目录
一、用正则表达式判断输入是否符合货币格式
二、用double.TryParse()判断输入是否符合货币格式
一、用正则表达式判断输入是否符合货币格式
// 判断输入是否货币合格
using System.Text.RegularExpressions;
namespace IsCurrency_Format
{partial class Program{static void Main(string[] args){ArgumentNullException.ThrowIfNull(args);Console.WriteLine("请输入要判断的字符串（货币格式）");string input = Console.ReadLine()!.ToString();bool isValidFormat = IsCurrencyFormat(input);if (isValidFormat){Console.WriteLine("该字符串是有效的货币格式！");}else{Console.WriteLine("该字符串不是有效的货币格式！");} Console.ReadKey();// 等待按任意键结束程序}static bool IsCurrencyFormat(string input){Regex regex = MyRegex();return regex.IsMatch(input);}[GeneratedRegex(@"^[+-]?\d+(,\d{3})*(\.\d{1,2})?$")]private static partial Regex MyRegex();}
}
//运行结果：
/*
请输入要判断的字符串（货币格式）
88888.88
该字符串是有效的货币格式！*/二、用double.TryParse()判断输入是否符合货币格式
//判断输入是否符合货币格式
using System.Globalization;
namespace _051
{public partial class Form1 : Form{private GroupBox? groupBox1;private Button? button1;private TextBox? textBox2;private TextBox? textBox1;private Label? label2;private Label? label1;public Form1(){InitializeComponent();Load += Form1_Load;}private void Form1_Load(object? sender, EventArgs e){// // button1// button1 = new Button{Location = new Point(209, 65),Name = "button1",Size = new Size(75, 23),TabIndex = 4,Text = "判断",UseVisualStyleBackColor = true};button1.Click += Button1_Click;// // textBox2// textBox2 = new TextBox{Location = new Point(77, 65),Name = "textBox2",Size = new Size(126, 23),TabIndex = 3};// // textBox1// textBox1 = new TextBox{Location = new Point(77, 27),Name = "textBox1",Size = new Size(126, 23),TabIndex = 2};// // label2// label2 = new Label{AutoSize = true,Location = new Point(6, 71),Name = "label2",Size = new Size(68, 17),TabIndex = 1,Text = "转换结果："};// // label1// label1 = new Label{AutoSize = true,Location = new Point(6, 30),Name = "label1",Size = new Size(68, 17),TabIndex = 0,Text = "输入金额："};// // groupBox1// groupBox1 = new GroupBox{Location = new Point(12, 12),Name = "groupBox1",Size = new Size(290, 117),TabIndex = 0,TabStop = false,Text = "是否符合货币格式"};groupBox1.Controls.Add(button1);groupBox1.Controls.Add(textBox2);groupBox1.Controls.Add(textBox1);groupBox1.Controls.Add(label2);groupBox1.Controls.Add(label1);groupBox1.SuspendLayout();// // Form1// AutoScaleDimensions = new SizeF(7F, 17F);AutoScaleMode = AutoScaleMode.Font;ClientSize = new Size(314, 141);Controls.Add(groupBox1);Name = "Form1";StartPosition = FormStartPosition.CenterScreen;Text = "判断是否符合货币格式";groupBox1.ResumeLayout(false);groupBox1.PerformLayout();}private void Button1_Click(object? sender, EventArgs e){if (double.TryParse(textBox1!.Text, out double temp)) //验证输入是否正确并赋值{NumberFormatInfo GN =new CultureInfo("zh-CN", false).NumberFormat;//实例化NumberFormatInfo对象GN.CurrencyGroupSeparator = ","; //设置货币值中用来分组的字符串textBox2!.Text = temp.ToString("C", GN);//格式化为货币格式并显示}else{MessageBox.Show("请输入正确的货币值！", "提示！");}}}
}
