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tools/Calculator.cs

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+using System;
+
+namespace AppStore
+{
+    /// <summary>
+    /// 提供基本数学运算功能的工具类
+    /// </summary>
+    public static class Calculator
+    {
+        /// <summary>
+        /// 加法运算
+        /// </summary>
+        public static double Add(double a, double b) => a + b;
+
+        /// <summary>
+        /// 减法运算
+        /// </summary>
+        public static double Subtract(double a, double b) => a - b;
+
+        /// <summary>
+        /// 乘法运算
+        /// </summary>
+        public static double Multiply(double a, double b) => a * b;
+
+        /// <summary>
+        /// 除法运算
+        /// </summary>
+        public static double Divide(double a, double b)
+        {
+            if (b == 0) throw new DivideByZeroException("除数不能为零");
+            return a / b;
+        }
+    }
+}

tools/CalculatorForm.cs

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+using System;
+using System.Drawing;
+using System.Windows.Forms;
+using AppStore;
+
+namespace AppStore
+{
+    public class CalculatorForm : Form
+    {
+        private TextBox display = new TextBox();
+        private double firstNumber = 0;
+        private string operation = "";
+        
+        public CalculatorForm()
+        {
+            this.Text = "计算器";
+            this.Size = new Size(300, 400);
+            this.StartPosition = FormStartPosition.CenterScreen;
+            CreateControls();
+        }
+
+        private void CreateControls()
+        {
+            // 显示框
+            display = new TextBox();
+            display.ReadOnly = true;
+            display.TextAlign = HorizontalAlignment.Right;
+            display.Font = new Font("Microsoft YaHei", 14);
+            display.Size = new Size(260, 40);
+            display.Location = new Point(20, 20);
+            this.Controls.Add(display);
+
+            // 按钮布局
+            string[] buttonLabels = {
+                "7", "8", "9", "/",
+                "4", "5", "6", "*", 
+                "1", "2", "3", "-",
+                "0", ".", "=", "+"
+            };
+
+            for (int i = 0; i < buttonLabels.Length; i++)
+            {
+                var btn = new Button();
+                btn.Text = buttonLabels[i];
+                btn.Size = new Size(60, 50);
+                btn.Location = new Point(20 + (i % 4) * 65, 70 + (i / 4) * 55);
+                btn.Font = new Font("Microsoft YaHei", 12);
+                btn.Click += ButtonClickHandler;
+                this.Controls.Add(btn);
+            }
+
+            // 清除按钮
+            var clearBtn = new Button();
+            clearBtn.Text = "C";
+            clearBtn.Size = new Size(260, 40);
+            clearBtn.Location = new Point(20, 300);
+            clearBtn.Font = new Font("Microsoft YaHei", 12);
+            clearBtn.Click += (s, e) => {
+                display.Text = "";
+                firstNumber = 0;
+                operation = "";
+            };
+            this.Controls.Add(clearBtn);
+        }
+
+        private void ButtonClickHandler(object sender, EventArgs e)
+        {
+            var button = sender as Button;
+            if (button == null) return;
+
+            switch (button.Text)
+            {
+                case "+":
+                case "-":
+                case "*":
+                case "/":
+                    if (!string.IsNullOrEmpty(display.Text))
+                    {
+                        firstNumber = double.Parse(display.Text);
+                        operation = button.Text;
+                        display.Text = "";
+                    }
+                    break;
+                    
+                case "=":
+                    if (!string.IsNullOrEmpty(operation) && !string.IsNullOrEmpty(display.Text))
+                    {
+                        double secondNumber = double.Parse(display.Text);
+                        double result = 0;
+                        
+                        try
+                        {
+                            result = operation switch
+                            {
+                                "+" => AppStore.Calculator.Add(firstNumber, secondNumber),
+                                "-" => AppStore.Calculator.Subtract(firstNumber, secondNumber),
+                                "*" => AppStore.Calculator.Multiply(firstNumber, secondNumber),
+                                "/" => AppStore.Calculator.Divide(firstNumber, secondNumber),
+                                _ => 0
+                            };
+                            
+                            display.Text = result.ToString();
+                        }
+                        catch (DivideByZeroException)
+                        {
+                            MessageBox.Show("除数不能为零", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                        }
+                        operation = "";
+                    }
+                    break;
+                    
+                default:
+                    display.Text += button.Text;
+                    break;
+            }
+        }
+    }
+}

tools/CalculatorToolCard.cs

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+using System;
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace AppStore
+{
+    public class CalculatorToolCard : ToolCard
+    {
+        public CalculatorToolCard()
+        {
+            ToolName = "计算器";
+            try 
+            {
+                string iconPath = Path.Combine(Application.StartupPath, "img", "resource", "png", "Calculator.png");
+                if (File.Exists(iconPath))
+                {
+                    ToolIcon = Image.FromFile(iconPath);
+                }
+                else
+                {
+                    ToolIcon = SystemIcons.Application.ToBitmap();
+                }
+            }
+            catch
+            {
+                ToolIcon = SystemIcons.Application.ToBitmap();
+            }
+            this.ToolCardClicked += OnCalculatorCardClicked;
+            UpdateDisplay();
+        }
+
+        private void OnCalculatorCardClicked(object sender, EventArgs e)
+        {
+            var calculatorForm = new CalculatorForm();
+            calculatorForm.ShowDialog();
+        }
+    }
+}