[置顶]分页控件

大家应该都知道很多网页都用到了自定义控件，今天我们就来详细介绍一下这个自定义控件：

先看代码：

后台代码

using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using System.Data.SqlClient; namespace CommUC { public partial class PageApart : System.Web.UI.UserControl { #region 属性字段 private string table; /// <summary> /// 操作的表 /// </summary> public string Table { get { return table; } set { table = value; } } private string primaryKey = "id"; /// <summary> /// 主键字段名 /// </summary> public string PrimaryKey { get { return primaryKey; } set { primaryKey = value; } } private int listPages = 10; /// <summary> /// 下拉列表中显示的页数 /// </summary> public int ListPages { get { return listPages; } set { listPages = value; } } private int pageSize = 10; /// <summary> /// 分页页面的显示的记录数 /// </summary> public int PageSize { get { return pageSize; } set { pageSize = value; } } private string selectField = "*"; /// <summary> /// 要筛选的字段‘*’为所有 /// </summary> public string SelectField { get { return selectField; } set { selectField = value; } } /// <summary> /// 查找条件 /// </summary> public string Where { get { return ViewState["where"].ToString(); } set { ViewState["where"] = value; } } private string order = null; /// <summary> /// 排序字段 /// </summary> public string Order { get { return order; } set { order = value; } } private string cssClass; /// <summary> /// css 样式 /// </summary> public string CssClass { get { return cssClass; } set { cssClass = value; } } private int showPage = 1; /// <summary> /// 显示第几页 /// </summary> public int ShowPage { get { try { showPage = Convert.ToInt32(ddlList.SelectedValue); } catch { } return showPage; } set { showPage = value; GoPage(showPage); } } private object binder; /// <summary> /// 数据绑定对象 /// </summary> public object Binder { get { return binder; } set { binder = value; } } #endregion #region 初始化分页控件 /// <summary> /// 分页控件参数的指定 /// </summary> /// <param name="gv">指定要分页出来的数据 要绑定到哪个控件上，可以是GridView,repeater,datalist</param> /// <param name="tableName">指定要查找 的是数据库中的哪张表，可以用join连接多张表</param> /// <param name="primaryKey">指定表中的主键名</param> /// <param name="listPages">指定在下拉列表中显示出多少页来</param> /// <param name="pageSize">指定每页显示多少条记录</param> /// <param name="selectField">指定筛选的字段，*为所有字段，也可以指定如（"id,name,datatime");</param> /// <param name="where">指定查找的条件</param> /// <param name="order">指定查找出来的结果的排序方式</param> public void Inti(object gv, string tableName, string primaryKey, int listPages, int pageSize, string selectField, string where, string order) { this.binder = gv; this.table = tableName; this.primaryKey = primaryKey; this.listPages = listPages; this.pageSize = pageSize; this.selectField = selectField; if (!IsPostBack) { this.Where = where; } this.order = order; } #endregion #region 分页方法 private void ButtonsShow(bool tf) { if (cssClass != null) { lnkbtnOne.CssClass = cssClass; lnkbtnNext.CssClass = cssClass; lnkbtnUp.CssClass = cssClass; lnkbtnLast.CssClass = cssClass; } lnkbtnOne.Enabled = tf; lnkbtnNext.Enabled = tf; lnkbtnLast.Enabled = tf; lnkbtnUp.Enabled = tf; } private int pageCount; public int PageCount { get { return pageCount; } set { pageCount = value; } } private void GoPage(int pageNo) { try { ButtonsShow(true); string sql = "select count(*) from " + table + " where " + Where; int count = GetCount(sql) ;//总记录数 pageCount = count / pageSize + (count % pageSize == 0 ? 0 : 1);//总页数 lbPageSize.Text = pageSize.ToString(); //确定应该显示的页码 if (pageNo >= pageCount || pageNo == -1) { pageNo = pageCount; lnkbtnNext.Enabled = false; lnkbtnLast.Enabled = false; } else if (pageNo <= 1) { pageNo = 1; lnkbtnOne.Enabled = false; lnkbtnUp.Enabled = false; } if (pageCount <= 1) { ButtonsShow(false); } labAllPage.Text = pageCount.ToString(); labAllRecode.Text = count.ToString(); ddlList.Items.Clear();//DropdownList中items清空 int listStart = 1;//DropDownList中显示的起始页码 if (pageNo - listPages / 2 > 1) { listStart = pageNo - listPages / 2; } int listEnd = pageCount;//DropDownList中显示的最后页码 if (pageNo + listPages / 2 < pageCount) { listEnd = pageNo + listPages / 2; } for (int i = listStart; i <= listEnd; i++) { ListItem item = new ListItem("第" + i.ToString() + "页", i.ToString()); if (i == pageNo) { item.Selected = true; } ddlList.Items.Add(item); } string selectWhere = primaryKey + " not in ( select top " + ((pageNo - 1) * pageSize).ToString() + " " + primaryKey + " from " + table; if (Where != null) { selectWhere = Where + " and " + selectWhere + " where " + Where; } if (order != null) { selectWhere += " order by " + order + " )" + " order by " + order; } else { selectWhere += " ) "; } sql = "select top " +pageSize +" "+ selectField + " from " + table + " where " + selectWhere; DataTable dt = GetTable(sql); if (this.binder.GetType().Name == "DataList") { DataList bdr = binder as DataList; bdr.DataSource = dt; bdr.DataBind(); } else if (this.binder.GetType().Name == "GridView") { GridView bdr = binder as GridView; bdr.DataSource = dt; bdr.DataBind(); } else if (binder.GetType().Name == "Repeater") { Repeater bdr = binder as Repeater; bdr.DataSource = dt; bdr.DataBind(); } } catch (Exception) { } } #endregion #region 数据库操作方法 //连接字符串 private string connStr = "server=.;database=MyShopData;uid=sa;pwd=123"; private int GetCount(string sql) { using (SqlConnection conn = new SqlConnection(connStr)) { conn.Open(); try { SqlCommand cmd = new SqlCommand(sql, conn); return Convert.ToInt32(cmd.ExecuteScalar()); } catch { return 0; } } } private DataTable GetTable(string sql) { using (SqlConnection conn = new SqlConnection(connStr)) { conn.Open(); try { SqlCommand cmd = new SqlCommand(sql, conn); SqlDataAdapter adapter = new SqlDataAdapter(cmd); DataTable dt = new DataTable(); adapter.Fill(dt); return dt; } catch { return null; } } } #endregion #region 操作 protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { this.ShowPage = 1; } } //最后一页 protected void lnkbtnBack_Click(object sender, EventArgs e) { this.ShowPage = -1; } //下一页 protected void lnkbtnNext_Click(object sender, EventArgs e) { this.ShowPage = this.ShowPage + 1; } //上一页 protected void lnkbtnUp_Click(object sender, EventArgs e) { this.ShowPage = this.ShowPage - 1; } //第一页 protected void lnkbtnOne_Click(object sender, EventArgs e) { this.ShowPage = 1; } //选择页 protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { this.ShowPage = this.ShowPage; } #endregion } }

前台代码：

 <%@ Control Language="C#" AutoEventWireup="true" CodeBehind="PageApart.ascx.cs" Inherits="CommUC.PageApart" %> 当前  <asp:DropDownList ID="ddlList" runat="server" AutoPostBack="True" onselectedindexchanged="DropDownList1_SelectedIndexChanged"> </asp:DropDownList>     共<asp:Label ID="labAllPage" runat="server"></asp:Label> 页   每页<asp:Label ID="lbPageSize" runat="server"></asp:Label> 条/总<asp:Label ID="labAllRecode" runat="server"></asp:Label> 条   <asp:LinkButton ID="lnkbtnOne" runat="server" CausesValidation="False" OnClick="lnkbtnOne_Click">第一页</asp:LinkButton>  <asp:LinkButton ID="lnkbtnUp" runat="server" CausesValidation="False" OnClick="lnkbtnUp_Click">上一页</asp:LinkButton>  <asp:LinkButton ID="lnkbtnNext" runat="server" CausesValidation="False" OnClick="lnkbtnNext_Click">下一页</asp:LinkButton>  <asp:LinkButton ID="lnkbtnLast" runat="server" CausesValidation="False" OnClick="lnkbtnBack_Click">最后一页</asp:LinkButton>

大家觉得代码，很多很难对不对，其实不用怕，程序员应该要有勇气去面对一些比较长的代码。

看了代码，我想大家应该明白了，不用我多说出。

亲爱的朋友们再见！！！