datalist分页（codebehind部分）

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2005-3-14文/佚名

using System;
using System.Collections;
using System.Configuration;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace cj168.Web
{
    /// <summary>
    /// Summary description for search.
    /// </summary>
    public class search : System.Web.UI.Page

    {
        protected System.Web.UI.WebControls.DataList datalistSearchResult;
        protected System.Web.UI.WebControls.Label lblTxtSearch;
        protected System.Web.UI.WebControls.Label lblRecordCount;
        protected System.Web.UI.WebControls.Label lblCurrentPage;
        protected System.Web.UI.WebControls.Label lblPageCount;
        protected System.Web.UI.WebControls.Label lblPageRange;

        protected System.Web.UI.WebControls.LinkButton lbnPrevPage;
        protected System.Web.UI.WebControls.LinkButton lbnNextPage;
        String txtSearch;
        int PageSize,RecordCount,PageCount,CurrentPage;


        public search()
        {
            Page.Init += new System.EventHandler(Page_Init);
        }

        private void Page_Load(object sender, System.EventArgs e)
        {
            // Put user code to initialize the page here
            txtSearch = Request.Params["txtSearch"];
            if (txtSearch != null )
            {txtSearch = txtSearch.Replace("'","");

            lblTxtSearch.Text = txtSearch;

            //设定PageSize
            PageSize = 10;

            //计算总共有多少记录
            RecordCount = CalculateRecord();
            lblRecordCount.Text = RecordCount.ToString();

            if(!Page.IsPostBack)

                {


                DoSearch();
                CurrentPage = 0;
                ViewState["PageIndex"] = 0;



                //计算总共有多少页
                PageCount = RecordCount/PageSize;
                if (RecordCount%PageSize > 0)
                    PageCount = PageCount + 1;
                lblPageCount.Text = PageCount.ToString();
                ViewState["PageCount"] = PageCount;


                }
            }



        }

        //计算总共有多少条记录
        public int CalculateRecord()
        {
            cj168.DataAccess.MagsDB DoSearch = new cj168.DataAccess.MagsDB();
            return DoSearch.GetSearchResultCount(txtSearch);

        }

        void DoSearch()
        {
            int StartIndex;
            int fromItem, toItem;

            //设定导入的起终地址
            StartIndex    = CurrentPage*PageSize;

            cj168.DataAccess.MagsDB DoSearch = new cj168.DataAccess.MagsDB();
            datalistSearchResult.DataSource = DoSearch.GetSearchResult(txtSearch,StartIndex, PageSize);
            datalistSearchResult.DataBind();

            lbnNextPage.Enabled = true;
            lbnPrevPage.Enabled = true;
            if(CurrentPage==(PageCount-1)) lbnNextPage.Enabled = false;
            if(CurrentPage==0) lbnPrevPage.Enabled = false;
            lblCurrentPage.Text = (CurrentPage+1).ToString();

            fromItem = StartIndex+1;
            toItem = StartIndex+PageSize;

            if (RecordCount < toItem)
                toItem = RecordCount;

            lblPageRange.Text = fromItem + "-" + toItem;

        }



        public void Page_OnClick(Object sender,CommandEventArgs e)
        {
            CurrentPage = (int)ViewState["PageIndex"];
            PageCount    = (int)ViewState["PageCount"];

            string cmd = e.CommandName;
            //判断cmd，以判定翻页方向
            switch(cmd)
            {
                case "next":
                    if(CurrentPage<(PageCount-1)) CurrentPage++;
                    break;
                case "prev":
                    if(CurrentPage>0) CurrentPage--;
                    break;
            }

            ViewState["PageIndex"] = CurrentPage;

            DoSearch();


        }



        private void Page_Init(object sender, EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
        }

        #region Web Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion
    }
}