ASP.NET中刷新分页

1，第一次全部把数据加载到内存中，然后再做分页，性能差，不推荐。

2，GridView自带分页

3，AspNetPager分页控件  这个是第三分控件需要下载，很好用

4，自己写分页

前三种就不介绍如何写了，网上很多，今天就来记录一下自己写的分页，不需要下载任何东西，全部都是代码完成。

原理则是通过URL来传递参数（第几页，每个多少个，总记录数等），最终生成这样的，每个都是一个超链接，只是传的当前页的参数不同

我们的前台

  <form id="form1" runat="server">
        <div>
          //数据显示
            <asp:Repeater ID="rpTest" runat="server">
                <HeaderTemplate>
                    <table style="width:80%">
                        <tr>
                            <th style="width:20%">产品名</th>
                            <th style="width:20%">单价</th>
                            <th style="width:20%">分类ID</th>
                            <th style="width:20%">你猜猜</th>
                        </tr>
                </HeaderTemplate>
                <ItemTemplate>
                    <tr>
                        <td><%#Eval("[ProductName]") %></td>
                        <td><%#Eval("[UnitPrice]") %></td>
                        <td><%#Eval("[CategoryID]") %></td>
                        <td><%#Eval("[QuantityPerUnit]") %></td>
                    </tr>

                </ItemTemplate>
              <FooterTemplate>
                   </table>
              </FooterTemplate>
            </asp:Repeater>

        </div>
        <br />
    
         //分页
        <div class="page">
            <div class="details">
                <span>每页<font><%=PageSize %></font>条</span> <span>共<font><%=PageCount %></font>条记录</span>
            </div>
            <div id="PageContent" class="paging" runat="server">
            </div>

<script>
              function Jump() {     //跳转方法       
                 window.location.href = "FenYeDemoOne.aspx?PageIndex=" + $("#textPage").val();
                }
         </script>

结构我们准备好了，然后把我们的样式给进来

/* 分页 --------------- */
.page{ width:%; float:left; margin:-1px   ; background:#C9E4FF;}
.details{ height:26px; float:left; padding:16px  16px 16px;}
.details span{ height:26px; line-height:26px; float:left; padding: 5px  ;}
.details span font{ padding: 5px;}
.paging{ height:26px; float:right; padding:16px 16px 16px ;}
.paging a{ height:26px; float:left; line-height:26px; padding: 9px; margin:   6px; background:#FFF; border-radius:2px;}
.paging span{ height:26px; float:left; line-height:26px; padding: 10px; margin:   6px;}
.paging span.opt{ background:#009EFF; color:#FFF;}
.paging a:hover{ text-decoration:none;}
.paging input{ width:58px; height:26px; float:left; margin:   6px; text-align:center;/* border:1px solid #D2D7DD; border-right:0px;*/}
.paging a.res{ height:26px; float:left; color:#FFF; line-height:26px; margin:0px; border:0px; background:#009EFF; border-radius: 2px 2px ;}
.paging a.res:hover{background:#00B6EC;}
.paging span.cpb{ background:#009EFF; color:#FFF;}
.paging span.disabled, .paging span.disabled{ height:26px; float:left; line-height:26px; padding: 9px; margin:   6px; background:#FFF;}

前台我们准备好了，我们来看后台，后台才是我们的主要

  public int PageSize = ; //每页显示多少条数据
    public int PageIndex  //当前页
    {
        get
        {
            object obj = ViewState["PageIndex"];
            return obj == null ?  : Convert.ToInt32(obj);
        }
        set
        {
            ViewState["PageIndex"] = value;
        }
    }

    public int PageCount   //总记录数
    {
        get
        {
            object obj = ViewState["PageCount"];
            return obj == null ?  : Convert.ToInt32(obj);
        }
        set
        {
            ViewState["PageCount"] = value;
        }
    }

    public int TotalPage   //总页数
    {
        get
        {
            object obj = ViewState["TotalPage"];
            return obj == null ?  : Convert.ToInt32(obj);
        }
        set
        {
            ViewState["TotalPage"] = value;
        }
    }
   

以上都基本会有

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //点的是第几页
            PageIndex = Request.QueryString["PageIndex"] == null ?  : Convert.ToInt32(Request.QueryString["PageIndex"].ToString());
            BingData(); //绑定数据
        }
    }

    void BingData() {

        //string textPage = hfPage.Value;  跳转的值
        //总记录数
        PageCount = Convert.ToInt32(SQLDB.SqlHelper.ExecuteScalar(conn, "select count(*) from Products"));

        //计算总页数
        if (PageCount % PageSize == )
        {
            TotalPage = PageCount / PageSize;
        }
        else
        {
            TotalPage = (PageCount / PageSize) + ;
        }
        //这里可以的话做个判断，跳转的时候如果输入大于最大的值就取最大值，小于最小值就取最小值
        //if (!string.IsNullOrEmpty(textPage))
        //{
        //    PageIndex = Convert.ToInt32(textPage);

        //    if (Convert.ToInt32(textPage) > TotalPage)
        //    {
        //        PageIndex = TotalPage == 0 ? 1 : TotalPage;
        //    }
        //    if (Convert.ToInt32(textPage) <= 0)
        //    {
        //        PageIndex = 1;
        //    }
        //}

        //SQL语句
       string sql = "select top "+PageSize+"* from Products where ProductID not in (select  top " + PageSize * (PageIndex - ) + " ProductID from Products)";
       rpTest.DataSource=SQLDB.SqlHelper.ExecuteDataSet(conn, sql); //数据源
       rpTest.DataBind();
       string pageUrl = Utils.CombUrlTxt("FenYeDemoOne.aspx", "PageIndex={0}",
               "__PageIndex__");//传过去的url，例如：XX.aspx?X=A&Y=B&Z=C....
       PageContent.InnerHtml = Utils.OutPageList(this.PageSize, this.PageIndex, this.PageCount, pageUrl, ); //分页方法,最后一个参数书店是中间显示多少个
    }

后台主要是Utils里面的两个方法

/// <summary>
        /// 组合URL参数
        /// </summary>
        /// <param name="_url">页面地址</param>
        /// <param name="_keys">参数名称</param>
        /// <param name="_values">参数值</param>
        /// <returns>String</returns>
        public static string CombUrlTxt(string _url, string _keys, params string[] _values)
        {
            StringBuilder urlParams = new StringBuilder();
            try
            {
                string[] keyArr = _keys.Split(new char[] { '&' });
                for (int i = ; i < keyArr.Length; i++)
                {
                    if (!string.IsNullOrEmpty(_values[i]) && _values[i] != "")
                    {
                        _values[i] = UrlEncode(_values[i]);
                        urlParams.Append(string.Format(keyArr[i], _values) + "&");
                    }
                }
                if (!string.IsNullOrEmpty(urlParams.ToString()) && _url.IndexOf("?") == -)
                    urlParams.Insert(, "?");
            }
            catch
            {
                return _url;
            }
            return _url + DelLastChar(urlParams.ToString(), "&");   //FenYeDemoOne.aspx？PageIndex=__PageIndex__

}

  /// <summary>
        /// URL字符编码
        /// </summary>
        public static string UrlEncode(string str)
        {
            if (string.IsNullOrEmpty(str))
            {
                return "";
            }
            str = str.Replace("'", "");
            return HttpContext.Current.Server.UrlEncode(str);
        }

  /// <summary>
        /// 删除最后结尾的指定字符后的字符
        /// </summary>
        public static string DelLastChar(string str, string strchar)
        {
            if (string.IsNullOrEmpty(str))
                return "";
            if (str.LastIndexOf(strchar) >=  && str.LastIndexOf(strchar) == str.Length - )
            {
                return str.Substring(, str.LastIndexOf(strchar));
            }
            return str;
        }

url里面的参数我们拼接好了

    /// <summary>
        /// 返回分页页码
        /// </summary>
        /// <param name="pageSize">页面大小</param>
        /// <param name="pageIndex">当前页</param>
        /// <param name="totalCount">总记录数</param>
        /// <param name="linkUrl">链接地址，__id__代表页码</param>
        /// <param name="centSize">中间页码数量</param>
        /// <returns></returns>
        public static string OutPageList(int pageSize, int pageIndex, int totalCount, string linkUrl, int centSize)
        {
            //计算页数
            if (totalCount <  || pageSize < )
            {
                return "";
            }
            int pageCount = totalCount / pageSize;
            //if (pageCount < 1)
            //{
            //    return "";
            //}
            if (totalCount % pageSize > )
            {
                pageCount += ;
            }
            if (pageCount < )
            {
                return "";
            }
            StringBuilder pageStr = new StringBuilder();
            string pageId = "__PageIndex__";
            string firstBtn = "<a href=\"" + ReplaceStr(linkUrl, pageId, (pageIndex - ).ToString()) + "\">«上一页</a>";
            string lastBtn = "<a href=\"" + ReplaceStr(linkUrl, pageId, (pageIndex + ).ToString()) + "\">下一页»</a>";
            string firstStr = "<a href=\"" + ReplaceStr(linkUrl, pageId, "") + "\">1</a>";
            string lastStr = "<a href=\"" + ReplaceStr(linkUrl, pageId, pageCount.ToString()) + "\">" + pageCount.ToString() + "</a>";

            string textPage = "<input id=\"textPage\"  value=\"" + pageIndex + "\" type=\"text\">";
            string JumpPage = "<a class=\"res\" href=\"javascript:Jump();\">跳转</a>";

            if (pageIndex <= )
            {
                firstBtn = "<span class=\"disabled\">«上一页</span>";
            }
            if (pageIndex >= pageCount)
            {
                lastBtn = "<span class=\"disabled\">下一页»</span>";
            }
            if (pageIndex == )
            {
                firstStr = "<span class=\"cpb\">1</span>";
            }
            if (pageIndex == pageCount && pageCount > )
            {
                lastStr = "<span class=\"cpb\">" + pageCount.ToString() + "</span>";
            }
            else if (pageCount == )
            {
                lastStr = "";
            }
            int firstNum = pageIndex - (centSize / ); //中间开始的页码
            if (pageIndex < centSize)
                firstNum = ;
            int lastNum = pageIndex + centSize - ((centSize / ) + ); //中间结束的页码
            if (lastNum >= pageCount)
                lastNum = pageCount - ;
            pageStr.Append(firstBtn + firstStr);
            if (pageIndex >= centSize)
            {
                pageStr.Append("<span>...</span>\n");
            }
            for (int i = firstNum; i <= lastNum; i++)
            {
                if (i == pageIndex)
                {
                    pageStr.Append("<span class=\"cpb\">" + i + "</span>");
                }
                else
                {
                    pageStr.Append("<a href=\"" + ReplaceStr(linkUrl, pageId, i.ToString()) + "\">" + i + "</a>");
                }
            }
            if (pageCount - pageIndex > centSize - ((centSize / )))
            {
                pageStr.Append("<span>...</span>");
            }
            pageStr.Append(lastStr + lastBtn);
            pageStr.Append(textPage);
            pageStr.Append(JumpPage);
            return pageStr.ToString();
        }

   /// <summary>
        /// 替换指定的字符串
        /// </summary>
        /// <param name="originalStr">原字符串</param>
        /// <param name="oldStr">旧字符串</param>
        /// <param name="newStr">新字符串</param>
        /// <returns></returns>
        public static string ReplaceStr(string originalStr, string oldStr, string newStr)
        {
            if (string.IsNullOrEmpty(oldStr))
            {
                return "";
            }
            return originalStr.Replace(oldStr, newStr);
        }

显示效果

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到此我们手动分页已完成，这样页面是会刷新的，下篇无刷新分页————》自定义ASP.NET中无刷新分页