用户自定义分页——PageNavigato

来源：互联网发布：帝力于我何有哉知乎编辑：程序博客网时间：2024/05/16 02:10

在程序当中遇到了一个分页功能，这个看起来挺简单的，但是在这个程序中他是由自己写的。对于分页我们并不陌生，当初在学习牛腩新闻发布系统的时候，到了最后牛腩老师给我们留了一个可以算是作业——分页。分页当时他提出来的应该是使用空间来进行分页，当然在后边我们学习的ASP.Net的时候也有降到分页技术。

在这里就和大家分享一下用户自定义的分页是如何使用的。比如在ProductList页面中使用到了此控件。

一、用户自定义控件的代码：

前台：

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="PageNavigator.ascx.cs" Inherits="YXShopAdmin.Admin.Control.PageNavigator" %>共<asp:Label runat="server" ID="LblRecordCount"/>条记录,共<asp:Label runat="server" ID="LblPageCount"/>页,当前第<asp:Label runat="server" ID="LblPageIndex" />页 <asp:LinkButton ID="LnkBtnFirst" runat="server" CommandName="Page" OnClick="LnkBtnFirst_Click" CssClass="list_link">首页</asp:LinkButton>   <asp:LinkButton ID="LnkBtnPrevious" runat="server" CommandName="Page" OnClick="LnkBtnPrevious_Click" CssClass="list_link">上一页</asp:LinkButton>  <asp:LinkButton ID="LnkBtnNext" runat="server" CommandName="Page" OnClick="LnkBtnNext_Click" CssClass="list_link">下一页</asp:LinkButton>   <asp:LinkButton ID="LnkBtnLast" runat="server" CommandName="Page" OnClick="LnkBtnLast_Click" CssClass="list_link">尾页</asp:LinkButton> <asp:textbox id="txtNewPageIndex" runat="server" width="20px" CssClass="form"/><asp:linkbutton id="LnkBtnGoto" runat="server" causesvalidation="False" commandargument="-1" commandname="Page" text="转到此页" OnClick="LnkBtnGoto_Click" CssClass="list_link" />

后台：

 public delegate void PageChangeHandler(object send, int nPageIndex);    public partial class PageNavigator : System.Web.UI.UserControl    {        public event PageChangeHandler OnPageChange;        private int _PageCount = 0;        private int _RecordCount = 0;        private int _PageIndex = 1;        protected void Page_Load(object sender, EventArgs e)        {        }        public int PageCount        {            get            {                return int.Parse(this.LblPageCount.Text);            }            set            {                _PageCount = value;                /*                if (_PageCount < 2)                {                    //this.txtNewPageIndex.Enabled = false;                    //this.LnkBtnGoto.Enabled = false;                }                else                {                    //this.txtNewPageIndex.Enabled = true;                    //this.LnkBtnGoto.Enabled = true;                }                 */                this.LblPageCount.Text = _PageCount.ToString();            }        }        public int RecordCount        {            get            {                return int.Parse(this.LblRecordCount.Text);            }            set            {                _RecordCount = value;                this.LblRecordCount.Text = _RecordCount.ToString();            }        }        public int PageIndex        {            get            {                return int.Parse(this.LblPageIndex.Text);            }            set            {                _PageIndex = value;                this.txtNewPageIndex.Text = this.LblPageIndex.Text = _PageIndex.ToString();                if (_PageIndex < 2)                {                    this.LnkBtnFirst.Enabled = false;                    this.LnkBtnPrevious.Enabled = false;                }                else                {                    this.LnkBtnFirst.Enabled = true;                    this.LnkBtnPrevious.Enabled = true;                }                if (_PageIndex >= _PageCount)                {                    this.LnkBtnNext.Enabled = false;                    this.LnkBtnLast.Enabled = false;                }                else                {                    this.LnkBtnNext.Enabled = true;                    this.LnkBtnLast.Enabled = true;                }            }        }        protected void LnkBtnFirst_Click(object sender, EventArgs e)        {            try            {                OnPageChange(sender, 1);            }            catch { }        }        protected void LnkBtnPrevious_Click(object sender, EventArgs e)        {            try            {                int n = Convert.ToInt32(this.LblPageIndex.Text);                n--;                OnPageChange(sender, n);            }            catch            {                throw;            }        }        protected void LnkBtnNext_Click(object sender, EventArgs e)        {                          int n = Convert.ToInt32(this.LblPageIndex.Text);                n++;                OnPageChange(sender, n);                    }        protected void LnkBtnLast_Click(object sender, EventArgs e)        {            try            {                int n = Convert.ToInt32(this.LblPageCount.Text);                OnPageChange(sender, n);            }            catch            {                throw;            }        }        protected void LnkBtnGoto_Click(object sender, EventArgs e)        {            int n;            try            {                n = Convert.ToInt32(this.txtNewPageIndex.Text);            }            catch            {                n = Convert.ToInt32(this.LblPageIndex.Text);            }            int np = Convert.ToInt32(this.LblPageCount.Text.Trim());            if (n > np)                n = np;            if (n < 1)                n = 1;            OnPageChange(sender, n);        }    }

二、前台（productList）使用：

引入控件：

<%@ Register Src="~/Saler/Admin/Control/PageNavigator.ascx" TagName="PageNavigator" TagPrefix="uc1" %>

调用：

<td><uc1:PageNavigator ID="PageNavigator1" runat="server" /></td>

后台控制：

protected void Page_Load(object sender, EventArgs e) {    this.PageNavigator1.OnPageChange += new PageChangeHandler(PageNavigator1_PageChange);}

 //获得列表        protected void PageNavigator1_PageChange(object sender, int PageIndex)        {            StartLoad(PageIndex);        }        protected void StartLoad(int PageIndex)        {            int i = 0;            int j = 0;            //因为登陆页面上的需要MemberID，但是自己的登陆页面没有写，所以这里就处错误了            if (Session["MemberID"].ToString() == null)            {                Response.Redirect("../../Login.aspx");                return;            }            List<YXShop.Model.Product> data = BLL.GetListByColumn("*", "Pro_PutoutID=" + Session["MemberID"] + " and Pro_PutoutTypeId=1 ", PageIndex, 15, out i, out j);            this.PageNavigator1.PageCount = j;            this.PageNavigator1.PageIndex = PageIndex;            this.PageNavigator1.RecordCount = i;            Productlists.DataSource = data;                              //设置datalist数据源            Productlists.DataBind();                                   //绑定数据源        }

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三、效果：

以上的功能都可以实现。

现在把这种方法分享给大家的意图：这种做法维护起来好维护，扩展性好。实现起来也不麻烦。希望对大家有所帮助。

学习ing......

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