036. asp.netWeb用户控件之五使用用户控件实现分页数据导航

UserDataPager.ascx用户控件代码:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="UserDataPager.ascx.cs" Inherits="UserDataPager" %>
<style type="text/css">
    .style8
    {
    }
    .style11
    {
        width: 249px;
        font-size: small;
    }
    </style>
<table cellpadding="0" cellspacing="0" 
    
    style="border: 1px solid #999999; font-size: small; height: 25px;  403px;" 
    bgcolor="#F2F2F2">
    <tr>
        <td style="text-align: center" class="style11">
            共有数据<asp:Label ID="lbldatanum" runat="server" ForeColor="Red"></asp:Label>
            条&nbsp; 每页<asp:Label ID="lblnum" runat="server" ForeColor="Red"></asp:Label>
            条&nbsp; 第<asp:Label ID="lblCurrentPage" runat="server" ForeColor="Red"></asp:Label>
            页/共<asp:Label ID="lblcount" runat="server" Font-Size="9pt" ForeColor="Red"></asp:Label>
            页</td>
        <td style="text-align: center" class="style8">
            <asp:LinkButton ID="lbtnFirst" runat="server" Font-Size="9pt" 
                onclick="lbtnFirst_Click" Enabled="False">|&lt;</asp:LinkButton>
        &nbsp;<asp:LinkButton ID="lbtnForward" runat="server" Font-Size="9pt" 
                onclick="lbtnForward_Click" Enabled="False">&lt;</asp:LinkButton>
        &nbsp;<asp:LinkButton ID="lbtnBackwards" runat="server" Font-Size="9pt" 
                onclick="lbtnBackwards_Click">&gt;</asp:LinkButton>
        &nbsp;<asp:LinkButton ID="lbtnLast" runat="server" Font-Size="9pt" 
                onclick="lbtnLast_Click">&gt;|</asp:LinkButton>
        </td>
    </tr>
</table>

UserDataPager.ascx.cs代码:

public partial class UserDataPager : System.Web.UI.UserControl
{
    protected static PagedDataSource pds = new PagedDataSource();//创建一个分页数据源的对象且一定要声明为静态
    private SqlConnection conn;

    private object operateID;
    public object OperateID
    {
        get { return operateID; }
        set { operateID = value; }
    }
    private int pageNum=5;
    public int PageNum
    {
        get { return pageNum; }
        set { pageNum = value; }
    }
    private string strSQL = "";
    public string StrSQL
    {
        get { return strSQL; }
        set { strSQL = value; }
    }
    private string sql = "";
    public string DataSQL
    {
        get { return sql; }
        set { sql = value; }
    }

    private void BindDataList(int currentpage)
    {
        string mytype = operateID.GetType().ToString();
        mytype = mytype.Substring(mytype.LastIndexOf(".") + 1, mytype.Length - 1 - mytype.LastIndexOf("."));
        conn = new SqlConnection(strSQL);
        pds.AllowPaging = true;//允许分页
        pds.PageSize = pageNum;//每页显示3条数据
        pds.CurrentPageIndex = currentpage;//当前页为传入的一个int型值
        conn.Open();//打开数据库连接 
        SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
        DataSet ds = new DataSet();
        sda.Fill(ds);//把执行得到的数据放在数据集中
        pds.DataSource = ds.Tables[0].DefaultView;//把数据集中的数据放入分页数据源中
        lblcount.Text = pds.PageCount.ToString();
        lblCurrentPage.Text =(pds.CurrentPageIndex + 1).ToString();
        lblnum.Text = pageNum.ToString();
        lbldatanum.Text = ds.Tables[0].Rows.Count.ToString();
        if (pds.PageCount > 1)
        {
            lbtnBackwards.Enabled = true;
            lbtnLast.Enabled = true;
        }
        else
        {
            lbtnBackwards.Enabled = false;
            lbtnLast.Enabled = false;
        }
        if (mytype == "GridView")
        {
            ((GridView)(operateID)).DataSource = pds;
            ((GridView)(operateID)).DataBind();
        }
        else if (mytype == "DataList")
        {
            ((DataList)(operateID)).DataSource = pds;
            ((DataList)(operateID)).DataBind();
        }
        conn.Close();
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindDataList(0);
        }
    }
    protected void lbtnFirst_Click(object sender, EventArgs e)//首页
    {
        pds.CurrentPageIndex = 0;
        BindDataList(pds.CurrentPageIndex);
        lbtnFirst.Enabled = false;
        lbtnForward.Enabled = false;
        lbtnBackwards.Enabled = true;
        lbtnLast.Enabled = true;

    }
    protected void lbtnForward_Click(object sender, EventArgs e)//上一页
    {
        if (pds.CurrentPageIndex >= 0)
        {
            pds.CurrentPageIndex = pds.CurrentPageIndex - 1;
            BindDataList(pds.CurrentPageIndex);
            lbtnBackwards.Enabled = true;
            lbtnLast.Enabled = true;
            if (pds.CurrentPageIndex == 0)
            {
                lbtnForward.Enabled = false;
                lbtnFirst.Enabled = false;
            }
        }
    }
    protected void lbtnBackwards_Click(object sender, EventArgs e)//下一页
    {
        if (pds.CurrentPageIndex <= pds.PageCount - 1)
        {
            lbtnFirst.Enabled = true;
            lbtnForward.Enabled = true;
            pds.CurrentPageIndex = pds.CurrentPageIndex + 1;
            BindDataList(pds.CurrentPageIndex);
            if (pds.CurrentPageIndex == pds.PageCount - 1)
            {
                lbtnBackwards.Enabled = false;
                lbtnLast.Enabled = false;
            }
        }
    }
    protected void lbtnLast_Click(object sender, EventArgs e)//尾页
    {
        pds.CurrentPageIndex = pds.PageCount - 1;
        BindDataList(pds.CurrentPageIndex);
        lbtnLast.Enabled = false;
        lbtnBackwards.Enabled = false;

        lbtnFirst.Enabled = true;
        lbtnForward.Enabled = true;
    }
}

Default.aspx代码:

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register src="UserDataPager.ascx" tagname="UserDataPager" tagprefix="uc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>无标题页</title>
    <style type="text/css">
        .style7
        {
            width: 100%;
            height: 42px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div style=" 1019px; text-align: center; height: 54px;">
    
        <table align="center" cellpadding="0" cellspacing="0" class="style7">
            <tr>
                <td style="text-align: left">
                    <uc1:UserDataPager ID="UserDataPager1" runat="server" />
                </td>
            </tr>
            <tr>
                <td>
                    </td>
            </tr>
        </table>
    
    </div>
    <asp:GridView ID="GridView1" runat="server" BackColor="White" 
        BorderColor="#CCCCCC" BorderStyle="Ridge" BorderWidth="1px" 
        CellPadding="3" Width="403px">
        <RowStyle ForeColor="#000066" />
        <FooterStyle BackColor="White" ForeColor="#000066" />
        <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
        <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
    </asp:GridView>
    </form>
</body>
</html>

Default.aspx.cs代码:

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        UserDataPager1.OperateID = GridView1; //设置针对哪个控件进行分页描述
        UserDataPager1.StrSQL = "server=.;uid=sa;pwd=123.456;database=TYW;";//设置链接字符串
        UserDataPager1.DataSQL = "select * from card";
        UserDataPager1.PageNum = 6;
    }
}

最终效果: