EF~为IEnumerable接口添加增删查等操作,原因是IEnumerable导航属性更放心_.NET_编程开发_程序员俱乐部

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EF~为IEnumerable接口添加增删查等操作,原因是IEnumerable导航属性更放心

 2013/10/28 18:58:24  张占岭  博客园  我要评论(0)
  • 摘要:回到目录对EF开发来说,导航属性肯定都用过,事实上,它是由VSIDE工具根据你的数据库关系结构自动生成的外键属性,在类视图中可以看到相关属性,它是以外键表名来标识的,如果是一对多的关系,那么,它会为属性加上ICollection泛型集合用来标识,而今天我们要说的当然不是自动生成的,而是手动加的属性,这样属性需要我们手动进行join,然后把它按需赋值,而使用include当然是无效的,呵呵。一般地,我们习惯上把集合属性定义为List<T>,但是,对于linqtoentities来说
  • 标签: 原因 操作 接口

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对EF开发来说,导航属性肯定都用过,事实上,它是由VS IDE工具根据你的数据库关系结构自动生成的外键属性,在类视图中可以看到相关属性,它是以外键表名来标识的,如果是一对多的关系,那么,它会为属性加上ICollection泛型集合用来标识,而今天我们要说的当然不是自动生成的,而是手动加的属性,这样属性需要我们手动进行join,然后把它按需赋值,而使用include当然是无效的,呵呵。

一般地,我们习惯上把集合属性定义为List<T>,但是,对于linq to entities来说,这个东西并不是很受欢迎,而标准结果集大家都知道是IEnumerable<T>,它是所有集合的基类,自身只提供了集合遍历的方法,这也是我们不用它作为导航属性的原因,因为我们一般需要为导航集合赋值的,而使用IEnumerable赋值就比较麻烦,需要借助List等集合。

引入IEnumerable的原因主要是List无法实现一个复杂的查询,如图:

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" alt="" />

这个查询返回一个派生类型,下面的复杂查询将会用到上面的结果,而这时,List类型的导航属性将是不被允许的

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" alt="" />

我们通过监视器可以看到,查询返回的默认是IEnumerable,所以,我们要属性改为IEnumerable,结果当然是正常的

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" alt="" />

而我们之前不用IEnumerable的原因,就是因为它的方法太单调了,没有添加,移除,查找等方法,而这时,不用它又不行,所以,只能把它进行扩展了,呵呵

扩展方法如下:

/// <summary>
    /// IEnumerable接口的扩展方法,支持它的实现类是List的情况
    /// </summary>
    public static class IEnumerableExtensions
    {
        /// <summary>
        /// 向集合中添加元素
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="collection"></param>
        /// <param name="value"></param>
        public static void Add<T>(this IEnumerable<T> collection, T value)
        {
            (collection as List<T>).Add(value);
        }
        /// <summary>
        /// 从集合中删除元素
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="collection"></param>
        /// <param name="value"></param>
        public static void Remove<T>(this IEnumerable<T> collection, T value)
        {
            (collection as List<T>).Remove(value);
        }
        /// <summary>
        /// 检索集合中是否包含某个元素
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="collection"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public static bool Contains<T>(this IEnumerable<T> collection, T value)
        {
            return (collection as List<T>).Contains(value);
        }
    }

调用也是十分简单,和List类型的一样样,呵呵,舒服!

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" alt="" />

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    网友 2014/12/23 14:00:20 发表

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