多条件查询：逐条判断，从第一个条件开始判断，如果满足，取出放入集合，再从集合中查询第二个条件。。。
aspx代码：
1 <body>
2 <form id="form1" runat="server">
3
4 <br />
5 <asp:Label ID="Label1" runat="server" Text="关键字："></asp:Label>
6 <asp:TextBox ID="Gjz" runat="server" Font-Size="12px"></asp:TextBox>
7
8 <asp:Label ID="Label2" runat="server" Text="价格："></asp:Label>
9 <asp:TextBox ID="price1" runat="server" Font-Size="12px" Width="52px"></asp:TextBox>
10
11 <asp:Label ID="Label3" runat="server" Text="到"></asp:Label>
12
13 <asp:TextBox ID="price2" runat="server" Font-Size="12px" Width="52px"></asp:TextBox>
14
15 <asp:Button ID="select" runat="server" Text="查询" OnClick="select_Click" />
16 <br />
17 <br />
18 <asp:Repeater ID="Repeater1" runat="server">
19 <HeaderTemplate>
20 <table width="903" border="0" cellspacing="1" cellpadding="0" bgcolor="#6600FF">
21 <tr style="height:25px;">
22 <td width="260" bgcolor="#FFFFFF">名称</td>
23 <td width="160" bgcolor="#FFFFFF">上市时间</td>
24 <td width="160" bgcolor="#FFFFFF">油耗</td>
25 <td width="160" bgcolor="#FFFFFF">功率</td>
26 <td width="163" bgcolor="#FFFFFF">价格</td>
27 </tr>
28 </HeaderTemplate>
29
30 <ItemTemplate>
31 <tr style="height:25px;">
32 <td bgcolor="#FFFFFF"><%#Eval("Name") %></td>
33 <td bgcolor="#FFFFFF"><%#Eval("Time","{0:yyyy年MM月dd日}") %></td>
34 <td bgcolor="#FFFFFF"><%#Eval("Oil") %></td>
35 <td bgcolor="#FFFFFF"><%#Eval("Powers") %></td>
36 <td bgcolor="#FFFFFF"><%#Eval("Price") %></td>
37 </tr>
38
39 </ItemTemplate>
40
41 <FooterTemplate>
42
43 </table>
44
45 </FooterTemplate>
46
47
48 </asp:Repeater>
49 </form>
50 </body>
aspx.cs代码：
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Web;
5 using System.Web.UI;
6 using System.Web.UI.WebControls;
7
8 public partial class test : System.Web.UI.Page
9 {
10 protected void Page_Load(object sender, EventArgs e)
11 {
12 if(!IsPostBack)
13 {
14 coenctDataContext _conext = new coenctDataContext();
15 Repeater1.DataSource= _conext.Car;
16 Repeater1.DataBind();
17 }
18 }
19
20
21 protected void select_Click(object sender, EventArgs e)
22 {
23 coenctDataContext _contest = new coenctDataContext();
24
25 List<Car> list = _contest.Car.ToList();
26 string key =Gjz.Text.ToString();
27
28 //判断第一个条件是否为空，如果为空不操作，去判断第二个条件看是否满足；不为空，继续 继续查询
29 if (key != "")
30 {
31 list = list.Where(p => p.Name.Contains(key)).ToList();
32 //关键字变原色，用foreach去查看集合中满足条件的字
33 foreach(Car data in list )
34 {
35 string s = data.Name.Replace(key, "<span style ='color:red;'>" + key + "</span>");
36 data.Name = s;
37 }
38 }
39
40 //判断第二个条件
41 string mi = price1.Text;//取text判断是否为空
42 string ma = price2.Text;//取text判断是否为空
43
44 //先判断第二个条件中，文本框中是否为空
45 if(mi !="" && ma != "")
46 {
47 decimal min = Convert.ToDecimal(price1.Text);
48 decimal max = Convert.ToDecimal(price2.Text);
49
50 list= list.Where(p=>p.Price.Value>=min && p.Price<=max).ToList();
51
52 }
53
54 //指定数据源显示出来
55 Repeater1.DataSource = list;
56 Repeater1.DataBind();
57
58 }
59 }