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C# 在LINQ to DataSet中对分组操作执行子查询
C# 在LINQ to DataSet中对分组操作执行子查询,相关代码：
private void button1_Click(object sender, EventArgs e)
{//在LINQ to DataSet中对分组操作执行子查询
SqlConnection MyConnection = new SqlConnection();
MyConnection.ConnectionString = @"Data Source =.SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=True";
MyConnection.Open();
SqlCommand MyCommand = new SqlCommand("Select * From Orders ", MyConnection);
DataSet MySet = new DataSet();
SqlDataAdapter MyAdapter = new SqlDataAdapter(MyCommand);
MyAdapter.Fill(MySet);
DataTable MyQueryTable = MySet.Tables[0];
var MyQuery = from MyOrder in MyQueryTable.AsEnumerable()
orderby MyOrder.Field("ShipCity")
group MyOrder by MyOrder.Field("ShipCity") into g
select new
{
MyCity = g.Key,
MyMaxFreight = (from MyData in g select MyData.Field("Freight")).Max()
- 2022-01-27 20:20:32下载
- 积分：1
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Desktop
Cohen-Sutherland Line Clipping algorithm
- 2010-04-11 23:47:42下载
- 积分：1
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main_waws01-qingdao
通过AR模型模拟得到风荷载，其模拟是有davenport风速谱得到的(Wind load is obtained by AR model simulation, which is based on Davenport wind speed spectrum.)
- 2018-12-05 20:31:23下载
- 积分：1
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zhebanchazhao
实现折半查找，非递归形式，从而实现数据结构所要的结果。(To achieve binary search, the non-recursive form)
- 2012-08-29 12:35:25下载
- 积分：1
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PWM
可调PWM波,能够根据根据参数调整PWM的输出(需要改进)(Adjustable PWM wave, according to the PWM output parameter adjustment (improvement))
- 2013-03-29 16:30:33下载
- 积分：1
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r7f0c809_portable_battery
说明： 基于r7f0c809单片机的便携式电源，可以给手机等消费电子产品充电，具有过电流、过电压、过温保护功能。(The portable power supply based on r7f0c809 MCU can charge mobile phones and other consumer electronic products, and has the functions of over-current, over-voltage and over-temperature protection.)
- 2020-06-21 17:20:01下载
- 积分：1
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NET basic
说明： 小白学习过程,从最基础的内容开始一直到面向对象的类的学习 (目前)(study c# Xiaobai learning process, from the most basic content to the object-oriented class learning (at present))
- 2020-06-16 11:40:01下载
- 积分：1
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KML-Graphics
KML文件图形化显示，使用此插件，必须安装GOOLE EARTH才能正确使用(KML files, graphical display, use this plugin, you must install the GOOLE EARTH to use)
- 2013-12-25 08:37:32下载
- 积分：1
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MultiProcDownLoadfiles
多线程下载文件，非常好的示例 多线程下载文件，非常好的示例(MultiProcess Down load file , very good sample)
- 2016-12-31 15:18:57下载
- 积分：1
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ZigBee温度采集全代码，包含各层的介绍有NWKMACAPL
ZigBee温度采集全代码，包含各层的介绍有NWKMACAPL
- 2022-03-20 10:20:26下载
- 积分：1
