using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Data;
using?System.Drawing;
using?System.Linq;
using?System.Text;
using?System.Windows.Forms;
using?System.Collections;

namespace?_201708
{
????public?partial?class?Form_Query?:?Form
????{
????????ArrayList?al?=?new?ArrayList（）;
????????public?Form_Query（ArrayList?arraylist）
????????{
????????????InitializeComponent（）;
????????????al?=?arraylist;
????????}

????????//查詢
????????private?void?btn_Query_Click（object?sender?EventArgs?e）
????????{
????????????double?xmin?=?0;
????????????double?xmax?=?0;
????????????if?（（this.txt_Max.Text?!=?null）?&&?（this.txt_Min.Text?!=?““））
????????????{
????????????????xmin?=?Convert.ToDouble（this.txt_Min.Text）;
????????????????xmax?=?Convert.ToDouble（this.txt_Max.Text）;

????????????????for?（int?i?=?0;?i?????????????????{
????????????????????Point2D?point?=?（Point2D）al[i];
????????????????????int?id?=?point.id;
????????????????????double?x?=?point.x;
????????????????????double?y?=?point.y;
????????????????????if?（x?>=?xmin?&&?x?<=?xmax）
????????????????????{
????????????????????????this.txt_Result.Text?+=?“點號=“?+?id?+?“x=“?+?x?+?“y=“?+?y?+?“\r\n“;
????????????????????}
????????????????}
????????????????if?（this.txt_Result.Text?==?““）
????????????????{
????????????????????MessageBox.Show（“沒有符合條件的數據啊！！！“）;
????????????????}
????????????}
????????????else
????????????{
????????????????MessageBox.Show（“請輸入范圍！！！“）;
????????????}????????????
????????}




















????????//拓展：查詢結果顯示在dataGridView中
????????private?void?btn_Query2_Click（object?sender?EventArgs?e）
????????{
????????????double?xmin?=?0;
????????????double?xmax?=?0;
????????????if?（（this.txt_Max.Text!=null）?&&?（this.txt_Min.Text!=““））
????????????{
????????????????xmin?=?Convert.ToDouble（this.txt_Min.Text）;
????????????????xmax?=?Convert.ToDouble（this.txt_Max.Text）;

????????????????DataTable?dt?=?new?DataTable（）;
????????????????dt.Columns.Add（“id“?typeof（int））;
????????????????dt.Columns.Add（“x“?typeof（double））;
????????????????dt.Columns.Add（“y“?typeof（double））;


????????????????for?（int?i?=?0;?i?????????????????{
????????????????????Point2D?point?=?（Point2D）al[i];
????????????????????int?id?=?point.id;
????????????????????double?x?=?point.x;
????????????????????double?y?=?point.y;
????????????????????if?（x?>=?xmin?&&?x?<=?xmax）
????????????????????{
????????????????????????DataRow?dr?=?dt.NewRow（）;
????????????????????????dr[0]?=?id;
????????????????????????dr[1]?=?x;
????????????????????????dr[2]?=?y;
????????????????????????dt.Rows.Add（dr）;
????????????????????}
????????????????}
????????????????this.dataGridView1.DataSource?=?dt;
????????????????if?（dt.Rows.Count?==?0）
????????????????{
????????????????????this.dataGridView1.DataSource?=?null;
????????????????????MessageBox.Show（“沒有符合條件的數據啊！！！“）;
??????????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????68232??2017-07-31?10:59??txt文件和DataGridView控件的操作等\1、窗體_meitu_1.jpg

?????文件??????18432??2017-07-31?10:56??txt文件和DataGridView控件的操作等\201708C#基礎\201708\bin\Debug\201708.exe

?????文件??????44544??2017-07-31?10:56??txt文件和DataGridView控件的操作等\201708C#基礎\201708\bin\Debug\201708.pdb

?????文件??????11600??2017-07-31?10:57??txt文件和DataGridView控件的操作等\201708C#基礎\201708\bin\Debug\201708.vshost.exe

?????文件????????490??2015-07-10?19:01??txt文件和DataGridView控件的操作等\201708C#基礎\201708\bin\Debug\201708.vshost.exe.manifest

?????文件???????3262??2017-07-31?10:51??txt文件和DataGridView控件的操作等\201708C#基礎\201708\Form_Query.cs

?????文件???????6199??2017-07-31?10:51??txt文件和DataGridView控件的操作等\201708C#基礎\201708\Form_Query.Designer.cs

?????文件???????5817??2017-07-31?10:51??txt文件和DataGridView控件的操作等\201708C#基礎\201708\Form_Query.resx

?????文件???????8931??2017-07-31?10:54??txt文件和DataGridView控件的操作等\201708C#基礎\201708\MainForm.cs

?????文件???????9801??2017-07-31?10:54??txt文件和DataGridView控件的操作等\201708C#基礎\201708\MainForm.Designer.cs

?????文件???????5817??2017-07-31?10:54??txt文件和DataGridView控件的操作等\201708C#基礎\201708\MainForm.resx

?????文件????????888??2017-07-28?14:46??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\201708.csproj.FileListAbsolute.txt

?????文件???????1041??2017-07-28?14:43??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\201708.csproj.GenerateResource.Cache

?????文件???????9214??2017-07-28?10:47??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\201708.csprojResolveAssemblyReference.cache

?????文件??????18432??2017-07-31?10:56??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\201708.exe

?????文件??????44544??2017-07-31?10:56??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\201708.pdb

?????文件???????1040??2017-07-31?10:53??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\201708基礎.csproj.FileListAbsolute.txt

?????文件???????1041??2017-07-31?10:07??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\201708基礎.csproj.GenerateResource.Cache

?????文件???????9214??2017-07-28?14:46??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\201708基礎.csprojResolveAssemblyReference.cache

?????文件???????5420??2017-07-28?10:45??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache

?????文件???????6444??2017-07-31?10:56??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache

?????文件????????990??2017-07-31?10:57??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\txt文件和DataGridViewView.csproj.FileListAbsolute.txt

?????文件???????1041??2017-07-31?10:56??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\txt文件和DataGridViewView.csproj.GenerateResource.Cache

?????文件????????180??2017-07-31?10:56??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\_201708.Form_Query.resources

?????文件????????180??2017-07-31?10:56??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\_201708.MainForm.resources

?????文件????????180??2017-07-28?12:18??txt文件和DataGridView控件的操作等\201708C#基礎\201708\obj\x86\Debug\_201708.Properties.Resources.resources

?????文件????????491??2017-07-27?20:55??txt文件和DataGridView控件的操作等\201708C#基礎\201708\Program.cs

?????文件???????1344??2017-07-27?20:55??txt文件和DataGridView控件的操作等\201708C#基礎\201708\Properties\AssemblyInfo.cs

?????文件???????2866??2017-07-27?20:55??txt文件和DataGridView控件的操作等\201708C#基礎\201708\Properties\Resources.Designer.cs

?????文件???????5612??2017-07-27?20:55??txt文件和DataGridView控件的操作等\201708C#基礎\201708\Properties\Resources.resx

............此處省略24個文件信息