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>();         
  
        } 
  
}