WebForm分页浏览
Posted 王炜忠
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1.封装类
//封装类 using System; using System.Collections.Generic; using System.Web; /// <summary> /// Users 的摘要说明 /// </summary> public class Users { private string _UserName; public string UserName { get { return _UserName; } set { _UserName = value; } } private string _Password; public string Password { get { return _Password; } set { _Password = value; } } private string _NickName; public string NickName { get { return _NickName; } set { _NickName = value; } } private bool _Sex; public bool Sex { get { return _Sex; } set { _Sex = value; } } public string SecStr { get { return _Sex ? "男" : "女"; } } private DateTime _Birthday; public DateTime Birthday { get { return _Birthday; } set { _Birthday = value; } } public string BirthdayStr { get { return _Birthday.ToString("yyyy年MM月dd日"); } } private string _Nation; public string Nation { get { return _Nation; } set { _Nation = value; } } }
2连接数据库，建立方法
using System; using System.Collections.Generic; using System.Web; using System.Data.SqlClient; /// <summary> /// UserData 的摘要说明 /// </summary> public class UserData { SqlConnection cnn = null; SqlCommand cmd = null; public UserData() { cnn = new SqlConnection("server=.;database=ren;User=sa;pwd=123"); cmd = cnn.CreateCommand(); } /// <summary> /// 查询数据库所有内容 /// </summary> /// <returns>泛型集合</returns> public List<Users> quan() { List<Users> ulist = new List<Users>(); cmd.CommandText = "select * from Users"; cnn.Open(); SqlDataReader ss = cmd.ExecuteReader(); while(ss.Read()) { Users u = new Users(); u.UserName = ss[0].ToString(); u.Password = ss[1].ToString(); u.NickName = ss[2].ToString(); u.Sex = Convert.ToBoolean(ss[3]); u.Birthday = Convert.ToDateTime(ss[4]); u.Nation = ss[5].ToString(); ulist.Add(u); } cnn.Close(); return ulist; } /// <summary> /// /// </summary> /// <param name="dijiye">第几页</param> /// <param name="perpagenum">每一页的数量</param> /// <returns></returns> public List<Users> select(int dijiye,int perpagenum) { List<Users> ulist = null; cmd.CommandText = " select top " + perpagenum + " * from Users where UserName not in(select top " + (perpagenum*(dijiye - 1)) + " UserName from Users)"; cnn.Open(); SqlDataReader ss = cmd.ExecuteReader(); if (ss.HasRows) { ulist = new List<Users>(); while (ss.Read()) { Users u = new Users(); u.UserName = ss[0].ToString(); u.Password = ss[1].ToString(); u.NickName = ss[2].ToString(); u.Sex = Convert.ToBoolean(ss[3]); u.Birthday = Convert.ToDateTime(ss[4]); u.Nation = ss[5].ToString(); ulist.Add(u); } } cnn.Close(); return ulist; } /// <summary> /// 根据SQl语句，查询符合条件的数据 /// </summary> /// <param name="sql">SQl查询条件</param> /// <returns></returns> public List<Users> zuhe(string sql) { List<Users> ulist = new List<Users>(); cmd.CommandText =sql; cnn.Open(); SqlDataReader ss = cmd.ExecuteReader(); while (ss.Read()) { Users u = new Users(); u.UserName = ss[0].ToString(); u.Password = ss[1].ToString(); u.NickName = ss[2].ToString(); u.Sex = Convert.ToBoolean(ss[3]); u.Birthday = Convert.ToDateTime(ss[4]); u.Nation = ss[5].ToString(); ulist.Add(u); } cnn.Close(); return ulist; } }
3.页面设置
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default1.aspx.cs" Inherits="Default1" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> </head> <body> <form id="form1" runat="server"> <asp:Repeater ID="Repeater1" runat="server"> <HeaderTemplate> <table style="background-color:blue; width:100%"> <tr style="background-color:yellow;"> <td>姓名</td> <td>密码</td> <td>昵称</td> <td>性别</td> <td>生日</td> <td>民族</td> </tr> </HeaderTemplate> <ItemTemplate> <tr style="background-color:gray;"> <td><%#Eval("Username") %></td> <td><%#Eval("Password") %></td> <td><%#Eval("NickName") %></td> <td><%#Eval("Sex") %></td> <td><%#Eval("Birthday") %></td> <td><%#Eval("Nation") %></td> </tr> </ItemTemplate> <FooterTemplate> </table> </FooterTemplate> </asp:Repeater> 当前第<asp:Label ID="dijiye" runat="server" Text="Label"></asp:Label>页，共<asp:Label ID="gongjiye" runat="server" Text="Label"></asp:Label>页 <asp:LinkButton ID="shangyiye" runat="server">上一页</asp:LinkButton> <asp:LinkButton ID="xiayiye_button" runat="server">下一页</asp:LinkButton>  跳转到<asp:DropDownList AutoPostBack="true" ID="DropDownList1" runat="server"></asp:DropDownList>页 </form> </body> </html>
4、设置事件
using System; using System.Collections.Generic; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class Default1 : System.Web.UI.Page { int pagecount = 3;//规定每页的数量 protected void Page_Load(object sender, EventArgs e) { gongjiye.Text = maxpage().ToString(); //gongjiye.Text = new UserData().select(1, pagecount).Count.ToString(); shangyiye.Click += shangyiye_Click;//上一页的点击事件 xiayiye_button.Click += xiayiye_button_Click;//下一页点击事件 DropDownList1.SelectedIndexChanged += DropDownList1_SelectedIndexChanged;//索引变化事件 if (!IsPostBack) { Repeater1.DataSource = new UserData().select(1,pagecount);//第一页显示 Repeater1.DataBind(); dijiye.Text = "1";//页面开始运行就是第一页 for (int i = 1; i <= maxpage(); i++) { DropDownList1.Items.Add(new ListItem(i.ToString(), i.ToString()));//跳转按钮DropDownList1的页数添加 } } } void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)//索引变化事件 { int n = int.Parse(DropDownList1.SelectedValue);//取出选中哪一页 Repeater1.DataSource = new UserData().select(n,pagecount);//显示所选页数的内容 Repeater1.DataBind();//数据绑定 dijiye.Text = n.ToString(); } void xiayiye_button_Click(object sender, EventArgs e)//下一页点击事件 { int xia = int.Parse(dijiye.Text) + 1; if (xia > maxpage())//下一页如果大于最大页 { return; } Repeater1.DataSource = new UserData().select(xia,pagecount); Repeater1.DataBind(); dijiye.Text = xia.ToString(); } void shangyiye_Click(object sender, EventArgs e)//上一页的点击事件 { int shang = int.Parse(dijiye.Text)-1; if (shang == 0) { return; } Repeater1.DataSource = new UserData().select(shang, pagecount); Repeater1.DataBind(); dijiye.Text = shang.ToString(); } public int maxpage()//求最多有多少页 { int i; List<Users> ulist = new UserData().quan(); if (ulist == null) { i = 0; } else { i = int.Parse(Math.Ceiling(ulist.Count/(pagecount*1.0)).ToString()); } return i; } }
总之：就是拼Sql查询语句：
每页5行数据
select top 5 * from Users where UserName not in(select top 0 UserName from Users)；显示第一页信息
select top 5 * from Users where UserName not in(select top 5 UserName from Users)；显示第二页信息
以此类推。。。。。。。
select top " + perpagenum + " * from Users where UserName not in(select top " + (perpagenum*(dijiye - 1)) + " UserName from Users)
完！！！
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