Question

给出两个对象：

public class Region
{
    public Guid Id { get; set; }

    [Key]
    public int RegionId { get; set; }

    public string Name { get; set; }

    public virtual ICollection<District> Districts { get; set; }
}

和

public class District
{
    public Guid Id { get; set; }

    [Key]
    public int DistrictId { get; set; }

    public string Name { get; set; }

    public virtual ICollection<Building> Buildings { get; set; }

    public int RegionId { get; set; }
    public Region Region { get; set; }
}

在dbContext中如下：

        modelBuilder.Entity<Region>()
            .HasMany(d => d.Districts);
        modelBuilder.Entity<Region>()
            .HasIndex(b => b.RegionId)
            .IsUnique()
            .HasName("Index_RegionId");

        modelBuilder.Entity<District>()
            .HasIndex(d => d.DistrictId)
            .IsUnique()
            .HasName("Index_DistrictId");
        modelBuilder.Entity<District>()
            .HasOne(p => p.Region)
            .WithMany(d => d.Districts)
            .HasForeignKey(r => r.RegionId);

运行迁移并创建数据库后，我想从SQL中填充数据库，例如：

INSERT INTO [dbo].[Regions](RegionId, Name) 
VALUES 
  (
    1, 'Some Region'
  );

在CREATE TABLE语句中可以执行以下操作：ID UNIQUEIDENTIFIER DEFAULT NEWID()。如何在CodeFirst中为无PK字段自动生成Guid？我应该在DBContext类中写什么，或者如何解决？

在CodeFirst中自动为无PK字段生成Guid

0 个答案: