本文URL:http://www.cnblogs.com/CUIT-DX037/p/6770535.html
实现字符串自增和自减运算:
1.数字从 0-9 变化;
2.字母从 A-Z、a-z 变化;
3.其它字符跳过;
4.以上变化依据其Ascii码值;
1 /// <summary> 2 /// 字符串运算 3 /// </summary> 4 public class StringOperation 5 { 6 7 8 /// <summary> 9 /// 通过ASCII码值,对字符串自增1 10 /// </summary> 11 /// <param name="pStr">输入字符串</param> 12 /// <returns></returns> 13 public static string StringIncreaseOne(string pStr) 14 { 15 var vRetStr = pStr; 16 if (0 == pStr.Length) 17 { 18 vRetStr = "1"; 19 } 20 else 21 { 22 // 将最后一个字符与之前的字符串分开 23 string vOtherStr = pStr.Substring(0, pStr.Length - 1); 24 int vIntChar = (int)pStr[pStr.Length - 1]; //转ASCII码值 25 if (48 <= vIntChar && vIntChar <= 57) //是数字(0 - 9) 26 { 27 vIntChar++; //自增1 28 if (vIntChar == 58) // 进一位 29 { 30 vIntChar = 48; 31 vOtherStr = StringIncreaseOne(vOtherStr); 32 } 33 } 34 else if (65 <= vIntChar && vIntChar <= 90) //是字母(A - Z) 35 { 36 vIntChar++; //自增1 37 if (vIntChar == 91) 38 { 39 vIntChar = 65; 40 vOtherStr = StringIncreaseOne(vOtherStr); 41 } 42 } 43 else if (97 <= vIntChar && vIntChar <= 122) //是字母(a - z) 44 { 45 vIntChar++; //自增1 46 if (vIntChar == 123) 47 { 48 vIntChar = 97; 49 vOtherStr = StringIncreaseOne(vOtherStr); 50 } 51 } 52 else // 其它字符 -> 跳过 53 { 54 vOtherStr = StringIncreaseOne(vOtherStr); 55 } 56 vRetStr = vOtherStr + (char)vIntChar; 57 } 58 return vRetStr; 59 } 60 61 /// <summary> 62 /// 通过ASCII码值,对字符串自减1 63 /// </summary> 64 /// <param name="pStr">输入字符串</param> 65 /// <returns></returns> 66 public static string StringReducingOne(string pStr) 67 { 68 var vRetStr = pStr; 69 if (0 == pStr.Length) 70 { 71 vRetStr = "9"; 72 } 73 else 74 { 75 string vOtherStr = pStr.Substring(0, pStr.Length - 1); 76 int vIntChar = (int)pStr[pStr.Length - 1]; //转ASCII码值 77 if (48 <= vIntChar && vIntChar <= 57) //是数字(0 - 9) 78 { 79 vIntChar--; 80 if (vIntChar == 47) 81 { 82 vIntChar = 57; 83 vOtherStr = StringReducingOne(vOtherStr); 84 } 85 } 86 else if (65 <= vIntChar && vIntChar <= 90) //是数字(A - Z) 87 { 88 vIntChar--; 89 if (vIntChar == 64) 90 { 91 vIntChar = 90; 92 vOtherStr = StringReducingOne(vOtherStr); 93 } 94 } 95 else if (97 <= vIntChar && vIntChar <= 122) //是数字(a - z) 96 { 97 vIntChar--; 98 if (vIntChar == 96) 99 { 100 vIntChar = 122; 101 vOtherStr = StringReducingOne(vOtherStr); 102 } 103 } 104 else // 其它字符 -> 跳过 105 { 106 vOtherStr = StringReducingOne(vOtherStr); 107 } 108 vRetStr = vOtherStr + (char)vIntChar; 109 } 110 return vRetStr; 111 } 112 113 /// <summary> 114 /// 通过ASCII码值,对字符串自增 115 /// </summary> 116 /// <param name="pStr">输入字符串</param> 117 /// <param name="pCount">自增个数</param> 118 /// <returns></returns> 119 public static string StringIncrease(string pStr, int pCount) 120 { 121 string vRetStr = pStr; 122 for (int i = 0; i < pCount; i++) 123 { 124 vRetStr = StringIncreaseOne(vRetStr); 125 } 126 return vRetStr; 127 } 128 129 /// <summary> 130 /// 通过ASCII码值,对字符串自减 131 /// </summary> 132 /// <param name="pStr">输入字符串</param> 133 /// <param name="pCount">自减个数</param> 134 /// <returns></returns> 135 public static string StringReducing(string pStr, int pCount) 136 { 137 string vRetStr = pStr; 138 for (int i = 0; i < pCount; i++) 139 { 140 vRetStr = StringReducingOne(vRetStr); 141 } 142 return vRetStr; 143 } 144 145 146 147 }