将前面的条件查询功能与分页显示整合到一个页面中
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!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"> <br />
名称：<asp:TextBox ID="txt_name" runat="server"></asp:TextBox>
油耗：<asp:DropDownList ID="dr_oil" runat="server">
<asp:ListItem Text="大于" Value=">"></asp:ListItem>
<asp:ListItem Text="小于" Value="<"></asp:ListItem>
<asp:ListItem Text="大于等于" Value=">="></asp:ListItem>
<asp:ListItem Text="小于等于" Value="<="></asp:ListItem>
<asp:ListItem Text="等于" Value="="></asp:ListItem>
</asp:DropDownList>
<asp:TextBox ID="txt_oil" runat="server"></asp:TextBox>
价格：<asp:DropDownList ID="dr_Price" runat="server">
<asp:ListItem Text="任意价格" Value="null"></asp:ListItem>
<asp:ListItem Text="20万至30万" Value="price >=20 and price <=30"></asp:ListItem>
<asp:ListItem Text="30万至40万" Value="price >=30 and price <=40"></asp:ListItem>
<asp:ListItem Text="大于40万" Value="price > 40"></asp:ListItem>
</asp:DropDownList>
<asp:Button ID="Button1" runat="server" Text="查询" />
<br /><br />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<br /><br /> <table style="width: 100%; text-align: center; background-color: navy;">
<tr style="color: white;">
<td>ids</td>
<td>编号</td>
<td>名称</td>
<td>油耗</td>
<td>马力</td>
<td>排量</td>
<td>价格</td>
</tr>
<asp:Repeater ID="Repeater1" runat="server">
<ItemTemplate>
<tr style="background-color: white;">
<td><%#Eval("Ids") %></td>
<td><%#Eval("Code") %></td>
<td><%#Eval("Name") %></td>
<td><%#Eval("Oil") %></td>
<td><%#Eval("Powers") %></td>
<td><%#Eval("Exhaust") %></td>
<td><%#Eval("Price") %></td>
</tr>
</ItemTemplate>
</asp:Repeater>
</table>
<br />
当前第[
<asp:Literal ID="lit_NowNumber" runat="server" Text=""></asp:Literal>
]页
共[
<asp:Literal ID="lit_MaxNumber" runat="server" Text=""></asp:Literal>
]页
<asp:Button ID="btn_first" runat="server" Text="首页" />
<asp:Button ID="btn_prev" runat="server" Text="上一页" />
<asp:Button ID="btn_next" runat="server" Text="下一页" />
<asp:Button ID="btn_last" runat="server" Text="尾页" />
<asp:DropDownList AutoPostBack="true" ID="DropDownList1" runat="server"></asp:DropDownList>
<asp:Button ID="btn_jump" runat="server" Text="跳转" />
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label> </form>
</body>
</html>
展示页代码
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls; public partial class _Default : System.Web.UI.Page
{
int PageCount = ; //每页显示条数 protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Repeater1.DataSource = new carData().Select(PageCount, );//绑定所有数据
Repeater1.DataBind(); lit_MaxNumber.Text = MaxPageNumber().ToString(); //将一共有多少页绑定到下拉列表中
for (int i = ; i <= MaxPageNumber(); i++)
{
ListItem li = new ListItem(i.ToString(), i.ToString());
DropDownList1.Items.Add(li);
} }
btn_last.Click += btn_last_Click;
btn_next.Click += btn_next_Click;
btn_prev.Click += btn_prev_Click;
btn_first.Click += btn_first_Click;
btn_jump.Click += btn_jump_Click; DropDownList1.SelectedIndexChanged += btn_jump_Click;//下拉列表选值改变时，查询结果立刻改变 Button1.Click += Button1_Click;
} //组合查询
void Button1_Click(object sender, EventArgs e)
{
Repeater1.DataSource = EndData();
Repeater1.DataBind();
lit_NowNumber.Text = ""; //最大页数改变*******
lit_MaxNumber.Text = MaxPageNumber2().ToString(); } //跳转
void btn_jump_Click(object sender, EventArgs e)
{
int a = Convert.ToInt32(DropDownList1.SelectedValue);
//将下一页数据绑定
Repeater1.DataSource = new carData().Select(PageCount, a);
Repeater1.DataBind(); //将当前显示的页数改变到页面上去
lit_NowNumber.Text = a.ToString();
} //首页
void btn_first_Click(object sender, EventArgs e)
{
//将第一页数据绑定
Repeater1.DataSource = EndData();
Repeater1.DataBind(); //将当前显示的页数改变到页面上去
lit_NowNumber.Text = "";
} //上一页
void btn_prev_Click(object sender, EventArgs e)
{
//获取当前页数，计算上一页页数
int nextNumber = Convert.ToInt32(lit_NowNumber.Text) - ; if (nextNumber < )
{
return;
} //将下一页数据绑定到
Repeater1.DataSource = EndData(nextNumber);
Repeater1.DataBind(); //将当前显示的页数改变到页面上去
lit_NowNumber.Text = nextNumber.ToString();
} //下一页
void btn_next_Click(object sender, EventArgs e)
{
//获取当前页数，计算下一页页数
int nextNumber = Convert.ToInt32(lit_NowNumber.Text) + ; if (nextNumber > MaxPageNumber2())
{
return;
} //将下一页数据绑定到
Repeater1.DataSource = EndData(nextNumber);
Repeater1.DataBind(); //将当前显示的页数改变到页面上去
lit_NowNumber.Text = nextNumber.ToString();
} //尾页
void btn_last_Click(object sender, EventArgs e)
{
//将尾页数据绑定到
Repeater1.DataSource = new carData().Select(PageCount, MaxPageNumber2());
Repeater1.DataBind(); //将当前显示的页数改变到页面上去
lit_NowNumber.Text = MaxPageNumber().ToString();
} //计算页数
public int MaxPageNumber()
{
int a = ;
int maxcount = new carData().SelectCount();
decimal d = Convert.ToDecimal(maxcount) / PageCount; //两个 int 计算 获得 int 类型的数据
a = Convert.ToInt32(Math.Ceiling(d));
return a;
} //查询每一页的方法
public List<car> EndData(int n)
{
int count = ;
string tsql = "select top " + PageCount + " *from car "; string sql1 = ""; if (txt_name.Text.Trim().Length > )
{
sql1 += "where name like '%" + txt_name.Text.Trim() + "%' ";
count++;
} if (txt_oil.Text.Trim().Length > )
{
if (count > )
{
sql1 += "and oil " + dr_oil.SelectedValue + " " + txt_oil.Text.Trim() + " ";
}
else
{
sql1 += "where oil " + dr_oil.SelectedValue + " " + txt_oil.Text.Trim() + " ";
}
count++;
} if (dr_Price.SelectedValue != "null")
{
if (count > )
{
sql1 += " and " + dr_Price.SelectedValue;
}
else
{
sql1 += " where " + dr_Price.SelectedValue;
}
count++;
} tsql += sql1; if (count > )
{
tsql += " and ids not in(select top " + (PageCount * (n - )) + " ids from car " + sql1 + ")";
}
else
{
tsql += " where ids not in(select top " + (PageCount * (n - )) + " ids from car " + sql1 + ")";
} Label1.Text = tsql; List<car> clist = new carData().SelectAll(tsql, new Hashtable());
return clist;
} //查询所有记录的方法
public int MaxPageNumber2()
{
int end = ;
int count = ;
string tsql = "select count(*) from car "; string sql1 = ""; if (txt_name.Text.Trim().Length > )
{
sql1 += "where name like '%" + txt_name.Text.Trim() + "%' ";
count++;
} if (txt_oil.Text.Trim().Length > )
{
if (count > )
{
sql1 += "and oil " + dr_oil.SelectedValue + " " + txt_oil.Text.Trim() + " ";
}
else
{
sql1 += "where oil " + dr_oil.SelectedValue + " " + txt_oil.Text.Trim() + " ";
}
count++;
} if (dr_Price.SelectedValue != "null")
{
if (count > )
{
sql1 += " and " + dr_Price.SelectedValue;
}
else
{
sql1 += " where " + dr_Price.SelectedValue;
}
count++;
} tsql += sql1; int aaa = new carData().SelectCount(tsql);
Label2.Text = aaa.ToString(); end = Convert.ToInt32(Math.Ceiling(Convert.ToDecimal(aaa) / PageCount));
return end; } }
后台代码
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Web; /// <summary>
/// carData 的摘要说明
/// </summary>
public class carData
{
SqlConnection conn = null;
SqlCommand cmd = null; public carData()
{
conn = new SqlConnection("server=.;database=Data0216;user=sa;pwd=123");
cmd = conn.CreateCommand();
} //第一次加载时查询所有数据（ 每条显示多少， 第几页）
public List<car> Select(int pcount, int pnumber)
{
List<car> clist = new List<car>();
cmd.CommandText = "select top " + pcount + " * from car where ids not in(select top " + (pcount * (pnumber - )) + " ids from car)";
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
car c = new car();
c.Ids = Convert.ToInt32(dr["ids"]);
c.Code = dr["code"].ToString();
c.Name = dr["name"].ToString();
c.Oil = Convert.ToDecimal(dr["oil"]);
c.Powers = Convert.ToInt32(dr["powers"]);
c.Exhaust = Convert.ToInt32(dr["exhaust"]);
c.Price = Convert.ToDecimal(dr["price"]);
clist.Add(c);
}
conn.Close();
return clist;
} //组合查询的所有结果
public int SelectCount(string tsql)
{
int a = ;
cmd.CommandText = tsql;
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
dr.Read();
a = Convert.ToInt32(dr[]);
conn.Close();
return a;
} //将查询语句放入字符串中传值，
public List<car> SelectAll(string tsql, Hashtable hh)
{
List<car> clist = new List<car>();
cmd.CommandText = tsql;
cmd.Parameters.Clear();
foreach (string s in hh.Keys)
{
cmd.Parameters.Add(s, hh[s]);
}
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
car c = new car();
c.Ids = Convert.ToInt32(dr["ids"]);
c.Code = dr["code"].ToString();
c.Name = dr["name"].ToString();
c.Oil = Convert.ToDecimal(dr["oil"]);
c.Powers = Convert.ToInt32(dr["powers"]);
c.Exhaust = Convert.ToInt32(dr["exhaust"]);
c.Price = Convert.ToDecimal(dr["price"]);
clist.Add(c);
}
conn.Close();
return clist;
} }
方法