sharepoint列表如何进行随机取几条记录？

sharepoint列表如何进行随机取记录？由于itemid是不连续。可能存在删除添加等操作导致

我们可以采用随机取第几条记录。把记录集合取出来。产生随机第几条数。这里关键是如何产生不重复的随机数

方法如下：

#region//获取随机数

        /// <summary>

        /// 获取随机数

        /// </summary>

        /// <param name="Number">随机个数</param>

        /// <param name="minNum">随机的最小数</param>

        /// <param name="maxNum">随机的最大数</param>

        /// <returns></returns>

        public static int[] GetRandomArray(int Number, int minNum, int maxNum)

        {

            int j;

            int[] b = new int[Number];

            Random r = new Random();

            for (j = 0; j < Number; j++)

            {

                int i = r.Next(minNum, maxNum + 1);

                int num = 0;

                for (int k = 0; k < j; k++)

                {

                    if (b[k] == i)

                    {

                        num = num + 1;

                    }

                }

                if (num == 0)

                {

                    b[j] = i;

                }

                else

                {

                    j = j - 1;

                }

            }

            return b;

        }

        #endregion

 

 

  //得到最大数

                    int maxRandom = list.Items.Count;

                    //最小1

                    int minRandom = 1;

                    //得到随机数组

                    int[] randArr = GetRandomArray(topNumber, minRandom, maxRandom);

                    //读取

                    SPQuery query = new SPQuery();

//过滤后的记录

                    SPListItemCollection listItemCollection = list.GetItems(query);

                    #region//如果有记录

                    if (listItemCollection !=null && listItemCollection.Count>0)

                    {

                        //foreach

                        //计数器

                        int i = 1;

                        //得到记录计数器

                        int j = 0;

                        foreach(SPListItem randItem in listItemCollection)

                        {

                            #region//若计数器在随机数组里头,如果存在

                            if (((IList)randArr).Contains(i))

                            {

                                //取记录

                                //******************读取id,工号,姓名，图片url,

                                EmployeeEntity randentity = new EmployeeEntity();

                                //

                                randentity.ItemID = randItem["ID"] == null ? string.Empty :

                                    randItem["ID"].ToString();

                                //工号

                                randentity.EmployeeNO = randItem["EmployeeNO"] == null ? string.Empty :

                                  randItem["EmployeeNO"].ToString();

                                //姓名

                                randentity.EmployeeName = randItem["EmployeeName"] == null ? string.Empty :

                                  randItem["EmployeeName"].ToString();

                                //*****************图片url

                                //

                                result.Add(randentity);

                                //计数器+1

                                j++;

                            }

                            //如果已经获取50张，则退出循环

                            if(j == topNumber)

                            {

                                break;

                            }

                            //计数器+1

                            i++;

                            #endregion

                        }

                    }

                    #endregion