无法为LINQ to Entities创建淘汰方法将LINQ to SQL中的DeleteAllOnSubmit()链接 [英] Can 't create extesion method for LINQ to Entities link DeleteAllOnSubmit() in LINQ to SQL

问题描述

因为没有用于LINQ to Entities的DeleteAllOnSubmit()方法.因此，我自己创建了它，并按以下代码为DeleteAllObjects命名.

Since there is no DeleteAllOnSubmit() method for LINQ to Entities. So I myself create it and named for DeleteAllObjects as following code.

public static void DeleleAllObjects<TEntity>(this ObjectSet<TEntity> objectSet, TEntity[] objects)
{
    foreach(var o in objects)
    {
        objectSet.DeleteObject(o);
    }
}

但是我编写的代码编译失败并显示错误消息:

However the code I write fail on compile and get the error message:

类型"TEntity"必须是引用类型，才能将其用作 通用类型或方法中的参数"TEntity"

The type 'TEntity' must be a reference type in order to use it as parameter 'TEntity' in the generic type or method

我认为始终将foreach与DeleteObject一起使用对于删除集合不是一个好主意.

I think use foreach with DeleteObject all the time is not a good idea for delete collection.

推荐答案

尝试一下.该方法必须是通用的，TEntity只是该类型的占位符.

Try this. The method needs to be a generic, TEntity is simply the placeholder for the type.

public static void DeleteAllObjects<TEntity>( this ObjectSet<TEntity> objectSet,
                                              IEnumerable<TEntity> objects)
    where TEntity : class
{

   foreach(var o in objects)
   {
      objectSet.DeleteObject(o);
   }
}

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