分页用户控件
参考http://www.cnblogs.com/hongyuniu/archive/2008/08/05/1261014.html
前台代码
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs" Inherits="WebUserControl" %> <div style="text-align:right; width:100%;background-color:#c6d7ef"> <table cellpadding="0" cellspacing="0"> <tr> <td style="width: 200px; text-align: right"> <asp:Label ID="Label1" runat="server" Text="当前页:"></asp:Label><asp:Label ID="lblCurrentInfo" runat="server">1</asp:Label> <asp:Label ID="Label2" runat="server" Text="共"></asp:Label><asp:Label ID="lblCount" runat="server">1</asp:Label><asp:Label ID="Label3" runat="server" Text="页"></asp:Label><asp:Label ID="lblTotalNum" runat="server">5</asp:Label><asp:Label ID="Label5" runat="server" Text="条"></asp:Label> </td> <td style="width: 33px"> <asp:LinkButton ID="lbtnFirst" runat="server" OnClick="PageIndex_Changed">首页</asp:LinkButton></td> <td style="width: 50px"> <asp:LinkButton ID="lbtnPrev" runat="server" OnClick="PageIndex_Changed">上一页</asp:LinkButton></td> <td style="width: 50px"> <asp:LinkButton ID="lbtnNext" runat="server" OnClick="PageIndex_Changed">下一页</asp:LinkButton></td> <td style="width: 33px"> <asp:LinkButton ID="lbtnLast" runat="server" OnClick="PageIndex_Changed">末页</asp:LinkButton></td> </tr> </table></div>
后台代码
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.ComponentModel; using System.Data; using System.Data.OleDb; using System.Data.SqlClient; public partial class WebUserControl : System.Web.UI.UserControl { #region Properties [BrowsableAttribute(true)] [DescriptionAttribute("要绑定数据的GridView.ID")] [DefaultValueAttribute("")] [CategoryAttribute("Appearance")] public string gvID { get { return (ViewState["gvID"] == null) ? "" : ViewState["gvID"].ToString(); } set { ViewState["gvID"] = value; } } [BrowsableAttribute(true)] [DescriptionAttribute("每一页显示的行数，默认每页10条")] [DefaultValueAttribute("")] [CategoryAttribute("Appearance")] public int PageSize { get { return (ViewState["PageSize"] == null) ? 10 : Convert.ToInt32(ViewState["PageSize"]); } set { ViewState["PageSize"] = value; } } [BrowsableAttribute(true)] [DescriptionAttribute("要从中读取数据的DataTable.Name")] [DefaultValueAttribute("")] [CategoryAttribute("Data")] public string TableName { get { return (ViewState["TableName"] == null) ? "" : ViewState["TableName"].ToString(); } set { ViewState["TableName"] = value; } } [BrowsableAttribute(true)] [DescriptionAttribute("要从中读取数据的DataTable.Name")] [DefaultValueAttribute("")] [CategoryAttribute("Data")] public string OrderBy { get { return (ViewState["OrderBy"] == null) ? "" : ViewState["OrderBy"].ToString(); } set { ViewState["OrderBy"] = value; } } public string PrimaryKey { get { return (ViewState["PrimaryKey"] == null) ? "" : ViewState["PrimaryKey"].ToString(); } set { ViewState["PrimaryKey"] = value; } } [BrowsableAttribute(true)] [DescriptionAttribute("读取数据的Sql语句，多表 联合查询")] [DefaultValueAttribute("")] [CategoryAttribute("Data")] public string Sql { get { return (ViewState["Sql"] == null) ? "" : ViewState["Sql"].ToString(); } set { ViewState["Sql"] = value; } } [BrowsableAttribute(true)] [DescriptionAttribute("过滤条件，可以为空")] [DefaultValueAttribute("")] [CategoryAttribute("Data")] public string FilterString { get { return (ViewState["FilterString"] == null) ? "" : ViewState["FilterString"].ToString(); } set { ViewState["FilterString"] = value; } } [BrowsableAttribute(false)] [DescriptionAttribute("当前页数")] [DefaultValueAttribute("")] public int CurrentInfo { get { return Convert.ToInt32(lblCurrentInfo.Text.Trim()); } } #endregion SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["SqlServer"].ConnectionString); // OleDbConnection conn = new OleDbConnection(System.Configuration.ConfigurationManager.ConnectionStrings["SqlServer"].ConnectionString); // OleDbCommand comm = new OleDbCommand(); SqlCommand comm = new SqlCommand(); string sql = ""; protected override void OnInit(EventArgs e) { this.Visible = false; } protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { //this.lbtnPrev.Enabled = false; //this.lblCurrentInfo.Text = "1"; } } /// <summary> /// 绑定GridView控件，供页面调用 /// </summary> public void BindGridView() { GetPageNum(); //this.Visible = false; this.lbtnPrev.Enabled = false; this.lblCurrentInfo.Text = "1"; BindGV(); } /// <summary> /// 绑定GridView控件，供页面调用 /// </summary> /// <param name="currentInfo">要显示的当前页</param> public void BindGridView(int currentInfo) { GetPageNum(); //this.Visible = false; this.lbtnPrev.Enabled = false; this.lblCurrentInfo.Text = currentInfo.ToString(); BindGV(); } /// <summary> /// 获取结果总数目和总页数 /// </summary> /// <returns>总页数</returns> public int GetPageNum() { sql = ""; sql += "select count(*) from ( "; sql += Sql; sql += FilterString + ") as a "; comm.CommandText = sql; comm.Connection = conn; conn.Open(); int TotalNum = Convert.ToInt32(comm.ExecuteScalar()); conn.Close(); lblTotalNum.Text = TotalNum.ToString(); int pageNum = Convert.ToInt32(Math.Ceiling(Convert.ToDouble((double)TotalNum / PageSize))); lblCount.Text = pageNum.ToString(); return TotalNum; } #region 按钮处理事件 /**/ /// <summary> /// 按钮处理事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> public void PageIndex_Changed(object sender, EventArgs e) { LinkButton linkbtn = (LinkButton)sender; switch (linkbtn.ID.Trim()) { case "lbtnFirst": this.lblCurrentInfo.Text = "1"; BindGV(); break; case "lbtnPrev": this.lblCurrentInfo.Text = (Convert.ToInt32(this.lblCurrentInfo.Text) - 1).ToString(); BindGV(); break; case "lbtnNext": this.lblCurrentInfo.Text = (Convert.ToInt32(this.lblCurrentInfo.Text) + 1).ToString(); BindGV(); break; case "lbtnLast": this.lblCurrentInfo.Text = this.lblCount.Text; BindGV(); break; } SetBtnState(); } private void SetBtnState() { if (Convert.ToInt32(this.lblCurrentInfo.Text) >= Convert.ToInt32(this.lblCount.Text) && Convert.ToInt32(this.lblCurrentInfo.Text) <= 1) { this.lbtnPrev.Enabled = false; this.lbtnNext.Enabled = false; this.lbtnFirst.Enabled = false; this.lbtnLast.Enabled = false; } else if (Convert.ToInt32(this.lblCurrentInfo.Text) >= Convert.ToInt32(this.lblCount.Text)) { this.lbtnPrev.Enabled = true; this.lbtnNext.Enabled = false; this.lbtnFirst.Enabled = true; this.lbtnLast.Enabled = false; } else if (Convert.ToInt32(this.lblCurrentInfo.Text) <= 1) { this.lbtnPrev.Enabled = false; this.lbtnNext.Enabled = true; this.lbtnFirst.Enabled = false; this.lbtnLast.Enabled = true; } else { this.lbtnPrev.Enabled = true; this.lbtnNext.Enabled = true; this.lbtnFirst.Enabled = true; this.lbtnLast.Enabled = true; } } #endregion /// <summary> /// 获取数据绑定GridView /// </summary> private void BindGV() { int lower, upper; int currentPage = Convert.ToInt32(lblCurrentInfo.Text.Trim()); lower = (currentPage - 1) * PageSize; upper = lower + PageSize; DataTable dt = new DataTable(); sql = ""; sql += "select top " + PageSize.ToString() + " * from (" + Sql + FilterString + ") as a "; if (lower > 0) { sql += " where " + PrimaryKey + " not in (select top " + lower.ToString() + " " + PrimaryKey + " from (" + Sql + FilterString + ") as b)"; } sql += ""+OrderBy+""; comm.CommandText = sql; comm.Connection = conn; // OleDbDataAdapter da = new OleDbDataAdapter(comm); SqlDataAdapter da = new SqlDataAdapter(comm); conn.Open(); da.Fill(dt); conn.Close(); if (dt.Rows.Count == 0) { this.Visible = false; } else { this.Visible = true; } GridView gv = (GridView)Page.FindControl(gvID); gv.DataSource = dt; gv.DataBind(); SetBtnState(); } }
页面引用：
<%@ Register src="WebUserControl.ascx" tagname="WebUserControl" tagprefix="uc1" %>
gridview下面
<uc1:WebUserControl ID="WebUserControl1" runat="server" />
页面后台：
绑定
string sql = "select * from employee";
WebUserControl1.gvID = GridView1.ClientID;
WebUserControl1.Sql = sql;
WebUserControl1.OrderBy = "order by emplID ";
WebUserControl1.PrimaryKey = "emplID";
WebUserControl1.BindGridView();
