C# int 转 16进制的字符串 in to hex string

网上有人写的，其中有个错误，只需把大于号改成大于等于就好了，在此重新发一下。在framework 2.0里面bitconverter不够强大。所以不得不自己写个函数

以前是

while (ulong.Parse(value) > 16)

我将其改成了

while (ulong.Parse(value) >= 16)

测试了很多数据，结果是一致的。

public class CryptString
{
///
/// 转换数字成单个16进制字符，要求输入值小于16
///
/// value
///
public static string GetHexChar(string value)
{
string sReturn = string.Empty;
switch (value)
{
case "10":
sReturn = "A";
break;
case "11":
sReturn = "B";
break;
case "12":
sReturn = "C";
break;
case "13":
sReturn = "D";
break;
case "14":
sReturn = "E";
break;
case "15":
sReturn = "F";
break;
default:
sReturn = value;
break;
}
return sReturn;
}

///
/// 返回进制字符串
///
/// value
///

public static string ConvertHex(string value)
{
string sReturn = string.Empty;
try
{

while (ulong.Parse(value) >= 16)
{
ulong v = ulong.Parse(value);
sReturn = GetHexChar((v % 16).ToString()) + sReturn;
value = Math.Floor(Convert.ToDouble(v / 16)).ToString();
}
sReturn = GetHexChar(value) + sReturn;
}
catch
{
sReturn = "###Valid Value!###";
}
return sReturn;
}
}