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!");
}
}
}
}