Question

实体框架代码优先：

假设我想创建表关系，哪里是放置代码的好地方？

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<table1>().HasMany(i => i.AllowedDestinations).WithMany(d => d.something)
      ......

或OnModelCreating以外的其他地方？

Answer 1

您可以创建一个名为“MYEntityConfiguration”的类（其中MyEntity是您尝试配置的实体类型），并从EntityTypeConfiguration＆lt;＆gt;继承。在实体框架中找到的类型。

例如......

public class Position
    {
        public int Id { get; set; }

        public string CompanyName { get; set; }

        public bool IsCurrentRole { get; set; }

        public string Summary { get; set; }

        public string Title { get; set; }

        public int? StartMonth { get; set; }

        public int? StartYear { get; set; }

        public int? EndMonth { get; set; }

        public int? EndYear { get; set; }

        public virtual User User { get; set; }
        public int UserId { get; set; }
    }

和相应的配置文件......

public class PositionConfiguration : EntityTypeConfiguration<Position>
{
    public PositionConfiguration()
    {
        this.ToTable("Positions");
        this.HasKey(p => p.Id);
        this.Property(p => p.Id).HasColumnName("PositionId").HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);

        this.Property(p => p.CompanyName).HasColumnName("CompanyName");
        this.Property(p => p.EndMonth).IsOptional().HasColumnName("EndMonth");
        this.Property(p => p.EndYear).IsOptional().HasColumnName("EndYear");
        this.Property(p => p.IsCurrentRole).IsOptional().HasColumnName("IsCurrentRole");
        this.Property(p => p.StartMonth).IsOptional().HasColumnName("StartMonth");
        this.Property(p => p.StartYear).IsOptional().HasColumnName("StartYear");

        this.Property(p => p.Summary).HasColumnName("Summary");
        this.Property(p => p.Title).HasColumnName("Title");
    }
}

然后在你的DBContext中... OnModelCreating ...

protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Configurations.Add(new PositionConfiguration());

            base.OnModelCreating(modelBuilder);
        }

这将使您的配置保持良好且包含......我发现它是最好的方式。

在EF中建立关系

1 个答案: