界面

image.png

代码

using System;
using System.Windows.Forms;namespace CaseConverterTool
{public partial class Form1 : Form{public Form1(){InitializeComponent();InitializeUI();}private void InitializeUI(){// 设置窗口标题和大小this.Text = "英文字母大小写转换工具";this.Size = new System.Drawing.Size(600, 400);this.StartPosition = FormStartPosition.CenterScreen;// 创建输入标签Label inputLabel = new Label();inputLabel.Text = "请输入需要转换的文本:";inputLabel.Location = new System.Drawing.Point(20, 20);inputLabel.AutoSize = true;this.Controls.Add(inputLabel);// 创建输入文本框TextBox inputTextBox = new TextBox();inputTextBox.Multiline = true;inputTextBox.ScrollBars = ScrollBars.Vertical;inputTextBox.Location = new System.Drawing.Point(20, 45);inputTextBox.Size = new System.Drawing.Size(540, 100);inputTextBox.Name = "inputTextBox";this.Controls.Add(inputTextBox);// 创建按钮面板Panel buttonPanel = new Panel();buttonPanel.Location = new System.Drawing.Point(20, 160);buttonPanel.Size = new System.Drawing.Size(540, 40);buttonPanel.Name = "buttonPanel";this.Controls.Add(buttonPanel);// 创建转大写按钮Button toUpperButton = new Button();toUpperButton.Text = "转大写";toUpperButton.Location = new System.Drawing.Point(10, 5);toUpperButton.Size = new System.Drawing.Size(120, 30);toUpperButton.Name = "toUpperButton";toUpperButton.Click += (sender, e) => {if (this.Controls["inputTextBox"] is TextBox input && this.Controls["outputTextBox"] is TextBox output){output.Text = input.Text.ToUpper();}};buttonPanel.Controls.Add(toUpperButton);// 创建转小写按钮Button toLowerButton = new Button();toLowerButton.Text = "转小写";toLowerButton.Location = new System.Drawing.Point(150, 5);toLowerButton.Size = new System.Drawing.Size(120, 30);toLowerButton.Name = "toLowerButton";toLowerButton.Click += (sender, e) => {if (this.Controls["inputTextBox"] is TextBox input && this.Controls["outputTextBox"] is TextBox output){output.Text = input.Text.ToLower();}};buttonPanel.Controls.Add(toLowerButton);// 创建大小写互换按钮Button swapCaseButton = new Button();swapCaseButton.Text = "大小写互换";swapCaseButton.Location = new System.Drawing.Point(290, 5);swapCaseButton.Size = new System.Drawing.Size(120, 30);swapCaseButton.Name = "swapCaseButton";swapCaseButton.Click += (sender, e) => {if (this.Controls["inputTextBox"] is TextBox input && this.Controls["outputTextBox"] is TextBox output){output.Text = SwapCase(input.Text);}};buttonPanel.Controls.Add(swapCaseButton);// 创建复制结果按钮Button copyButton = new Button();copyButton.Text = "复制结果";copyButton.Location = new System.Drawing.Point(430, 5);copyButton.Size = new System.Drawing.Size(100, 30);copyButton.Name = "copyButton";copyButton.Click += (sender, e) => {if (this.Controls["outputTextBox"] is TextBox output && !string.IsNullOrEmpty(output.Text)){Clipboard.SetText(output.Text);MessageBox.Show("已复制到剪贴板！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);}};buttonPanel.Controls.Add(copyButton);// 创建输出标签Label outputLabel = new Label();outputLabel.Text = "转换结果:";outputLabel.Location = new System.Drawing.Point(20, 210);outputLabel.AutoSize = true;this.Controls.Add(outputLabel);// 创建输出文本框TextBox outputTextBox = new TextBox();outputTextBox.Multiline = true;outputTextBox.ScrollBars = ScrollBars.Vertical;outputTextBox.Location = new System.Drawing.Point(20, 235);outputTextBox.Size = new System.Drawing.Size(540, 100);outputTextBox.Name = "outputTextBox";outputTextBox.ReadOnly = true;this.Controls.Add(outputTextBox);}/// <summary>/// 实现大小写互换功能/// </summary>private string SwapCase(string input){char[] chars = input.ToCharArray();for (int i = 0; i < chars.Length; i++){if (char.IsUpper(chars[i])){chars[i] = char.ToLower(chars[i]);}else if (char.IsLower(chars[i])){chars[i] = char.ToUpper(chars[i]);}// 非字母字符不做处理}return new string(chars);}}
}