关闭EF4.x Code First的级联删除Cascade Delete

EF4.1~4.3 Code First模式级联删除是默认打开的，在同一个实体多次引用另一个实体时，需要单独设置关闭某个外键关系下的级联删除，需要写Fluent API代码，而且级联删除有时会造成麻烦。干脆整个关了吧：

 using System.Data.Entity.ModelConfiguration.Conventions;

public class MyDbContext : DbContext

{

        protected override void OnModelCreating(DbModelBuilder modelBuilder)

        {

            modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();

            modelBuilder.Conventions.Remove<ManyToManyCascadeDeleteConvention>();        

        }

}