Repeater自定义分页(1)

Repeater自定义分页，使用的存储过程如下

--取得总记录数
if exists(select 1 from sys.objects where name = 'GetProductsCount' and type = 'P')
 drop proc GetProductsCount
go
CREATE PROCEDURE GetProductsCount
as
 select count(*) from products
go
--使用row_number函数
--SQL Server 2005的新特性,它可以将记录根据一定的顺序排列,每条记录和一个等级相关 这个等级可以用来作为每条记录的row index.
if exists(select 1 from sys.objects where name = 'GetProductsByPage' and type = 'P')
 drop proc GetProductsByPage
go
CREATE PROCEDURE GetProductsByPage
 @PageNumber int,
 @PageSize int
AS
 select ProductID, ProductName, SupplierID, CategoryID, QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued
 from
 (select row_number() Over (order by productid) as row,ProductID, ProductName, SupplierID, CategoryID, QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued
 from products) as ProductsWithRowNumber
 where row between (@PageNumber - 1) * @PageSize + 1 and @PageNumber * @PageSize
go

--exec GetProductsByPage 1, 10
--exec GetProductsByPage 5, 10
页面代码如下:

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后台代码如下:

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.SqlClient;

public partial class RepeaterPaging : System.Web.UI.Page
{
    //每页显示的最多记录的条数
    private int pageSize = 10;
    //当前页号
    private int currentPageNumber;
    //显示数据的总条数
    private static int rowCount;
    //总页数
    private static int pageCount;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            SqlConnection cn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString);

            SqlCommand cmd = new SqlCommand("GetProductsCount", cn);
            cmd.CommandType = CommandType.StoredProcedure;
            cn.Open();
            rowCount = (int)cmd.ExecuteScalar();
            cn.Close();
            pageCount = (rowCount - 1) / pageSize + 1;
            currentPageNumber = 1;

            for (int i = 1; i <= pageCount; i++)
            {
                dropPage.Items.Add(new ListItem(i.ToString(), i.ToString()));
            }
            dropPage.SelectedValue = dropPage.Items.FindByValue(currentPageNumber.ToString()).Value;
            Query();
        }
    }

    protected void sdsProducts_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
    {
        sdsProducts.SelectParameters["PageNumber"].DefaultValue = currentPageNumber.ToString();
        sdsProducts.SelectParameters["PageSize"].DefaultValue = pageSize.ToString();
    }

    protected void sdsProducts_Selected(object sender, SqlDataSourceStatusEventArgs e)
    {
        lblMessage.Text = "共找到" + rowCount + "条记录, 当前第" + currentPageNumber + "/" + pageCount + "页";
    }

    protected void lbtnPage_Command(object sender, CommandEventArgs e)
    {
        switch (e.CommandName)
        {
            case "First":
                currentPageNumber = 1;
                break;
            case "Previous":
                currentPageNumber = (int)ViewState["currentPageNumber"] - 1 > 1 ? (int)ViewState["currentPageNumber"] - 1 : 1;
                break;
            case "Next":
                currentPageNumber = (int)ViewState["currentPageNumber"] + 1 < pageCount ? (int)ViewState["currentPageNumber"] + 1 : pageCount;
                break;
            case "Last":
                currentPageNumber = pageCount;
                break;
        }
        dropPage.SelectedValue = dropPage.Items.FindByValue(currentPageNumber.ToString()).Value;
        Query();
    }

    protected void dropPage_SelectedIndexChanged(object sender, EventArgs e)
    {
        currentPageNumber = int.Parse(dropPage.SelectedValue);
        Query();
    }

    private void Query()
    {
        ViewState["currentPageNumber"] = currentPageNumber;
        SetButton(currentPageNumber);
        sdsProducts.Select(DataSourceSelectArguments.Empty);
    }

    private void SetButton(int currentPageNumber)
    {
        lbtnFirst.Enabled = currentPageNumber != 1;
        lbtnPrevious.Enabled = currentPageNumber != 1;
        lbtnNext.Enabled = currentPageNumber != pageCount;
        lbtnLast.Enabled = currentPageNumber != pageCount;
    }
}
页面效果如下