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asp教程.net 10进制字符串转换为十六进制字符串
public string strtohex(string mstr) //返回处理后的十六进制字符串
    {
    return bitconverter.tostring(
    asciiencoding.default.getbytes(mstr)).replace("-", " ");
    } /* strtohex */

   16进制字符串转换为10进制字符串
 public string hextostr(string mhex) // 返回十六进制代表的字符串
    {
    mhex = mhex.replace(" ", "");
    if (mhex.length <= 0) return "";
    byte[] vbytes = new byte[mhex.length / 2];
    for (int i = 0; i < mhex.length; i += 2)
    if (!byte.tryparse(mhex.substring(i, 2), numberstyles.hexnumber, null, out vbytes[i / 2]))
    vbytes[i / 2] = 0;
    return asciiencoding.default.getstring(vbytes);
    } /* hextostr */

    字符串转换为宽字符

     public static string stringtowchar(string s)
    {
        stringbuilder outs = new stringbuilder();
        foreach (char item in s)
        {
            if (isencoding(item))//判断是否编码
            {
                outs.append(string.format("u{0:x4}", (int)item));
            }
            else//不是中文
            {
                outs.append(item);
            }
        }
        return outs.tostring();
    }

    private static bool isencoding(char cha)
    {
        string nonencodingchats = "abcdefghijklmnopqrstuvwxyz0123456789`!@#$%^&*()_+|-=,./;"[]{}:<>?";
        return nonencodingchats.indexof(cha) == -1;
    }

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