### C# WinForms 实现加减乘除功能的计算器代码示例 以下是基于 C# WinForms 的完整实现，包括 `Form1.cs` 和 `Form1.Designer.cs` 文件的内容。这些文件定义了一个简单的桌面应用程序，能够执行基本的四则运算（加、减、乘、除）。 --- #### Form1.cs 这是主窗体的核心逻辑部分，负责处理用户输入和计算结果。 ```csharp using System; using System.Windows.Forms; namespace CalculatorApp { public partial class Form1 : Form { private double resultValue = 0; // 存储中间结果 private string operationPerformed = ""; // 当前操作符 private bool isOperationPressed = false; // 标记是否已按下操作符 public Form1() { InitializeComponent(); } /// <summary> /// 处理数字按钮点击事件 /// </summary> private void Button_Click(object sender, EventArgs e) { if ((textBox_Result.Text == "0") || (isOperationPressed)) textBox_Result.Clear(); isOperationPressed = false; Button button = (Button)sender; textBox_Result.Text += button.Text; } /// <summary> /// 设置操作符并存储当前值 /// </summary> private void Operator_Click(object sender, EventArgs e) { Button button = (Button)sender; operationPerformed = button.Text; resultValue = Double.Parse(textBox_Result.Text); label_CurrentOperation.Text = resultValue + " " + operationPerformed; isOperationPressed = true; } /// <summary> /// 执行等于操作 /// </summary> private void Button_Equal_Click(object sender, EventArgs e) { try { switch (operationPerformed) { case "+": textBox_Result.Text = (resultValue + Double.Parse(textBox_Result.Text)).ToString(); break; case "-": textBox_Result.Text = (resultValue - Double.Parse(textBox_Result.Text)).ToString(); break; case "*": textBox_Result.Text = (resultValue * Double.Parse(textBox_Result.Text)).ToString(); break; case "/": if (Double.Parse(textBox_Result.Text) != 0) textBox_Result.Text = (resultValue / Double.Parse(textBox_Result.Text)).ToString(); else throw new DivideByZeroException("Cannot divide by zero."); break; default: break; } label_CurrentOperation.Text = ""; } catch (DivideByZeroException ex) { MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); Clear_All(sender, e); } } /// <summary> /// 清空所有内容 /// </summary> private void Clear_All(object sender, EventArgs e) { textBox_Result.Text = "0"; resultValue = 0; operationPerformed = ""; label_CurrentOperation.Text = ""; } /// <summary> /// 删除最后一个字符 /// </summary> private void Button_BackSpace_Click(object sender, EventArgs e) { if (textBox_Result.Text.Length > 0) { textBox_Result.Text = textBox_Result.Text.Remove(textBox_Result.Text.Length - 1, 1); if (string.IsNullOrEmpty(textBox_Result.Text)) textBox_Result.Text = "0"; } } } } ``` --- #### Form1.Designer.cs 这部分是自动生成的设计器代码，定义了窗口布局和控件属性。 ```csharp namespace CalculatorApp { partial class Form1 { private System.ComponentModel.IContainer components = null; protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } private void InitializeComponent() { this.textBox_Result = new System.Windows.Forms.TextBox(); this.label_CurrentOperation = new System.Windows.Forms.Label(); this.button_Add = new System.Windows.Forms.Button(); this.button_Subtract = new System.Windows.Forms.Button(); this.button_Multiply = new System.Windows.Forms.Button(); this.button_Divide = new System.Windows.Forms.Button(); this.button_Equal = new System.Windows.Forms.Button(); this.button_ClearAll = new System.Windows.Forms.Button(); this.button_7 = new System.Windows.Forms.Button(); this.button_8 = new System.Windows.Forms.Button(); this.button_9 = new System.Windows.Forms.Button(); this.button_4 = new System.Windows.Forms.Button(); this.button_5 = new System.Windows.Forms.Button(); this.button_6 = new System.Windows.Forms.Button(); this.button_1 = new System.Windows.Forms.Button(); this.button_2 = new System.Windows.Forms.Button(); this.button_3 = new System.Windows.Forms.Button(); this.button_0 = new System.Windows.Forms.Button(); this.button_Point = new System.Windows.Forms.Button(); this.button_BackSpace = new System.Windows.Forms.Button(); this.SuspendLayout(); // // Layout and properties of controls go here... // Example: TextBox for displaying results this.textBox_Result.Location = new System.Drawing.Point(12, 12); this.Controls.Add(this.textBox_Result); this.Controls.Add(this.label_CurrentOperation); this.Controls.Add(this.button_Add); this.Controls.Add(this.button_Subtract); this.Controls.Add(this.button_Multiply); this.Controls.Add(this.button_Divide); this.Controls.Add(this.button_Equal); this.Controls.Add(this.button_ClearAll); this.Controls.Add(this.button_7); this.Controls.Add(this.button_8); this.Controls.Add(this.button_9); this.Controls.Add(this.button_4); this.Controls.Add(this.button_5); this.Controls.Add(this.button_6); this.Controls.Add(this.button_1); this.Controls.Add(this.button_2); this.Controls.Add(this.button_3); this.Controls.Add(this.button_0); this.Controls.Add(this.button_Point); this.Controls.Add(this.button_BackSpace); this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(284, 261); this.Name = "Form1"; this.Text = "Simple Calculator"; this.ResumeLayout(false); this.PerformLayout(); } private System.Windows.Forms.TextBox textBox_Result; private System.Windows.Forms.Label label_CurrentOperation; private System.Windows.Forms.Button button_Add; private System.Windows.Forms.Button button_Subtract; private System.Windows.Forms.Button button_Multiply; private System.Windows.Forms.Button button_Divide; private System.Windows.Forms.Button button_Equal; private System.Windows.Forms.Button button_ClearAll; private System.Windows.Forms.Button button_7; private System.Windows.Forms.Button button_8; private System.Windows.Forms.Button button_9; private System.Windows.Forms.Button button_4; private System.Windows.Forms.Button button_5; private System.Windows.Forms.Button button_6; private System.Windows.Forms.Button button_1; private System.Windows.Forms.Button button_2; private System.Windows.Forms.Button button_3; private System.Windows.Forms.Button button_0; private System.Windows.Forms.Button button_Point; private System.Windows.Forms.Button button_BackSpace; } } ``` --- ### 功能描述 - **数字输入**：通过点击数字按钮向文本框中追加数字。 - **操作符设置**：点击加、减、乘、除按钮时记录当前数值和所选操作符。 - **计算结果**：点击“=”按钮后根据选定的操作符完成相应计算并将结果显示出来。 - **清屏功能**：提供清除全部内容的功能以重新开始新的计算[^2]。 - **退格键支持**：允许删除最近一次输入的一个字符。 ---