c#将字符串转换为大写或小写
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace 将字符串转换为大写小写
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
label1.Text = "输入字符串";
label2.Text = "转换后的字符串";
button1.Text = "确认转换";
radioButton1.Text = "大写";
radioButton2.Text = "小写";
radioButton1.Checked = true;
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text == " ") //判断文本框是否为空
{
MessageBox.Show("请输入字符串");
}
if(radioButton1.Checked==true)
{
textBox2.Text = textBox1.Text.ToUpper(); //ToUpper()方法将小写字母转换成大写字母
}
else
{
textBox2.Text = textBox1.Text.ToLower(); //ToUpper()方法将大写字母转换成小写字母
}
}
private void textBox1_KeyPress(object sender, KeyPressEventArgs e) //用到了textbox的keypress事件，用来判断输入的是否为想要的字母，如果不是，将禁止输入
{
if ((e.KeyChar >= '1' && e.KeyChar <= '9' )||( e.KeyChar >= 'a' && e.KeyChar <= 'z' )|| (e.KeyChar >= 'A' && e.KeyChar <= 'Z'))
{
e.Handled = false; //e.handled=false表示没有处理过，同意输入
}
else
{
e.Handled = true; //e.handled=false表示处理过了，禁止输入
}
}
}
}
运行结果
c#大小写转换合集
private static readonly String cnNumber = "零壹贰叁肆伍陆柒捌玖"; private static readonly String cnUnit = "分角元拾佰仟万拾佰仟亿拾佰仟兆拾佰仟";
1.在代码中以 Excel 加日期的算法
////// 传入原日期和所加月数，按照excel加月数算法，返回新日期 /// Excel计算方式和C#的计算方式不一致 /// C#的计算方式：若新日期超出了此月的最大日期数，比如9月31日，新日期为该月的最后一天9月30日 /// Excel的算法： 若新日期超出了此月的最大日期数，比如9月31日，新日期为该月最后一日延后超出的天数即是10月1日 /// /// 原日期 /// 所加的月数 ///新的日期 public static DateTime Excel计算日期(DateTime old_date, int monthNum) { int day = old_date.Day; DateTime new_date = DateTime.Now; new_date = old_date.AddMonths(monthNum); switch (day) { case 29: if (!DateTime.IsLeapYear(new_date.Year) && new_date.Month == 2 && new_date.Day == 28) { new_date = new_date.AddDays(1); } break; case 30: if (new_date.Month == 2) { if (DateTime.IsLeapYear(new_date.Year)) { if (new_date.Month == 2 && new_date.Day == 29) { new_date = new_date.AddDays(1); } } else { if (new_date.Month == 2 && new_date.Day == 28) { new_date = new_date.AddDays(1); } } } break; case 31: if (new_date.Day == 30) { if (new int[] { 4, 6, 9, 11 }.Contains(new_date.Month)) { new_date = new_date.AddDays(1); } } else if (new_date.Day == 29) { if (DateTime.IsLeapYear(new_date.Year)) { new_date = new_date.AddDays(1); } } else if (new_date.Day == 28) { if (!DateTime.IsLeapYear(new_date.Year)) { new_date = new_date.AddDays(1); } } break; default: break; } return new_date; }
2.数字转大写
////// 数字转化为大写 /// /// ///public static string numtoUpper(int num) { String str = num.ToString(); string rstr = ""; int n; for (int i = 0; i < str.Length; i++) { n = Convert.ToInt16(str[i].ToString());//char转数字,转换为字符串，再转数字 switch (n) { case 0: rstr = rstr + "〇"; break; case 1: rstr = rstr + "一"; break; case 2: rstr = rstr + "二"; break; case 3: rstr = rstr + "三"; break; case 4: rstr = rstr + "四"; break; case 5: rstr = rstr + "五"; break; case 6: rstr = rstr + "六"; break; case 7: rstr = rstr + "七"; break; case 8: rstr = rstr + "八"; break; default: rstr = rstr + "九"; break; } } return rstr; }
3.日、月、日期转大写
//月转化为大写
public static string monthtoUpper(int month)
{
if (month < 10)
{
return numtoUpper(month);
}
else
if (month == 10) { return "十"; }
else
{
return "十" + numtoUpper(month - 10);
}
}
//日转化为大写
public static string daytoUpper(int day)
{
if (day < 20)
{
return monthtoUpper(day);
}
else
{
String str = day.ToString();
if (str[1] == '0')
{
return numtoUpper(Convert.ToInt16(str[0].ToString())) + "十";
}
else
{
return numtoUpper(Convert.ToInt16(str[0].ToString())) + "十"
+ numtoUpper(Convert.ToInt16(str[1].ToString()));
}
}
}
//日期转换为大写
public static string dateToUpper(System.DateTime date)
{
int year = date.Year;
int month = date.Month;
int day = date.Day;
return numtoUpper(year) + "年" + monthtoUpper(month) + "月" + daytoUpper(day) + "日";
}
4.人民币金额小写转大写
////// 转换人民币大小金额 /// /// 金额 ///返回大写形式 public static string GetUpper(decimal num) { String[] tmpString = num.ToString().Split('.'); String intString = num.ToString(); // 默认为整数 String decString = ""; // 保存小数部分字串 String rmbCapital = ""; // 保存中文大写字串 int k; int j; int n; if (tmpString.Length > 1) { intString = tmpString[0]; // 取整数部分 decString = tmpString[1]; // 取小数部分 } decString += "00"; decString = decString.Substring(0, 2); // 保留两位小数位 intString += decString; try { k = intString.Length - 1; if (k > 0 && k < 18) { for (int i = 0; i <= k; i++) { j = (int)intString[i] - 48; // rmbCapital = rmbCapital + cnNumber[j] + cnUnit[k-i]; // 供调试用的直接转换 n = i + 1 >= k ? (int)intString[k] - 48 : (int)intString[i + 1] - 48; // 等效于 if( ){ }else{ } if (j == 0) { if (k - i == 2 || k - i == 6 || k - i == 10 || k - i == 14) { rmbCapital += cnUnit[k - i]; } else { if (n != 0) { rmbCapital += cnNumber[j]; } } } else { rmbCapital = rmbCapital + cnNumber[j] + cnUnit[k - i]; } } rmbCapital = rmbCapital.Replace("兆亿万", "兆"); rmbCapital = rmbCapital.Replace("兆亿", "兆"); rmbCapital = rmbCapital.Replace("亿万", "亿"); rmbCapital = rmbCapital.TrimStart('元'); rmbCapital = rmbCapital.TrimStart('零'); string lastStr = rmbCapital.Substring(rmbCapital.Length - 1); if (lastStr == "元" || lastStr == "角") rmbCapital += "整"; return rmbCapital; } else { return ""; // 超出转换范围时，返回零长字串 } } catch { return ""; // 含有非数值字符时，返回零长字串 } }
5.获取中文字拼音首字母
////// 获取中文拼音首字母 /// /// 中文字符串 /// 是否转化为大写 ///public static string GetSpellCode(string ChineseStr, bool ToUpper = true) { string Capstr = string.Empty; byte[] ZW = new byte[2]; long ChineseStr_int; string CharStr, ChinaStr = ""; for (int i = 0; i <= ChineseStr.Length - 1; i++) { CharStr = ChineseStr.Substring(i, 1).ToString(); ZW = System.Text.Encoding.Default.GetBytes(CharStr);// 得到汉字符的字节数组 if (ZW.Length == 1) { ChinaStr = CutString(CharStr.ToUpper(), 1); } else { int i1 = (short)(ZW[0]); int i2 = (short)(ZW[1]); ChineseStr_int = i1 * 256 + i2; if ((ChineseStr_int >= 45217) && (ChineseStr_int <= 45252)) { ChinaStr = "a"; } else if ((ChineseStr_int >= 45253) && (ChineseStr_int <= 45760)) { ChinaStr = "b"; } else if ((ChineseStr_int >= 45761) && (ChineseStr_int <= 46317)) { ChinaStr = "c"; } else if ((ChineseStr_int >= 46318) && (ChineseStr_int <= 46825)) { ChinaStr = "d"; } else if ((ChineseStr_int >= 46826) && (ChineseStr_int <= 47009)) { ChinaStr = "e"; } else if ((ChineseStr_int >= 47010) && (ChineseStr_int <= 47296)) { ChinaStr = "f"; } else if ((ChineseStr_int >= 47297) && (ChineseStr_int <= 47613)) { ChinaStr = "g"; } else if ((ChineseStr_int >= 47614) && (ChineseStr_int <= 48118)) { ChinaStr = "h"; } else if ((ChineseStr_int >= 48119) && (ChineseStr_int <= 49061)) { ChinaStr = "j"; } else if ((ChineseStr_int >= 49062) && (ChineseStr_int <= 49323)) { ChinaStr = "k"; } else if ((ChineseStr_int >= 49324) && (ChineseStr_int <= 49895)) { ChinaStr = "l"; } else if ((ChineseStr_int >= 49896) && (ChineseStr_int <= 50370)) { ChinaStr = "m"; } else if ((ChineseStr_int >= 50371) && (ChineseStr_int <= 50613)) { ChinaStr = "n"; } else if ((ChineseStr_int >= 50614) && (ChineseStr_int <= 50621)) { ChinaStr = "o"; } else if ((ChineseStr_int >= 50622) && (ChineseStr_int <= 50905)) { ChinaStr = "p"; } else if ((ChineseStr_int >= 50906) && (ChineseStr_int <= 51386)) { ChinaStr = "q"; } else if ((ChineseStr_int >= 51387) && (ChineseStr_int <= 51445)) { ChinaStr = "r"; } else if ((ChineseStr_int >= 51446) && (ChineseStr_int <= 52217)) { ChinaStr = "s"; } else if ((ChineseStr_int >= 52218) && (ChineseStr_int <= 52697)) { ChinaStr = "t"; } else if ((ChineseStr_int >= 52698) && (ChineseStr_int <= 52979)) { ChinaStr = "w"; } else if ((ChineseStr_int >= 52980) && (ChineseStr_int <= 53640)) { ChinaStr = "x"; } else if ((ChineseStr_int >= 53689) && (ChineseStr_int <= 54480)) { ChinaStr = "y"; } else if ((ChineseStr_int >= 54481) && (ChineseStr_int <= 55289)) { ChinaStr = "z"; } else { ChinaStr = CharStr; } } Capstr += ChinaStr; } Capstr = Capstr.Replace("昊", "h").Replace("丞", "c").Replace("鑫", "x").Replace("蕲", "Q"); return ToUpper ? Capstr.ToUpper() : Capstr.ToLower(); }
6.银行卡号设置4位加空格
////// 银行卡每四位加空格 /// /// 银行卡号 ///public static string 处理银行卡号(string Card) { if (String.IsNullOrEmpty(Card)) return ""; Card = Card.Replace(" ",""); return Regex.Replace(Card, @"(\d{4}(?!$))", "$1 "); }
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。