DataList中分頁代碼（太久了 有點遺忘）

在頁面檔案的DataList中加入以下四個按鈕

<asp:linkbutton id='FirstLB' runat='server' OnCommand='LinkButton_Click' CommandName='f'>第一頁</asp:linkbutton>&nbsp;

            <asp:linkbutton id='PreviousLB' runat='server' OnCommand='LinkButton_Click' CommandName='p'>上一頁</asp:linkbutton>&nbsp;

            <asp:linkbutton id='NextLB' runat='server' OnCommand=LinkButton_Click CommandName='n'>下一頁</asp:linkbutton>&nbsp;

            <asp:linkbutton id='EndLB' runat='server' OnCommand=LinkButton_Click CommandName='e'>最後一頁</asp:linkbutton>

背景代碼：

先聲明幾個公共變量     int CurrentPage;//目前頁數 

    int PageSize;   //每頁條數 

    int PageCount;  //總頁數 

    int RecordCount;//總條數 

    int[] j=null; 

頁面加載的時候         string productIds = Request.Params["分頁的依據"]; 

        string[] productId = productIds.Split(','); 

        j = new int[productId.Length]; 

        for (int m = 0; m < productId.Length; m++) 

        { 

             j= Convert.ToInt32(productId);          }           PageSize = 10;//每頁10條記錄

        if (!Page.IsPostBack) 

        {             

             CurrentPage = 0;//目前頁習慣設為0 

            ViewState["PageIndex"] = 0;//頁索引也設為0 

            //計算總共有多少記錄 

            RecordCount = DAL.Counts(j); 

            //計算總共有多少頁 

            if (RecordCount % PageSize == 0) 

            { 

                PageCount = RecordCount / PageSize; 

            } 

            else 

            { 

                PageCount = RecordCount / PageSize + 1; 

            } 

            this.TotalLbl.Text = PageCount.ToString();//顯示總頁數 

            ViewState["PageCount"] = PageCount;//會話session 對整個 application 有效 ，而視圖狀态 viewstate相當于某個頁面的 session 

            this.DataListBind(j);//不可以放在初始化條件之前就綁定，那樣的話，如果僅有一頁的資料，“下一頁”頁仍然顯示 

           }     private void DataListBind(int[] j) 

    { 

        try 

        { 

            int StartIndex = CurrentPage * PageSize;//設定導入的起終位址 

            DataSet ds = DAL.SearchByID(j,StartIndex,PageSize,"内容"); 

            this.ListProduct.DataSource = ds.Tables[0].DefaultView; 

            this.ListProduct.DataBind(); 

            this.PreviousLB.Enabled = true; 

            this.NextLB.Enabled = true; 

            if (CurrentPage == (PageCount - 1)) this.NextLB.Enabled = false;//當為最後一頁時，下一頁連結按鈕不可用 

            if (CurrentPage == 0) this.PreviousLB.Enabled = false;//當為第一頁時，上一頁按鈕不可用 

            this.CurrentLbl.Text = (CurrentPage + 1).ToString();//目前頁數 

        } 

        catch (Exception ex) 

        { 

            throw new Exception(ex.Message); 

        } 

    } 

    public void LinkButton_Click(Object sender, CommandEventArgs e)//自己編寫的按鈕點選事件 

    { 

        CurrentPage = (int)ViewState["PageIndex"];//獲得目前頁索引 

        PageCount = (int)ViewState["PageCount"];//獲得總頁數 

        string cmd = e.CommandName; 

        //判斷cmd，以判定翻頁方向 

        switch (cmd) 

        { 

            case "p"://上一頁 

                if (CurrentPage > 0) CurrentPage--; 

                break; 

            case "n": 

                if (CurrentPage < (PageCount - 1)) CurrentPage++;//下一頁 

                break; 

            case "f"://第一頁 

                CurrentPage = 0; 

                break; 

            case "e"://最後一頁 

                CurrentPage = PageCount - 1; 

                break; 

            case "j"://跳轉到第幾頁 

                if (this.TextBox1.Text.Trim() == null || Int32.Parse(this.TextBox1.Text.Trim()) > PageCount)//如果輸入數字為空或超出範圍則傳回 

                { 

                    return; 

                } 

                else 

                {                     

                    CurrentPage = Int32.Parse(this.TextBox1.Text.ToString()) - 1; 

                    break; 

                } 

        } 

        ViewState["PageIndex"] = CurrentPage;//獲得目前頁 

        this.DataListBind(j);//重新将DataList綁定到資料庫 

} 

}