ADO.NET Entity Framework 批量更新/批量删除扩展

        一直都在想着用ADO.NET Entity Framework开发项目，只是Entity Framework 中不能同时更新多条记录。所以一直没有使作其开发。最近在看到了一些LINQ TO SQL的一些扩展方法，本人就LINQ TO SQL的扩展也实行了对Entity Framework扩展。主要代码如下：

       以下是更新的扩展代码：

　　 

        /// <summary>

        /// 更新满足条件的实体，返回更新实体的条数

         /// </summary>

        /// <typeparam name="T">更新的类型</typeparam>

        /// <param name="Entity">实体类</param>

        /// <param name="Predicate">更新的条件</param>

        /// <param name="Updater">更新的值</param>

        /// <returns>int</returns>

        public static int UpdateEntity<T>(this ObjectSet<T> Entity, Expression<Func<T, bool>> Predicate, Expression<Func<T, T>> Updater) where T : class

        {

            ConditionBuilder Builder = new ConditionBuilder();

            Builder.Build(Predicate.Body);

            string sqlCondition = Builder.Condition;

            //获取Update的赋值语句

            var updateMemberExpr = (MemberInitExpression)Updater.Body;

            var updateMemberCollection = updateMemberExpr.Bindings.Cast<MemberAssignment>().Select(c => new

            {

                Name = c.Member.Name,

                Value = ((ConstantExpression)c.Expression).Value

            });

            int i = Builder.Arguments.Length;

            string sqlUpdateBlock = string.Join(", ", updateMemberCollection.Select(c => string.Format("[{0}]={1}", c.Name, "{" + (i++) + "}")).ToArray());

            string commandText = string.Format("Update {0} Set {1} Where {2}", Entity.EntitySet.Name, sqlUpdateBlock, sqlCondition);

            //获取SQL参数数组 (包括查询参数和赋值参数)

            var args = Builder.Arguments.Union(updateMemberCollection.Select(c => c.Value)).ToArray();

            var Result = Entity.Context.ExecuteStoreCommand(commandText, args);

            return Result;

        }

 

  　　以下是删除方法的扩展：

　　       /// <summary>

         /// 删除满足条件的实体，返回删除实体的条数

          /// </summary>

        /// <typeparam name="T">删除的类型</typeparam>

        /// <param name="Entity">实体类</param>

        /// <param name="Predicate">删除的条件</param>

        /// <returns>int</returns>

        public static int DeleteEntity<T>(this ObjectSet<T> Entity, Expression<Func<T, bool>> Predicate) where T : class

        {

            //查询条件表达式转换成SQL的条件语句

            ConditionBuilder Builder = new ConditionBuilder();

            Builder.Build(Predicate.Body);

            string sqlCondition = Builder.Condition;

            //获取SQL参数数组 

            var args = Builder.Arguments;

            var Result = Entity.Context.ExecuteStoreCommand("Delete  From  " + Entity.EntitySet.Name + " Where " + sqlCondition, args);

            return Result;

        }

 

        批量更新/批量删除主要是通过拼接SQL语句执行。还需高手多多指点。点击此处下载源码