在Asp.net中自定义的分页控件

 

此分页控件是采用后台存储过程分页，每次只取一页的数据。当然，物不尽美，同样数据量很大的时候，也会增加数据库的负担，因每次翻页的时候，都要与数据库进行交互！
一、存储过程

CREATE        PROCEDURE   [ dbo ] . [ PageData_P ]  
@sqlstr   nvarchar ( 3500 ),      -- SQL字符串
@curpage   int ,         -- 第N页
@pagesize   int          -- 每页行数
AS
begin

set  nocount  on
declare   @P1   int ,         -- P1是游标的id
         @rowcount   int ,  @pagecount   int
SET   @sqlstr   =   RTRIM ( @sqlstr )
exec  sp_cursoropen  @P1  output, @sqlstr , @scrollopt = 1 , @ccopt = 1 , @rowcount = @rowcount  output
set   @pagecount   =   ceiling ( 1.0 * @rowcount / @pagesize )
if   @curpage <= 1
     set   @curpage   = 1
if   @curpage > @pagecount
     set   @curpage = @pagecount
select   @rowcount   as  Total,  @pagecount   as  PageCount, @curpage   as  CurPage    
set   @curpage = ( @curpage - 1 ) * @pagesize + 1
exec  sp_cursorfetch  @P1 , 16 , @curpage , @pagesize  
exec  sp_cursorclose  @P1
end
GO

二、在项目中新增一用户控件，命名为Pager.ascx
1、页面代码为： 

<% @ Control Language="c#" AutoEventWireup="false" Codebehind="Pager.ascx.cs" Inherits="IncludeLib.UserControl.Pager" TargetSchema="http://schemas.microsoft.com/intellisense/ie5"  %>
< asp:Table  width ="100%"  runat ="server"  id ="tblPager"  HorizontalAlign ="Center" >
     < asp:TableRow >
         < asp:TableCell  HorizontalAlign ="Center" >
             < asp:linkbutton  id ="btnFirst"  runat ="server"  CommandArgument ="fist"  Font-Size ="10" > 首页 </ asp:linkbutton > &nbsp; |
             < asp:linkbutton  id ="btnPrev"  runat ="server"  CommandArgument ="prev"  Font-Size ="10" >  
                          上一页 </ asp:linkbutton > &nbsp; |
             < asp:linkbutton  id ="btnNext"  runat ="server"  CommandArgument ="next"  Font-Size ="10" >  
                          下一页 </ asp:linkbutton > &nbsp; |
             < asp:linkbutton  id ="btnLast"  runat ="server"  CommandArgument ="last"  Font-Size ="10" >  
                          末页 </ asp:linkbutton > &nbsp; < FONT  size ="2" > 到第
                 < asp:textbox  id ="txtGoPage"  runat ="server"  MaxLength ="4"  AutoPostBack ="True"  Width ="36px" > 1 </ asp:textbox > 页 &nbsp;
             </ FONT >< FONT  size ="2" > 第
                 < asp:label  id ="lblCurrentIndex"  runat ="server" > 1 </ asp:label > 页/共
                 < asp:label  id ="lblPageCount"  runat ="server" > 0 </ asp:label > 页(
                 < asp:label  id ="lblRecordCount"  runat ="server" > 0 </ asp:label > )条 &nbsp; </ FONT >
         </ asp:TableCell >
     </ asp:TableRow >
</ asp:Table >

2、CS代码部分：

namespace  MyLibrary.UserControl
{
    using System;
    using System.Data;
    using System.Drawing;
    using System.Web;
    using System.Web.UI.WebControls;
    using System.Web.UI.HtmlControls;
    using System.ComponentModel;
    using System.Web.UI;
    using System.Collections;
    
    public class Pager : System.Web.UI.UserControl
    {
        变量定义#region 变量定义
        protected System.Web.UI.WebControls.LinkButton btnFirst;
        protected System.Web.UI.WebControls.LinkButton btnPrev;
        protected System.Web.UI.WebControls.LinkButton btnNext;
        protected System.Web.UI.WebControls.LinkButton btnLast;
        protected System.Web.UI.WebControls.TextBox txtGoPage;
        protected System.Web.UI.WebControls.Label lblCurrentIndex;
        protected System.Web.UI.WebControls.Label lblRecordCount;
        protected System.Web.UI.WebControls.Table tblPager;
        protected System.Web.UI.WebControls.Label lblPageCount;
        #endregion

        数据绑定事件#region 数据绑定事件
        //public delegate void DataListPageChangedEventHandler(object sender , DataGridPageChangedEventArgs e);
        /**//// <summary>
        /// 数据绑定事件
        /// </summary>
        public delegate void DataBindEventHandler();
        #endregion

        初始化网页#region 初始化网页
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在这里放置使用者程序代码以初始化网页
            if(!Page.IsPostBack)
            {
                txtGoPage.Attributes.Add("onclick", "this.select()");
                txtGoPage.Style.Add("text-align", "center");
            }
        }
        #endregion

        Web Form 设计工具产生的程序代码#region Web Form 设计工具产生的程序代码
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: 此为 ASP.NET Web Form 设计工具所需的调用。
            //
            this.PageIndexChanged+=new DataGridPageChangedEventHandler(OnPageIndexChanged);
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        ///        此为设计工具支持所必须的方法 - 请勿使用程序代码编辑器修改
        ///        这个方法的内容。
        /// </summary>
        private void InitializeComponent()
        {            
            this.Load += new System.EventHandler(this.Page_Load);
            this.btnFirst.Click +=new EventHandler(btnFirst_Click);
            this.btnLast.Click +=new EventHandler(btnLast_Click);
            this.btnNext.Click +=new EventHandler(btnNext_Click);
            this.btnPrev.Click +=new EventHandler(btnPrev_Click);
            this.txtGoPage.TextChanged +=new EventHandler(txtGoPage_TextChanged);

        }
        #endregion

        变量定义#region 变量定义
        /**//// <summary>
        /// 绑定数据
        /// </summary>
        public event DataBindEventHandler BindData;
        /**//// <summary>
        /// 换页事件
        /// </summary>
        private event DataGridPageChangedEventHandler PageIndexChanged;
        #endregion

        第一页#region 第一页
        private void btnFirst_Click(object sender, System.EventArgs e)
        {
            int intNewPage = 1;
            this.PageIndexChanged(this, new DataGridPageChangedEventArgs(sender, intNewPage));
        }
        #endregion

        前一页#region 前一页
        private void btnPrev_Click(object sender, System.EventArgs e)
        {
            int intNewPage = Convert.ToInt32(lblCurrentIndex.Text) - 1;
            this.PageIndexChanged(this, new DataGridPageChangedEventArgs(sender, intNewPage));
        }
        #endregion

        下一页#region 下一页
        private void btnNext_Click(object sender, System.EventArgs e)
        {
            int intNewPage = Convert.ToInt32(lblCurrentIndex.Text)  + 1;
            this.PageIndexChanged(this, new DataGridPageChangedEventArgs(sender, intNewPage));
        }
        #endregion

        最后一页#region 最后一页
        private void btnLast_Click(object sender, System.EventArgs e)
        {
            int intNewPage = Convert.ToInt32(lblPageCount.Text);
            this.PageIndexChanged(this, new DataGridPageChangedEventArgs(sender, intNewPage));
        }
        #endregion

        改变第几页的textbox值#region 改变第几页的textbox值
        private void txtGoPage_TextChanged(object sender, System.EventArgs e)
        {
            try
            {
                int intNewPage = Convert.ToInt32(txtGoPage.Text);
                this.PageIndexChanged(this, new DataGridPageChangedEventArgs(sender, intNewPage));
            }
            catch
            {
                int intNewPage = Convert.ToInt32(lblCurrentIndex.Text);
                this.PageIndexChanged(this, new DataGridPageChangedEventArgs(sender, intNewPage));
            }
        }
        #endregion

        设定link是否可以点选#region 设定link是否可以点选
        protected override void Render(System.Web.UI.HtmlTextWriter writer)
        {
            if(this.CurrentPageIndex<=1)
            {
                btnFirst.Enabled = false;
                btnPrev.Enabled  = false;
            }
            else
            {
                btnFirst.Enabled = true;
                btnPrev.Enabled  = true;
            }
            if(this.CurrentPageIndex>=this.PageCount)
            {
                btnNext.Enabled = false;
                btnLast.Enabled = false;
            }
            else
            {
                btnNext.Enabled = true;
                btnLast.Enabled = true;
            }
            if(this.PageCount<=1)
                txtGoPage.Enabled = false;
            else
                txtGoPage.Enabled = true;
            base.Render (writer);
        }
        #endregion

        取得或设定当前页#region 取得或设定当前页
        /**//// <summary>
        /// 取得或设定当前页
        /// </summary>
        [Category("其它"), Description("当前页"), Browsable(false), DefaultValue(1) ]
        public int CurrentPageIndex
        {
            get
            {
                return Convert.ToInt32(lblCurrentIndex.Text);
            }
            set
            {
                lblCurrentIndex.Text = value.ToString();
                txtGoPage.Text = lblCurrentIndex.Text;
            }
        }
        #endregion

        取得或设定总页数#region 取得或设定总页数
        /**//// <summary>
        /// 取得或设定总页数
        /// </summary>
        [Category(""), Description("总页数"), Browsable(false), DefaultValue(0) ]
        public int PageCount
        {
            get
            {
                return Convert.ToInt32(lblPageCount.Text);
            }
            set
            {
                lblPageCount.Text = value.ToString();
            }
        }
        #endregion

        取得或设定总记录数#region 取得或设定总记录数
        /**//// <summary>
        /// 取得或设定总记录数
        /// </summary>
        [Category("分页"), Description("总记录数"), Browsable(false), DefaultValue(0) ]
        public int RecordCount
        {
            get
            {
                return Convert.ToInt32(lblRecordCount.Text);
            }
            set
            {
                lblRecordCount.Text = value.ToString();
            }
        }
        #endregion

        改变页码#region 改变页码
        private void OnPageIndexChanged(object source, DataGridPageChangedEventArgs e)
        {
            this.CurrentPageIndex = e.NewPageIndex;
            this.BindData();
        }
        #endregion
    }
}

三、用法与事例

     使用说明--举例 #region 使用说明--举例
    /**//// <summary>
    ///        Pager 的摘要描述。
    ///        实现自定义分页,前端要实现BindData()事件
    /// </summary>
    /// <remarks>
    /// <pre>
    /// 例﹕
    /// aspx：(如果不需要显示分页控件，可以用<!--   //-->把分页控件注释起来
    ///<%@ Register TagPrefix="uc1" TagName="Pager" Src="../MyLibrary/UserControl/Pager.ascx" %>
    ///
    ///<form name="Form1" id="Form1" runat="server">
    ///<br>
    ///<div align="center">
    ///    <p><uc1:pager id="Pager1" runat="server"></uc1:pager></p>
    ///</div>
    ///</form> 以上部分可以把该控件直接拖到页面，自动生成
    /// cs:
    /// protected IncludeLib.UserControl.Pager Pager1;
    /// private void Page_Load(object sender, System.EventArgs e)
    /// {
    ///     // 在这里放置使用者程序代码以初始化网页
    ///     if (!IsPostBack)
    ///     {
    ///         BindData();
    ///     }
    ///     this.Pager1.BindData +=new IncludeLib.UserControl.Pager.DataBindEventHandler(this.BindData);
    /// }
    /// private void BindData()
    /// {
    ///        MAXFC.DataBase.DataConn dbConn=new MAXFC.DataBase.DataConn();
    ///        string strSql="SQL语句";
    ///        strSql="exec [P_PageData] '"+strSql+"','"+Pager1.CurrentPageIndex+"','10'";
    ///     DataSet ds = dbConn.GetDataSet(strSql);
    ///     DataList1.DataSource = ds.Tables[2].DefaultView;
    ///     DataList1.DataBind();
    ///     Pager1.CurrentPageIndex    = Convert.ToInt32(ds.Tables[1].Rows[0]["CurPage"]);
    ///     Pager1.PageCount        = Convert.ToInt32(ds.Tables[1].Rows[0]["PageCount"]);
    ///     Pager1.RecordCount        = Convert.ToInt32(ds.Tables[1].Rows[0]["Total"]);
    /// }
    ///     
    /// html分页：
    /// <%
    /// for(int i=0;ds!=null && i<ds.Tables[2].Rows.Count;i++)
    /// {
    /// %>
    /// <%=ds.Tables[2].Rows[i]["article_sender"].ToString()%>
    /// <%
    /// }
    /// %>
    /// 
    /// </pre>
    /// </remarks>
    /// 
    #endregion