C# 多进制转换

public class Converter
{
private static String keys = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";//编码,可加一些字符也可以实现72,96等任意进制转换，但是有符号数据不直观，会影响阅读。
private static int exponent = keys.Length;//幂数

//string conn_Str = "";

/// <summary>
/// 十进制转多进制
/// </summary>
/// <param name="value">十进制的值<</param>
/// <param name="s">进制字符<</param>
/// <param name="k">多少进制<</param>
/// <returns>Return a specified 62 encode string</returns>
public static string Decimal2Str(decimal value, string s = "", int k = 0)
{
string result = string.Empty;
if (s != "")
{
keys = s;
}
else
{
if (k >= 2 && k <= 36)//二进制到36进制
{
keys = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
keys = keys.Substring(0, k);
}
}
exponent = keys.Length;
do
{
decimal index = value % exponent;
result = keys[(int)index] + result;
value = (value - index) / exponent;
}
while (value > 0);

return result;
}

/// <summary>
/// 多进制转十进制
/// </summary>
/// <param name="value">多进制的值</param>
/// <param name="s">进制字符<</param>
/// <param name="k">多少进制<</param>
/// <returns>Return a specified decimal number that decode by 62 string</returns>
public static decimal Str2Decimal(string value, string s = "", int k = 0)
{
decimal result = 0;
if (s != "")
{
keys = s;
}
else
{
if (k >= 2 && k <= 36)//二进制到36进制
{
keys = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
keys = keys.Substring(0, k);
}
}
exponent = keys.Length;
for (int i = 0; i < value.Length; i++)
{
int x = value.Length - i - 1;
result += keys.IndexOf(value[i]) * Pow(exponent, x);// Math.Pow(exponent, x);
}
return result;
}

/// <summary>
/// 一个数据的N次方
/// </summary>
/// <param name="x"></param>
/// <returns></returns>
private static decimal Pow(decimal baseNo, decimal x)
{
decimal value = 1;////1 will be the result for any number's power 0.任何数的0次方，结果都等于1
while (x > 0)
{
value = value * baseNo;
x--;
}
return value;
}
}