c# 如何将字符串转换为大写或小写
目录
c#将字符串转换为大写或小写
c#大小写转换合集
1.在代码中以 Excel 加日期的算法
2.数字转大写
3.日、月、日期转大写
4.人民币金额小写转大写
5.获取中文字拼音首字母
6.银行卡号设置4位加空格
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
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
/// <summary>
/// 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
/// </summary>
/// <param name="old_date">原日期</param>
/// <param name="monthNum">所加的月数</param>
/// <returns>新的日期</returns>
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
/// <summary>
/// 数字转化为大写
/// </summary>
/// <param name="num"></param>
/// <returns></returns>
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
/// <summary>
/// 转换人民币大小金额
/// </summary>
/// <param name="num">金额</param>
/// <returns>返回大写形式</returns>
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
/// <summary>
/// 获取中文拼音首字母
/// </summary>
/// <param name="ChineseStr">中文字符串</param>
/// <param name="ToUpper">是否转化为大写</param>
/// <returns></returns>
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
/// <summary>
/// 银行卡每四位加空格
/// </summary>
/// <param name="Card">银行卡号</param>
/// <returns></returns>
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软件开发网。
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