net-mvc-5 – 使用Fluent迁移器将初始行添加到表中

获取编译错误：当前上下文中不存在USERNAME
我应该添加什么来使用部分或任何示例：
Insert.IntoTable方法？

(谢谢)

namespace SampleApp.Migrations
{
    [Migration(1)]
    public class AuthMigrations:Migration
    {
        public override void Up()
        {
            Create.Table("users").
                WithColumn("ID").AsInt32().Identity().PrimaryKey().
                WithColumn("USERNAME").AsString(128).
                WithColumn("EMAIL").AsCustom("VARCHAR(128)").
                WithColumn("PASSWORD_HASH").AsString(128);

            Create.Table("roles").
                WithColumn("ID").AsInt32().Identity().PrimaryKey().
                WithColumn("NAME").AsString(128);

            Create.Table("role_users").
                WithColumn("ID").AsInt32().Identity().PrimaryKey().
                WithColumn("USER_ID").AsInt32().ForeignKey("users","ID").OnDelete(Rule.Cascade).
                WithColumn("ROLE_ID").AsInt32().ForeignKey("roles","ID").OnDelete(Rule.Cascade);

            //Error:The name 'USERNAME' does not exist in the current context

            Insert.IntoTable("users").Row(new { USERNAME:"superadmin",EMAIL:"superadmin@mvcapp.com",PASSWORD_HASH:"dfgkmdglkdmfg34532+"});
            Insert.IntoTable("users").Row(new { USERNAME:"admin",EMAIL:"admin@mvcapp.com",PASSWORD_HASH:"dfgkmdglkdmfg34532+"});
        }

        public override void Down()
        {
            Delete.Table("role_users");
            Delete.Table("roles");
            Delete.Table("users");
        }

    }

和

namespace SampleApp.Models
{
    public class User
    {
        public virtual int Id { get; set; }
        public virtual string Username { get; set; }
        public virtual string EMail { get; set; }
        public virtual string passwordhash { get; set; }
    }

    public class UserMap : ClassMapping<User>
    {
        public UserMap()
        {
            Table("Users");
            Id(x => x.Id,x => x.Generator(Generators.Identity));
            Property(x => x.Username,x => x.NotNullable(true));
            Property(x => x.EMail,x => x.NotNullable(true));
            Property(x=>x.passwordhash,x=>
            {
                x.Column("PASSWORD_HASH");
                x.NotNullable(true);
            });
        }
    }
}