Repeater绑定数据库，使用AspNetPager进行分页

　　分页是Web中经常遇到的功能，分页主要有真分页和假分页。

　　所谓真分页是指：每一页显示多少数据，就从数据库读多少数据；

　　假分页是指：一次性从数据库读取所有数据，然后再进行分页。

这两种分页方式区别在于从数据库读取信息的方式，真分页的效率高。假分页在首次页面加载的时候会比较慢（如果数据量较多）。

　　下面学习下使用AspNetPager进行真分页

1.前台编写Repeater所呈现的数据：

   <table width="" border="">
    <tr>
        <td class="tr1">
            <asp:Label Text="姓名" runat="server"></asp:Label>
        </td>
        <td class="tr2">
            <asp:Label Text="所在公司" runat="server"></asp:Label>
        </td>
        <td class="tr3">
            <asp:Label Text="注册ID" runat="server"></asp:Label>
        </td>
    </tr>
    </table>

    <asp:Repeater ID="Repeater1" runat="server">
    <ItemTemplate>
    <table border="" width="">
    <tr>
    <td class="tr1">
    <%#Eval("E_Id")%>
    </td>
    <td class="tr2">
    <%#Eval("C_Id") %>
    </td>
    <td class="tr3">
    <%#Eval("User_Id") %>
    </td>
    </tr>
    </table>
    </ItemTemplate>
    </asp:Repeater>                 

aspx

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" 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2.加入AspNetPager控件

    <webdiyer:AspNetPager ID="AspNetPager1" runat="server"
        AlwaysShow="true" //始终显示分页控件，即使至分成一页
        UrlPaging="true"    //通过URL传递分页信息
        NumericButtonTextFormatString="[{0}]" //索引格式
        ShowCustomInfoSection="Left"     //显示当前页和总页数信息，默认值不显示，为left则将显示在页索引前，为right则为页索引后
        ShowInputBox="Always"    //输入框
        TextAfterInputBox="页"    //输入框之后
        TextBeforeInputBox="跳转到第" >   //输入框之前
    </webdiyer:AspNetPager>        

3.后台分页及绑定数据

    protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindRepeater();
            }
        }

a.BindRepeater()函数，绑定数据库等操作

        public void BindRepeater()
        {
            this.AspNetPager1.PageSize = ;//分页大小
            int count = ;//当前页默认为1

            if (Request.QueryString["page"] != null)//如果当前页非空，则将URL中的page赋值为当前页的值
            {
                count = Convert.ToInt32(Request.QueryString["page"].ToString());//使用URL传递分页信息，（如果使用AspNetPager的PageChanged函数，会在函数中调用两次PageChanged函数，影响运行效率）
            }
                int num = (count - ) * this.AspNetPager1.PageSize;  //当前页减1，乘以每页显示数目，得到前几页的数据数量
                string sql = "select top " + this.AspNetPager1.PageSize + " * from Emp  where E_Id not in (" +
                    " select top " + num + " E_Id from Emp order by  E_Id  asc) order by E_Id asc";//自定义的SQL语句，查找当前页的数据
                int recordcount;
                DataSet ds = GetPage(sql, this.AspNetPager1.CurrentPageIndex, this.AspNetPager1.PageSize, out recordcount);
                this.AspNetPager1.RecordCount = recordcount;
                Repeater1.DataSource = ds;
                Repeater1.DataBind();
                AspNetPager1.CustomInfoHTML = "记录总数：<b>" + AspNetPager1.RecordCount.ToString() + "</b>";
                AspNetPager1.CustomInfoHTML += " 总页数：<b>" + AspNetPager1.PageCount.ToString() + "</b>";
                AspNetPager1.CustomInfoHTML += " 当前页：<font color=\"red\"><b>" + count + "</b></font>";

        }

b.GetPage函数，返回数据集

        /// <summary>
        /// 获得数据源
        /// </summary>
        /// <param name="sql">sql语句</param>
        /// <param name="currentPage">当前页</param>
        /// <param name="pagesize">分页大小</param>
        /// <param name="recordcount">总页数</param>
        /// <returns>DataSet</returns>
        public DataSet GetPage(string sql, int currentPage, int pagesize, out int recordcount)
        {
           // String strSql = "select * from Emp";
            SqlDataAdapter ada = new SqlDataAdapter(sql, GetConnection());
            DataSet ds = new DataSet();
            //int startRow = (currentPage - 1) * pagesize;
            //ada.Fill(ds, startRow, pagesize, "table");//对读取到的数据进行分页，假分页时可以这样操作
            ada.Fill(ds, "table"); //填充
            recordcount = GetPageRecord();//得到总页数
            return ds;
        }
       

c.GetPagRecord函数，获得总记录数

 /// <summary>
        /// 获得总记录数
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public int GetPageRecord()
        {
            String sql = "select count(*) from Emp";
            SqlCommand cmd = new SqlCommand(sql, GetConnection());
            cmd.Connection.Open();
            int recordcount = (int)cmd.ExecuteScalar();
            return recordcount;
        }

d.GetConnection，获得连接串

        public SqlConnection GetConnection()
        {
            SqlConnection conn = new SqlConnection("server=.;database=ComInfo;integrated security=true");
            return conn;
        }