c#|c# 如何将字符串转换为大写或小写 c#如何将字符串转换为大写或小

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

文章图片

文章图片

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); }elseif (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(); }

【c#|c# 如何将字符串转换为大写或小写】
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。