以Car表和Brand表为例，其中Car表的Brand是Brand表的Brandcode。

（1）建立两表的linq（一定要做好主外键关系，），创建之后不用修改，如要添加，另建文件。

（2）Car表的属性扩展（注意partial）

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

/// <summary>

/// Car 的摘要说明

/// </summary>

public partial class Car

{

    public string BrandStr

    {

        get {

            return this.Brand1.Brand_Name;

        }

    }

}

（3）Car表和Brand表的封装方法（模糊查，开头，结尾，个数，最大值，最小值，平均值，求和，升序，降序，分页，组合查询都在CarData里面）

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

/// <summary>

/// BrandData 的摘要说明

/// </summary>

public class BrandData

{

    mydbDataContext cnn = null;

    public BrandData()

    {

        cnn = new mydbDataContext();

    }

    public List<Brand> quan()

    {

        return cnn.Brand.ToList();

    }

}
using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

/// <summary>

/// CarData 的摘要说明

/// </summary>

public class CarData

{

    mydbDataContext cnn = null;

    public CarData()

    {

        cnn = new mydbDataContext();

    }

    /// <summary>

    /// 查询全部信息

    /// </summary>

    /// <returns>泛型集合</returns>

    public List<Car> quan()

    {

        return cnn.Car.ToList();

    }

    /// <summary>

    /// 根据名字模糊查询

    /// </summary>

    /// <param name="name">名称中的某一段字</param>

    /// <returns>泛型集合</returns>

    public List<Car> selectname(string name)

    {

        return cnn.Car.Where(r => r.Name.Contains(name)).ToList();

    }

  /// <summary>

    /// 查询name以n开头的所有数据

  /// </summary>

    /// <param name="n">name以n开头的字</param>

  /// <returns></returns>

    public List<Car> selectstartname(string n)

    {

        return cnn.Car.Where(r => r.Name.StartsWith(n)).ToList();//r.name可以换成别的列

    }

    /// <summary>

    /// 查询name以n结束的所有数据

    /// </summary>

    /// <param name="n">name以n结束的字</param>

    /// <returns></returns>

    public List<Car> selectendname(string n)

    {

        return cnn.Car.Where(r => r.Name.EndsWith(n)).ToList();//r.name可以换成别的列

    }

    /// <summary>

    /// 查询价格最高的那个数

    /// </summary>

    /// <returns>最大数</returns>

    public decimal? selectpricemax()

    {

      return   cnn.Car.Max(r => r.Price);

    }

    /// <summary>

    /// 查询价格最小的那个数

    /// </summary>

    /// <returns>最小数</returns>

    public decimal? selectpricemin()

    {

        return cnn.Car.Min(r => r.Price);

    }

    /// <summary>

    /// 查询价格的平均数

    /// </summary>

    /// <returns>平均数</returns>

    public decimal? selectpriceavg()

    {

        return cnn.Car.Average(r=>r.Price);

    }

    /// <summary>

    /// 查询价格的总数

    /// </summary>

    /// <returns>价格总数</returns>

    public decimal? selectpricesum()

    {

        return cnn.Car.Sum(r=>r.Price);

    }

    /// <summary>

    /// 按照价格升序进行排列的集合

    /// </summary>

    /// <returns>集合</returns>

    public List<Car> order()

    {

        return cnn.Car.OrderBy(r=>r.Price).ToList();//按照价格升序

    }

    /// <summary>

    /// 按照价格降序进行排列的集合

    /// </summary>

    /// <returns>集合</returns>

    public List<Car> descorder()

    {

        return cnn.Car.OrderByDescending(r => r.Price).ToList();

    }

    /// <summary>

    /// 分页显示

    /// </summary>

    /// <param name="pagecount">每一页的页数</param>

    /// <param name="num">第几页</param>

    /// <returns>集合</returns>

    public List<Car> fenye(int pagecount, int num)

    {

        return cnn.Car.Skip(pagecount * (num - )).Take(pagecount).ToList();//cnn.Car表示所有的数据

    }

    /// <summary>

    /// 组合分页查询

    /// </summary>

    /// <param name="clist">所需要分页的集合</param>

    /// <param name="pagecount">每一页的页数</param>

    /// <param name="num">第几页</param>

    /// <returns></returns>

    public List<Car> zufen(List<Car> clist, int pagecount, int num)

    {

      return   clist.Skip(pagecount * (num - )).Take(pagecount).ToList();//clist表示所需要分页的集合

    }

}

（4）页面设计

<%@ 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">

        名称<asp:TextBox ID="name_text" runat="server"></asp:TextBox>

        品牌<asp:DropDownList ID="brand_dd" runat="server"></asp:DropDownList>

        价格<asp:DropDownList ID="pri_dd" runat="server">

            <asp:ListItem>&gt;=</asp:ListItem>

            <asp:ListItem>&lt;=</asp:ListItem>

        </asp:DropDownList><asp:TextBox ID="price_text" runat="server"></asp:TextBox>

        <asp:Button ID="enter_btn" runat="server" Text="确定" />

        <br />

        <asp:Label ID="Label1" runat="server" Text=""></asp:Label>

        <asp:Repeater ID="Repeater1" runat="server">

            <HeaderTemplate>

                <table style="width:100%; background-color:blue;">

                <tr>

                     <td>序号</td>

                    <td>名称</td>

                    <td>品牌</td>

                    <td>时间</td>

                    <td>油耗</td>

                    <td>马力</td>

                    <td>价格</td>

                    <td>照片</td>

                </tr>

            </HeaderTemplate>

            <ItemTemplate>

                 <tr style="background-color:gray" class="a">

                     <td><%#Container.ItemIndex+ %></td>

                    <td><%#Eval("Name") %></td>

                    <td><%#Eval("BrandStr") %></td>

                    <td><%#Eval("Time","{0:yyyy年MM月dd日}") %></td>

                    <td><%#Eval("Oil") %></td>

                    <td><%#Eval("Powers") %></td>

                    <td><%#Eval("Price") %></td>

                    <td><%#Eval("Pic") %></td>

                </tr>

            </ItemTemplate>

            <FooterTemplate>

                </table>

            </FooterTemplate>

        </asp:Repeater>

        当前第【<asp:Label ID="numLabel" runat="server" Text=""></asp:Label>】页，共【<asp:Label ID="sumLabel" runat="server" Text=""></asp:Label>】页 &nbsp;&nbsp;&nbsp;

        <asp:LinkButton ID="previewButton" runat="server">上一页</asp:LinkButton>&nbsp;

        <asp:LinkButton ID="nextButton" runat="server">下一页</asp:LinkButton> &nbsp;&nbsp;&nbsp;

        跳转到第<asp:DropDownList ID="page_dd" runat="server" AutoPostBack="true"></asp:DropDownList>页

    </form>

</body>

</html>

<script>

    var all = new Array();

    all =document.getElementsByClassName("a");

    for (var i = ; i < all.length; i++)

    {

        var old;

        all[i].onmouseover = function ()

        {

            old = this.style.backgroundColor;

            this.style.backgroundColor = "yellow";

        }

        all[i].onmouseout = function () {

            this.style.backgroundColor = old;

        }

    }

</script>

（5）C#端代码

using System;

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 = ;

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            List<Car> list = new CarData().quan();

            Repeater1.DataSource = new CarData().fenye(pagecount, ); ;

            Repeater1.DataBind();

            List<Brand> blist = new BrandData().quan();

            brand_dd.Items.Add(new ListItem("全部","null"));

            for(int i=;i<blist.Count;i++)

            {

            brand_dd.Items.Add(new ListItem(blist[i].Brand_Name,blist[i].Brand_Code));

            }

            numLabel.Text = "";

            sumLabel.Text = pagemax(list, pagecount).ToString();

            for (int i = ; i <= int.Parse(sumLabel.Text); i++)

            {

                page_dd.Items.Add(new ListItem(i.ToString(),i.ToString()));

            }

        }

        enter_btn.Click += enter_btn_Click;//查询按钮点击事件

        nextButton.Click += nextButton_Click;//下一页的点击事件

        previewButton.Click += previewButton_Click;//上一页的事件

        page_dd.SelectedIndexChanged += page_dd_SelectedIndexChanged;//跳转到第几页事件

    }

    void page_dd_SelectedIndexChanged(object sender, EventArgs e)//跳转到第几页事件

    {

        int c = int.Parse(page_dd.SelectedValue);

        using (mydbDataContext cnn = new mydbDataContext())//运用多个集合的交集方法

        {

            int aa = int.Parse(page_dd.SelectedValue);

            numLabel.Text = aa.ToString();//第几页中的页数

            var all = cnn.Car.AsEnumerable();//相当于拼接sql语句

            if (name_text.Text.Trim().Length > )

            {

                var nlist = cnn.Car.Where(r => r.Name.Contains(name_text.Text.Trim()));

                all = all.Intersect(nlist);//取all集合和nlist集合的公共部分

            }

            if (brand_dd.SelectedValue == "null")

            { }

            else

            {

                var blist = cnn.Car.Where(r => r.Brand == brand_dd.SelectedValue);

                all = all.Intersect(blist);

            }

            if (price_text.Text.Trim().Length > )

            {

                if (pri_dd.SelectedIndex == )

                {

                    var plist = cnn.Car.Where(r => r.Price >= decimal.Parse(price_text.Text.Trim()));

                    all = all.Intersect(plist);

                }

                else

                {

                    var plist = cnn.Car.Where(r => r.Price <= decimal.Parse(price_text.Text.Trim()));

                    all = all.Intersect(plist);

                }

            }

            Repeater1.DataSource = new CarData().zufen(all.ToList(), pagecount,aa);

            Repeater1.DataBind();

        }

    }

    void previewButton_Click(object sender, EventArgs e)//上一页的事件

    {

        using (mydbDataContext cnn = new mydbDataContext())//运用多个集合的交集方法

        {

            int a = int.Parse(numLabel.Text) -;//哪一页的页数

            if (a <= )//判断有没有到最后一页

            {

                return;

            }

            numLabel.Text = a.ToString();//第几页中的页数

            var all = cnn.Car.AsEnumerable();//相当于拼接sql语句

            if (name_text.Text.Trim().Length > )

            {

                var nlist = cnn.Car.Where(r => r.Name.Contains(name_text.Text.Trim()));

                all = all.Intersect(nlist);//取all集合和nlist集合的公共部分

            }

            if (brand_dd.SelectedValue == "null")

            { }

            else

            {

                var blist = cnn.Car.Where(r => r.Brand == brand_dd.SelectedValue);

                all = all.Intersect(blist);

            }

            if (price_text.Text.Trim().Length > )

            {

                if (pri_dd.SelectedIndex == )

                {

                    var plist = cnn.Car.Where(r => r.Price >= decimal.Parse(price_text.Text.Trim()));

                    all = all.Intersect(plist);

                }

                else

                {

                    var plist = cnn.Car.Where(r => r.Price <= decimal.Parse(price_text.Text.Trim()));

                    all = all.Intersect(plist);

                }

            }

            Repeater1.DataSource = new CarData().zufen(all.ToList(), pagecount, a);

            Repeater1.DataBind();

        }

    }

    void nextButton_Click(object sender, EventArgs e)//下一页的点击事件

    {

        using (mydbDataContext cnn = new mydbDataContext())//运用多个集合的交集方法

        {

            int a = int.Parse(numLabel.Text) + ;//哪一页的页数

            if (a > int.Parse(sumLabel.Text))//判断有没有到最后一页

            {

                return;

            }

            numLabel.Text = a.ToString();//第几页中的页数

            var all = cnn.Car.AsEnumerable();//相当于拼接sql语句

            if (name_text.Text.Trim().Length > )

            {

                var nlist = cnn.Car.Where(r => r.Name.Contains(name_text.Text.Trim()));

                all = all.Intersect(nlist);//取all集合和nlist集合的公共部分

            }

            if (brand_dd.SelectedValue == "null")

            { }

            else

            {

                var blist = cnn.Car.Where(r => r.Brand == brand_dd.SelectedValue);

                all = all.Intersect(blist);

            }

            if (price_text.Text.Trim().Length > )

            {

                if (pri_dd.SelectedIndex == )

                {

                    var plist = cnn.Car.Where(r => r.Price >= decimal.Parse(price_text.Text.Trim()));

                    all = all.Intersect(plist);

                }

                else

                {

                    var plist = cnn.Car.Where(r => r.Price <= decimal.Parse(price_text.Text.Trim()));

                    all = all.Intersect(plist);

                }

            }

            Repeater1.DataSource = new CarData().zufen(all.ToList(),pagecount,a);

            Repeater1.DataBind();

        }

    }

    void enter_btn_Click(object sender, EventArgs e)//查询按钮点击事件

    {

        using (mydbDataContext cnn = new mydbDataContext())//运用多个集合的交集方法

        {

            page_dd.Items.Clear();

            var all = cnn.Car.AsEnumerable();//相当于拼接sql语句

            if (name_text.Text.Trim().Length>)

            {

                var nlist = cnn.Car.Where(r => r.Name.Contains(name_text.Text.Trim()));

                all = all.Intersect(nlist);

            }

            if (brand_dd.SelectedValue == "null")

            { }

            else

            {

                var blist = cnn.Car.Where(r => r.Brand == brand_dd.SelectedValue);

                all = all.Intersect(blist);

            }

            if (price_text.Text.Trim().Length > )

            {

                if (pri_dd.SelectedIndex == )

                {

                    var plist = cnn.Car.Where(r => r.Price >= decimal.Parse(price_text.Text.Trim()));

                    all = all.Intersect(plist);

                }

                else

                {

                    var plist = cnn.Car.Where(r => r.Price <= decimal.Parse(price_text.Text.Trim()));

                    all = all.Intersect(plist);

                }

            }

            Repeater1.DataSource = new CarData().zufen(all.ToList(), pagecount, );

            Repeater1.DataBind();

            sumLabel.Text = pagemax(all.ToList(), pagecount).ToString();

            numLabel.Text = "";

            for (int i = ; i <= pagemax(all.ToList(), pagecount); i++)

            {

                page_dd.Items.Add(new ListItem(i.ToString(),i.ToString()));

            }

        }

        //if (name_text.Text.Trim() == "" && brand_dd.SelectedValue=="null" && price_text.Text.Trim() == "")//如果没有条件就查询全部

        //{

        //    Repeater1.DataSource = new CarData().quan();

        //    Repeater1.DataBind();

        //    return;

        //}

            //Repeater1.DataSource = new CarData().selectname(name_text.Text.Trim());//根据name中的XXX模糊查询

            // Repeater1.DataSource = new CarData().selectstartname(name_text.Text.Trim());//name以XXX开头来查询

            //Repeater1.DataSource = new CarData().selectendname(name_text.Text.Trim());//name以XXX结束来查询

            //Label1.Text = new CarData().selectendname(name_text.Text.Trim()).Count.ToString();//获取符合条件的个数。其实就是根据模糊查询查出来的集合的子集个数。

            //Repeater1.DataSource = new CarData().descorder();//按照价格降序进行排列

            //Label1.Text = new CarData().selectpricemax().ToString();//查询价格最大的那个数

            //Label1.Text = new CarData().selectpriceavg().ToString();//查询价格的平均数

            //Label1.Text = new CarData().selectpricesum().ToString();//查询价格的总数

            //Repeater1.DataBind();

    }

    public int pagemax(List<Car> clist,int pagecount)//求最大页数

    {

        int a = clist.Count;

      return Convert.ToInt32(Math.Ceiling(a / (pagecount * 1.0)));

    }

}

完！！

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