使用这些课程:
public class Parent
{
public int ID { get; set; }
public ICollection<Child> Children { get; set; }
}
public class Child
{
public int ID { get; set; }
public int ParentID { get; set; }
public Parent Parent { get; set; }
}
配置如下:
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Parent>()
.HasMany(p => p.Children)
.WithRequired(c => c.Parent)
.HasForeignKey(c => c.ParentID)
.WillCascadeOnDelete(true);
}
将级联删除放在外键上:
public override void Up()
{
CreateTable(
"dbo.Children",
c => new
{
ID = c.Int(nullable: false, identity: true),
ParentID = c.Int(nullable: false),
})
.PrimaryKey(t => t.ID)
.ForeignKey("dbo.Parents", t => t.ParentID, cascadeDelete: true)
.Index(t => t.ParentID);
CreateTable(
"dbo.Parents",
c => new
{
ID = c.Int(nullable: false, identity: true),
})
.PrimaryKey(t => t.ID);
}