C#实现字符串自增和自减运算，供大家参考，具体内容如下
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；
/// <summary>
/// 字符串运算
/// </summary>
public class StringOperation
{
/// <summary>
/// 通过ASCII码值，对字符串自增1
/// </summary>
/// <param name="pStr">输入字符串</param>
/// <returns></returns>
public static string StringIncreaseOne( string pStr)
{
var vRetStr = pStr;
if (0 == pStr.Length)
{
vRetStr = "1" ;
}
else
{
// 将最后一个字符与之前的字符串分开
string vOtherStr = pStr.Substring(0, pStr.Length – 1);
int vIntChar = ( int )pStr[pStr.Length – 1]; //转ASCII码值
if (48 <= vIntChar && vIntChar <= 57) //是数字（0 – 9）
{
vIntChar++; //自增1
if (vIntChar == 58) // 进一位
{
vIntChar = 48;
vOtherStr = StringIncreaseOne(vOtherStr);
}
}
else if (65 <= vIntChar && vIntChar <= 90) //是字母（A – Z）
{
vIntChar++; //自增1
if (vIntChar == 91)
{
vIntChar = 65;
vOtherStr = StringIncreaseOne(vOtherStr);
}
}
else if (97 <= vIntChar && vIntChar <= 122) //是字母（a – z）
{
vIntChar++; //自增1
if (vIntChar == 123)
{
vIntChar = 97;
vOtherStr = StringIncreaseOne(vOtherStr);
}
}
else // 其它字符 -> 跳过
{
vOtherStr = StringIncreaseOne(vOtherStr);
}
vRetStr = vOtherStr + ( char )vIntChar;
}
return vRetStr;
}
/// <summary>
/// 通过ASCII码值，对字符串自减1
/// </summary>
/// <param name="pStr">输入字符串</param>
/// <returns></returns>
public static string StringReducingOne( string pStr)
{
var vRetStr = pStr;
if (0 == pStr.Length)
{
vRetStr = "9" ;
}
else
{
string vOtherStr = pStr.Substring(0, pStr.Length – 1);
int vIntChar = ( int )pStr[pStr.Length – 1]; //转ASCII码值
if (48 <= vIntChar && vIntChar <= 57) //是数字（0 – 9）
{
vIntChar–;
if (vIntChar == 47)
{
vIntChar = 57;
vOtherStr = StringReducingOne(vOtherStr);
}
}
else if (65 <= vIntChar && vIntChar <= 90) //是数字（A – Z）
{
vIntChar–;
if (vIntChar == 64)
{
vIntChar = 90;
vOtherStr = StringReducingOne(vOtherStr);
}
}
else if (97 <= vIntChar && vIntChar <= 122) //是数字（a – z）
{
vIntChar–;
if (vIntChar == 96)
{
vIntChar = 122;
vOtherStr = StringReducingOne(vOtherStr);
}
}
else // 其它字符 -> 跳过
{
vOtherStr = StringReducingOne(vOtherStr);
}
vRetStr = vOtherStr + ( char )vIntChar;
}
return vRetStr;
}
/// <summary>
/// 通过ASCII码值，对字符串自增
/// </summary>
/// <param name="pStr">输入字符串</param>
/// <param name="pCount">自增个数</param>
/// <returns></returns>
public static string StringIncrease( string pStr, int pCount)
{
string vRetStr = pStr;
for ( int i = 0; i < pCount; i++)
{
vRetStr = StringIncreaseOne(vRetStr);
}
return vRetStr;
}
/// <summary>
/// 通过ASCII码值，对字符串自减
/// </summary>
/// <param name="pStr">输入字符串</param>
/// <param name="pCount">自减个数</param>
/// <returns></returns>
public static string StringReducing( string pStr, int pCount)
{
string vRetStr = pStr;
for ( int i = 0; i < pCount; i++)
{
vRetStr = StringReducingOne(vRetStr);
}
return vRetStr;
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/CUIT-DX037/p/6770535.html
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