整理教材示例：项目 1 任务 2、项目 4 任务 1 和 3、项目 5 任务 1

- 界面取自配套参考工程，用设计器引擎按书上表格改控件名（label1 → lbl_port 等），
  去掉 BOM、换行统一为 LF；代码按书整理，修正 boolIsOpen 等印刷错误
- 测试：所有示例都能编译（10 个），以及计算器 / 多态、红外对射、报警灯、火焰的行为测试

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

samples/p1-t2-面向对象特性/American.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace C_基础
+{
+    class American : People//继承People类
+    {
+        public override void Speak(System.Windows.Forms.TextBox Txtbox, string name)//重写父类中的虚方法
+        {
+            base.Speak(Txtbox, name+"说的是英语！\r\n");
+        }
+    }
+}

samples/p1-t2-面向对象特性/Chinese.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace C_基础
+{
+    class Chinese:People//继承People类
+    {
+        public override void Speak(System.Windows.Forms.TextBox Txtbox, string name)//重写父类中的虚方法
+        {
+            base.Speak(Txtbox, name+"说的是汉语！\r\n");
+        }
+    }
+}

samples/p1-t2-面向对象特性/Form1.Designer.cs

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+namespace C_基础
+{
+    partial class Form1
+    {
+        /// <summary>
+        /// 必需的设计器变量。
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        /// 清理所有正在使用的资源。
+        /// </summary>
+        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows 窗体设计器生成的代码
+
+        /// <summary>
+        /// 设计器支持所需的方法 - 不要
+        /// 使用代码编辑器修改此方法的内容。
+        /// </summary>
+        private void InitializeComponent()
+        {
+            this.groupBox1 = new System.Windows.Forms.GroupBox();
+            this.btnCalculate = new System.Windows.Forms.Button();
+            this.txtResult = new System.Windows.Forms.TextBox();
+            this.cmboxType = new System.Windows.Forms.ComboBox();
+            this.txtNum2 = new System.Windows.Forms.TextBox();
+            this.txtNum1 = new System.Windows.Forms.TextBox();
+            this.groupBox2 = new System.Windows.Forms.GroupBox();
+            this.txtDispaly = new System.Windows.Forms.TextBox();
+            this.btnDisplay = new System.Windows.Forms.Button();
+            this.groupBox1.SuspendLayout();
+            this.groupBox2.SuspendLayout();
+            this.SuspendLayout();
+            // 
+            // groupBox1
+            // 
+            this.groupBox1.Controls.Add(this.btnCalculate);
+            this.groupBox1.Controls.Add(this.txtResult);
+            this.groupBox1.Controls.Add(this.cmboxType);
+            this.groupBox1.Controls.Add(this.txtNum2);
+            this.groupBox1.Controls.Add(this.txtNum1);
+            this.groupBox1.Location = new System.Drawing.Point(21, 12);
+            this.groupBox1.Name = "groupBox1";
+            this.groupBox1.Size = new System.Drawing.Size(516, 80);
+            this.groupBox1.TabIndex = 0;
+            this.groupBox1.TabStop = false;
+            this.groupBox1.Text = "简易计算器";
+            // 
+            // btnCalculate
+            // 
+            this.btnCalculate.Location = new System.Drawing.Point(325, 31);
+            this.btnCalculate.Name = "btnCalculate";
+            this.btnCalculate.Size = new System.Drawing.Size(49, 23);
+            this.btnCalculate.TabIndex = 5;
+            this.btnCalculate.Text = "=";
+            this.btnCalculate.UseVisualStyleBackColor = true;
+            this.btnCalculate.Click += new System.EventHandler(this.btnCalculate_Click);
+            // 
+            // txtResult
+            // 
+            this.txtResult.Location = new System.Drawing.Point(390, 31);
+            this.txtResult.Name = "txtResult";
+            this.txtResult.ReadOnly = true;
+            this.txtResult.Size = new System.Drawing.Size(100, 21);
+            this.txtResult.TabIndex = 4;
+            // 
+            // cmboxType
+            // 
+            this.cmboxType.FormattingEnabled = true;
+            this.cmboxType.Items.AddRange(new object[] {
+            "+",
+            "-",
+            "*",
+            "/"});
+            this.cmboxType.Location = new System.Drawing.Point(112, 31);
+            this.cmboxType.Name = "cmboxType";
+            this.cmboxType.Size = new System.Drawing.Size(64, 20);
+            this.cmboxType.TabIndex = 2;
+            // 
+            // txtNum2
+            // 
+            this.txtNum2.Location = new System.Drawing.Point(195, 31);
+            this.txtNum2.Name = "txtNum2";
+            this.txtNum2.Size = new System.Drawing.Size(100, 21);
+            this.txtNum2.TabIndex = 1;
+            // 
+            // txtNum1
+            // 
+            this.txtNum1.Location = new System.Drawing.Point(6, 31);
+            this.txtNum1.Name = "txtNum1";
+            this.txtNum1.Size = new System.Drawing.Size(100, 21);
+            this.txtNum1.TabIndex = 0;
+            // 
+            // groupBox2
+            // 
+            this.groupBox2.Controls.Add(this.txtDispaly);
+            this.groupBox2.Controls.Add(this.btnDisplay);
+            this.groupBox2.Location = new System.Drawing.Point(21, 98);
+            this.groupBox2.Name = "groupBox2";
+            this.groupBox2.Size = new System.Drawing.Size(516, 116);
+            this.groupBox2.TabIndex = 1;
+            this.groupBox2.TabStop = false;
+            this.groupBox2.Text = "类的多态性";
+            // 
+            // txtDispaly
+            // 
+            this.txtDispaly.Location = new System.Drawing.Point(46, 20);
+            this.txtDispaly.Multiline = true;
+            this.txtDispaly.Name = "txtDispaly";
+            this.txtDispaly.Size = new System.Drawing.Size(249, 82);
+            this.txtDispaly.TabIndex = 1;
+            // 
+            // btnDisplay
+            // 
+            this.btnDisplay.Location = new System.Drawing.Point(344, 45);
+            this.btnDisplay.Name = "btnDisplay";
+            this.btnDisplay.Size = new System.Drawing.Size(75, 23);
+            this.btnDisplay.TabIndex = 0;
+            this.btnDisplay.Text = "显示";
+            this.btnDisplay.UseVisualStyleBackColor = true;
+            this.btnDisplay.Click += new System.EventHandler(this.btnDisplay_Click);
+            // 
+            // Form1
+            // 
+            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.ClientSize = new System.Drawing.Size(549, 226);
+            this.Controls.Add(this.groupBox2);
+            this.Controls.Add(this.groupBox1);
+            this.Name = "Form1";
+            this.Text = "C#入门基础";
+            this.groupBox1.ResumeLayout(false);
+            this.groupBox1.PerformLayout();
+            this.groupBox2.ResumeLayout(false);
+            this.groupBox2.PerformLayout();
+            this.ResumeLayout(false);
+
+        }
+
+        #endregion
+
+        private System.Windows.Forms.GroupBox groupBox1;
+        private System.Windows.Forms.TextBox txtResult;
+        private System.Windows.Forms.ComboBox cmboxType;
+        private System.Windows.Forms.TextBox txtNum2;
+        private System.Windows.Forms.TextBox txtNum1;
+        private System.Windows.Forms.Button btnCalculate;
+        private System.Windows.Forms.GroupBox groupBox2;
+        private System.Windows.Forms.TextBox txtDispaly;
+        private System.Windows.Forms.Button btnDisplay;
+    }
+}
+

samples/p1-t2-面向对象特性/Form1.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace C_基础
+{
+    public partial class Form1 : Form
+    {
+        public Form1()
+        {
+            InitializeComponent();
+        }
+
+        private void btnCalculate_Click(object sender, EventArgs e)
+        {
+            if(txtNum1.Text.Trim()!=""&&txtNum2.Text.Trim()!="")
+            {
+                float a, b;
+                a = float.Parse(txtNum1.Text);//字符串转化为float
+                b = float.Parse(txtNum2.Text);//字符串转化为float
+                float res = (float)Result(a, b, cmboxType.Text);//两数进行装箱，调用计算函数，返回值进行拆箱
+                txtResult.Text = res.ToString();//将返回值显示到界面上
+            }
+        }
+         public Object Result(Object a,Object b,String type)//计算结果，使用拆箱装箱方式
+        {
+             float result=0;
+             float a1,b1;
+             a1=(float)a;//拆箱
+             b1=(float)b;//拆箱
+             switch(type)
+             {
+                 case "+": result = a1 + b1; break;//计算两个数的和
+                 case "-": result = a1 - b1; break;//计算两个数的差
+                 case "*": result = a1 * b1; break;//计算两个数的积
+                 case "/": result = a1 / b1; break;//计算两个数的商
+                 default: result=0;break;//默认值
+             }
+             return (Object)result;//装箱
+        }
+
+         private void btnDisplay_Click(object sender, EventArgs e)
+         {
+             People pleTemp;//定义People临时存储变量
+             Dictionary<int, string> dicName = new Dictionary<int, string>();//定义Dictionary字典类型，用于存储姓名与序号
+             dicName.Add(1, "张三");//向字典中添加数据
+             dicName.Add(2, "李四");
+             dicName.Add(3, "Mary");
+             dicName.Add(4, "Jimmy");
+             List<People> peoplelist = new List<People>();//定义People的List泛型数据
+             for (int i = 0; i < 2; i++)//添加两个中国人
+             {
+                 pleTemp = new Chinese();//实例化中国人
+                 peoplelist.Add(pleTemp);
+             }
+             for (int i = 0; i < 2; i++)//添加两个美国人
+             {
+                 pleTemp = new American();//实例化美国人
+                 peoplelist.Add(pleTemp);
+             }
+             for (int i = 0; i < peoplelist.Count; i++)//遍历List
+             {
+                 peoplelist[i].Speak(this.txtDispaly, dicName[i + 1]);//执行派生类重写的方法
+             }
+         }
+    }
+}

samples/p1-t2-面向对象特性/People.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace C_基础
+{
+    class People//定义一个父类People
+    {
+        public virtual void Speak(TextBox Txtbox,string name)//定义一个虚方法，用来表示人类的说话语言
+        {
+            Txtbox.Text += name;//向控件中输出名字
+        }
+    }
+}

samples/p1-t2-面向对象特性/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace C_基础
+{
+    static class Program
+    {
+        /// <summary>
+        /// 应用程序的主入口点。
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new Form1());
+        }
+    }
+}

samples/p1-t2-面向对象特性/meta.json

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+{
+  "title": "项目1 任务2 C#面向对象特性（计算器、多态）",
+  "source": "教材书 p13–16，界面取自配套参考工程，控件名和窗体标题按书修改（BtnCalculate → btnCalculate）"
+}