EF/SQL/新闻中分页应用 Alec

1、EF分页

public IList<V_Test> GetTestPageLoad(int pagesize, int pageindex, out int total)
        {
            try
            {
                TestOnLineEntities db = new TestOnLineEntities();

                var testlist = from vtest in db.V_Test
                               orderby vtest.TestTime descending
                               select vtest;
                var result = testlist.ToList();               
                total = ViewTest.Count;
                //跳过的总条数
                int totalNum = (pageindex - 1) * pagesize;
                ViewTest = ViewTest.Skip(totalNum).ToList();
                if (ViewTest.Count > pagesize)
                {
                    ViewTest.RemoveRange(pagesize, total - pagesize);
                }
                return ViewTest;
            }
            catch (Exception)
            {
                total = 0;
                return null;
            }
        }

2、SQL语句分页

 /// <summary>
        /// 显示分页信息
        /// </summary>
        /// <param name="totleCount">总条数</param>
        /// <param name="pageNum">请求的是第几页</param>
        /// <param name="pageSize">每页显示条数</param>
        /// <param name="strType">信息类型</param>
        /// <returns></returns>
        public static DataSet PageListArticle(out int totleCount, int pageNum, int pageSize,string strType)
        {
            try
            {
                //sql语句实现分页功能
                string sqlstr = "select top " + pageSize + " * from Article" +
                                 "where (Article.type=" + strType + " and Article.articleId>(" +
                                 "select MAX(articleId) " +
                                 " from (select TOP " + pageSize * (pageNum - 1) + " articleId " +
                                 "from Article" +
                                 "order by articleId) as articleId ))" +
                                 "order by Article.articleId";
                DataSet result = db.GetTableBySql(sqlstr);
                //获取总记录数目
                totleCount = result.Tables[0].Rows.Count;
                if (result != null)
                    return result;
                else
                    return null;
            }
            catch (Exception)
            {
                totleCount = 0;
                return null;
            }
        }

3、新闻内容分页

思路：在新闻编辑时，在需要分页的地方插入分页符（如“【分页符】”），显示时，根据分页符的位置进行分页。

using System.Text;
//为内容生成分页
        public static string ContentPage(string content, int page)
        {
            string[] array_content = content.Split(new string[] { "【分页符】" }, StringSplitOptions.None);
            int length = array_content.Length;
            if (length <= 1)
            {
                return content;
            }
            return array_content[page - 1] + MakePage(length, page);
        }
        public static string MakePage(int length, int page)
        {
            string url;
            int ic = HttpContext.Current.Request.RawUrl.IndexOf("&page");
            if (ic > 0)
            {
                url = HttpContext.Current.Request.RawUrl.Remove(ic);
            }
            else
            {
                url = HttpContext.Current.Request.RawUrl;
            }
            StringBuilder builder = new StringBuilder();
            builder.Append("<center><table id=\"pagelist\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"text-decoration:none;\" align=\"center\" width=\"auto\">");
            builder.Append("<tr><td align=\"center\"><ul><li style=\"list-style-type:none;float:left;margin-left:5px;\"
><a href=\"" + url + "\">首页</a></li><li style=\"list-style-type:none;float:left;margin-left:5px;\"
><a href=\"" + url + "&page=" + (page - 1).ToString() + "\">上一页</a></li>");
            for (int i = 0; i < length; i++)
            {
                if (page - 1 == i)
                {
                    builder.Append("<li class=\"current\" style=\"list-style-type:none;float:left;margin-left:5px;\"
>" + (i + 1).ToString() + "</li>");
                }
                else
                {
                    builder.Append("<li style=\"list-style-type:none;float:left;margin-left:5px;\"
><a href=\"" + url + "&page=" + (i + 1).ToString() + "\">" + (i + 1).ToString() + "</a></li>");
                }
            }
            if (page < length)
            {
                builder.Append("<li style=\"list-style-type:none;float:left;margin-left:5px;\"
><a href=\"" + url + "&page=" + (page + 1).ToString() + "\">下一页</a></li>");
            }
            else
            {
                builder.Append("<li style=\"list-style-type:none;float:left;margin-left:5px;\"
><a href=\"" + url + "&page=" + page.ToString() + "\">下一页</a></li>");
            }
            builder.Append("<li style=\"list-style-type:none;float:left;margin-left:5px;\"
><a href=\"" + url + "&page=" + length.ToString() + "\">尾页</a></li></ul></td></tr></table></center>");            
            return builder.ToString();
        }

如图：