### C# WinForms 小型案例示例 以下是基于 C# 和 WinForms 的小型案例——一个简单的计算器应用程序。该程序展示了如何通过事件驱动编程来构建交互式界面。 #### 计算器功能描述 此计算器支持基本的加法、减法、乘法和除法操作，用户可以通过点击按钮输入数字并执行运算。 #### 示例代码 ```csharp using System; using System.Windows.Forms; namespace SimpleCalculator { public partial class CalculatorForm : Form { private double result = 0; private string operation = ""; private bool isOperationPressed = false; public CalculatorForm() { InitializeComponent(); } private void NumberButton_Click(object sender, EventArgs e) { if (resultLabel.Text == "0" || isOperationPressed) resultLabel.Text = String.Empty; Button button = (Button)sender; resultLabel.Text += button.Text; isOperationPressed = false; } private void OperationButton_Click(object sender, EventArgs e) { Button button = (Button)sender; operation = button.Text; result = Double.Parse(resultLabel.Text); isOperationPressed = true; } private void EqualsButton_Click(object sender, EventArgs e) { switch (operation) { case "+": resultLabel.Text = (result + Double.Parse(resultLabel.Text)).ToString(); break; case "-": resultLabel.Text = (result - Double.Parse(resultLabel.Text)).ToString(); break; case "*": resultLabel.Text = (result * Double.Parse(resultLabel.Text)).ToString(); break; case "/": resultLabel.Text = (result / Double.Parse(resultLabel.Text)).ToString(); break; default: break; } } private void ClearButton_Click(object sender, EventArgs e) { resultLabel.Text = "0"; result = 0; } private void InitializeControls() { this.Size = new System.Drawing.Size(280, 400); Label resultLabel = new Label { Text = "0", Location = new System.Drawing.Point(10, 10), Size = new System.Drawing.Size(250, 30), Font = new System.Drawing.Font("Arial", 16) }; Controls.Add(resultLabel); int[] numberButtons = { 7, 8, 9, 4, 5, 6, 1, 2, 3, 0 }; for (int i = 0; i < numberButtons.Length; i++) { Button btnNumber = new Button { Text = numberButtons[i].ToString(), Location = new System.Drawing.Point((i % 3) * 70 + 10, ((i / 3) +