Question

我有这些课程：

public class ContentType
{
    public int ContentTypeId{get;set;}
    public string Name{get;set;}
    public int Lang{get;set;}
    public bool IsPublished{get;set;}
    public int? ParentId { get; set; }
    public int UserId { get; set; }
    public virtual User User { get; set; }
}

public class Context : DbContext
{
public Context()
{
    base.Configuration.LazyLoadingEnabled = false;
    base.Configuration.ProxyCreationEnabled = false;
    base.Configuration.ValidateOnSaveEnabled = false;
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);
    modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
}
public DbSet<ContentType> ContentTypes { get; set; }
}

现在每个contenttype都有一个父级和一个子级列表。如何使用ef5在模型和上下文中定义它？

Answer 1

如果您希望您的contenttype类让孩子使用此代码：

public class ContentType
{
     ///other properties
     public ContentType Parent { get; set; }
     public int? ParentId { get; set; }
     public ICollection<ContentType> Childern { get; set; }
}

并像这样映射：

 protected override void OnModelCreating(DbModelBuilder modelBuilder)
 {
      modelBuilder.Entity<ContentType>()
            .HasMany(c => c.Children)
            .WithOptional(c => c.Parent)
            .HasForeignKey(c => c.ParentId);

    base.OnModelCreating(modelBuilder);

 }

你去吧..

Answer 2

您的父母和内容类型表（1 - 多（*））

public class Parent
    {
        public int Id { get; set; }
        //other properties in parent class....
        public virtual ICollection<ContentType> ContentTypes  { get; set; }
    }

    public class ContentType
    {
        public int Id { get; set; }
        //other properties...
        public int ParentId { get; set; }//..this will help us to define the relationship in fluent API
        public Parent Parent { get; set; }
    }

在您的DBContext类中..

public DbSet<Parent> Parents { get; set; }
public DbSet<ContentType> ContentTypes { get; set; }

protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
        modelBuilder.Entity<ContentType>().HasRequired(c => c.Parent).WithMany(p =>p.ContentTypes).HasForeignKey(c => c.ParentId);
    }

以同样的方式，您可以让ContentType作为父级列表的父级列表。您也可以查看此link。我希望它现在有所帮助。：）

Answer 3

我假设您的孩子和父母属于ContentType类型？

如果是这样，在基类ContentType中添加属性：

    public virtual ICollection<ContentType> Children {get;set;}
    public virtual Content Type Parent {get;set;}

然后通过例如modelBuilder [ref：http://msdn.microsoft.com/en-us/data/jj591620.aspx]或通过EntityTypeConfiguration [ref：http://msdn.microsoft.com/en-us/library/gg696117(v=vs.113).aspx]

映射链接

基本上它和你要做的任何其他关系一样。

ef5中与自身的1对多关系？

3 个答案: