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Tingq 模糊查询共多少条数据最大、小、平均、求和值升、降序

页面代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>

<!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>
     <style type="text/css">
        #tb1 {
             100%;
            background-color: navy;
            text-align: center;
            border-spacing: 1px;
        }

            #tb1 thead td {
                color: white;
            }

            #tb1 tbody tr {
                background-color: white;
            }

            #tb1 td {
                padding: 5px 0;
            }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" Text="Button" />
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
    <table id="tb1">
                <thead>
                    <tr>
                        <td>ids</td>
                        <td>code</td>
                        <td>name</td>
                        <td>oil</td>
                        <td>powers</td>
                        <td>price</td>
                    </tr>
                </thead>
                <tbody>
                    <asp:Repeater ID="Repeater1" runat="server">
                        <ItemTemplate>

                            <tr>
                                <td><%#Eval("ids") %></td>
                                <td><%#Eval("code") %></td>
                                <td><%#Eval("name") %></td>
                                <td><%#Eval("oil") %></td>
                                <td><%#Eval("powers") %></td>
                                <td><%#Eval("price") %></td>
                            </tr>


                        </ItemTemplate>
                    </asp:Repeater>
                </tbody>
            </table>
    </div>
    </form>
</body>
</html>

后台代码：

模糊查询

　　全部模糊查询（Contains()）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;
        //页面绑定数据
        if (!IsPostBack)
        {
            using (DataClassesDataContext con = new DataClassesDataContext())
            {
                Repeater1.DataSource = con.car;
                Repeater1.DataBind();
            }
        }
    }

    private void Button1_Click(object sender, EventArgs e)
    {
        //全部模糊差
        string s = TextBox1.Text;//获取用户输入的内容
        
        using (DataClassesDataContext con = new DataClassesDataContext())
        {
            //car表里name列里全部（Contains（））带用户输入内容（s）的数据连接到  Repeater1
            Repeater1.DataSource = con.car.Where(r => r.name.Contains(s));
            Repeater1.DataBind();//绑定到  Repeater1上
            //car表里油耗大于7.4并且价格大于50的（类型不相同 一个是decimal？型和double型）
            Repeater1.DataSource = con.car.Where(r => r.oil>7.4m && r.price>50m);
            Repeater1.DataBind();//绑定到  Repeater1上
        }
    }
}

　　开头（StartsWith()）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;
        //页面绑定数据
        if (!IsPostBack)
        {
            using (DataClassesDataContext con = new DataClassesDataContext())
            {
                Repeater1.DataSource = con.car;
                Repeater1.DataBind();
            }
        }
    }

    private void Button1_Click(object sender, EventArgs e)
    {
        //开头模糊差
        string s = TextBox1.Text;//获取用户输入的内容
        
        using (DataClassesDataContext con = new DataClassesDataContext())
        {
            //car表里name列里开头（StartsWith（））带用户输入内容（s）的数据连接到  Repeater1
            Repeater1.DataSource = con.car.Where(r => r.name.StartsWith(s));
            Repeater1.DataBind();//绑定到  Repeater1上
        }
    }
}

　　结尾（EndsWith()）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;
        //页面绑定数据
        if (!IsPostBack)
        {
            using (DataClassesDataContext con = new DataClassesDataContext())
            {
                Repeater1.DataSource = con.car;
                Repeater1.DataBind();
            }
        }
    }

    private void Button1_Click(object sender, EventArgs e)
    {
        //结尾模糊差
        string s = TextBox1.Text;//获取用户输入的内容
        
        using (DataClassesDataContext con = new DataClassesDataContext())
        {
            //car表里name列里结尾（EndsWith（））带用户输入内容（s）的数据连接到  Repeater1
            Repeater1.DataSource = con.car.Where(r => r.name.EndsWith(s));
            Repeater1.DataBind();//绑定到  Repeater1上
        }
    }
}

个数：Count

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;
        //页面绑定数据
        if (!IsPostBack)
        {
            using (DataClassesDataContext con = new DataClassesDataContext())
            {
                Repeater1.DataSource = con.car;
                Repeater1.DataBind();
            }
        }
    }

    private void Button1_Click(object sender, EventArgs e)
    {
        
        string s = TextBox1.Text;//获取用户输入的内容

        using (DataClassesDataContext con = new DataClassesDataContext())
        {
   //查询一共多少条数据  (Lbel1需要的事string型 con.car.Count()是int型转换成string型)
            Label1.Text = con.car.Count().ToString();
            //或者
            Label1.Text = con.car.ToList().Count.ToString();
            //查询油耗大于7.5的一共多少条数据
            Label1.Text = con.car.Where(r => r.oil > 7.5m).Count().ToString();
        }

    }
}

最大值：Max(r => r.price)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;
        //页面绑定数据
        if (!IsPostBack)
        {
            using (DataClassesDataContext con = new DataClassesDataContext())
            {
                Repeater1.DataSource = con.car;
                Repeater1.DataBind();
            }
        }
    }

    private void Button1_Click(object sender, EventArgs e)
    {
      
        string s = TextBox1.Text;//获取用户输入的内容

        using (DataClassesDataContext con = new DataClassesDataContext())
        {
  //查询car表里价格列里最大的值(返回的是一个值不是一个对象)
            Label1.Text = con.car.Max(r => r.price).ToString();
        }
    }
}

最小值：Min(r => r.price)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;
        //页面绑定数据
        if (!IsPostBack)
        {
            using (DataClassesDataContext con = new DataClassesDataContext())
            {
                Repeater1.DataSource = con.car;
                Repeater1.DataBind();
            }
        }
    }

    private void Button1_Click(object sender, EventArgs e)
    {
       
        string s = TextBox1.Text;//获取用户输入的内容

        using (DataClassesDataContext con = new DataClassesDataContext())
        {
            //查询car表里价格列里最小的值(返回的是一个值不是一个对象)
            Label1.Text = con.car.Min(r => r.price).ToString();
        }
    }
}

平均值：Average(r => r.price)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;
        //页面绑定数据
        if (!IsPostBack)
        {
            using (DataClassesDataContext con = new DataClassesDataContext())
            {
                Repeater1.DataSource = con.car;
                Repeater1.DataBind();
            }
        }
    }

    private void Button1_Click(object sender, EventArgs e)
    {     
        string s = TextBox1.Text;//获取用户输入的内容

        using (DataClassesDataContext con = new DataClassesDataContext())
        {
            //查询car表里价格列里平均值(返回的是一个值不是一个对象)
            Label1.Text = con.car.Average(r => r.price).ToString();
        }
    }
}

求和：Sum(r => r.price)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;
        //页面绑定数据
        if (!IsPostBack)
        {
            using (DataClassesDataContext con = new DataClassesDataContext())
            {
                Repeater1.DataSource = con.car;
                Repeater1.DataBind();
            }
        }
    }

    private void Button1_Click(object sender, EventArgs e)
    {
       
        string s = TextBox1.Text;//获取用户输入的内容

        using (DataClassesDataContext con = new DataClassesDataContext())
        {
            //查询car表里价格列里求和(返回的是一个值不是一个对象)
            Label1.Text = con.car.Sum(r => r.price).ToString();
        }
    }
}

升序：OrderBy(r => r.price);

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;
        //页面绑定数据
        if (!IsPostBack)
        {
            using (DataClassesDataContext con = new DataClassesDataContext())
            {
                Repeater1.DataSource = con.car;
                Repeater1.DataBind();
            }
        }
    }

    private void Button1_Click(object sender, EventArgs e)
    {
        using (DataClassesDataContext con = new DataClassesDataContext())
        {
            //car表里Oil列里升序排序(返回的是一个值不是一个对象)
           Repeater1.DataSource= con.car.OrderBy(r => r.price);
            Repeater1.DataBind();
        }
    }
}

降序：OrderByDescending(r => r.price)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;
        //页面绑定数据
        if (!IsPostBack)
        {
            using (DataClassesDataContext con = new DataClassesDataContext())
            {
                Repeater1.DataSource = con.car;
                Repeater1.DataBind();
            }
        }
    }

    private void Button1_Click(object sender, EventArgs e)
    {
        using (DataClassesDataContext con = new DataClassesDataContext())
        {
            //car表里Oil列里降序排序(返回的是一个值不是一个对象)
           Repeater1.DataSource= con.car.OrderByDescending(r => r.price);
            Repeater1.DataBind();
        }
    }
}

查看全文

相关阅读:
基数排序
 kt-Mapper 笔记
 归并排序
 快速排序
 第十一天——递归（五）
第十天——闭包（一）
第八天——函数的嵌套以及gloabal、nonlocal（三）（重点：执行过程）
第八天——函数的作用域（二）
第八天——函数的动态参数（一）
第七天——函数的参数（二）

原文地址：https://www.cnblogs.com/skyhorseyk/p/Linq.html

Tingq 模糊查询 共多少条数据 最大、小、平均、求和值 升、降序

Tingq 模糊查询共多少条数据最大、小、平均、求和值升、降序