谁帮我把这段java 翻译成c#
package com.yeexing.webservice.util;

import java.security.MessageDigest;

public class MD5Util {
public final static String MD5(String s) {
char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
try {
byte[] strTemp = s.getBytes();
MessageDigest mdTemp = MessageDigest.getInstance("MD5");
mdTemp.update(strTemp);
byte[] md = mdTemp.digest();
int j = md.length;
char str[] = new char[j * 2];
int k = 0;
for (int i = 0; i < j; i++) {
byte byte0 = md[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
return new String(str);
} catch (Exception e) {
return null;
}
}

public static String MD5Encode(String origin, String charsetname) {
String resultString = null;
try {
resultString = new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
if (charsetname == null || "".equals(charsetname))
resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
else
resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
} catch (Exception exception) {
}
return resultString;
}

private static String byteArrayToHexString(byte b[]) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++)
resultSb.append(byteToHexString(b[i]));

return resultSb.toString();
}

private static String byteToHexString(byte b) {
int n = b;
if (n < 0)
n += 256;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}

private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d",
"e", "f" };
}


------解决方案--------------------
C#直接就有MD5类，不需要翻译，直接使用。
------解决方案--------------------
MD5加密前几天整的 跟PHP加密后一样 不知道跟JAVA是不是一样
static string MD5(string toCryString)
{
MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
return BitConverter.ToString(hashmd5.ComputeHash(Encoding.UTF8.GetBytes(toCryString))).Replace("-", "").ToLower();//asp是小写,把所有字符变小写
}

------解决方案--------------------
http://www.cnblogs.com/dgjack/archive/2010/12/30/1921492.html
------解决方案--------------------
不一样，Java返回的是十六进制字符串，而不是Encoding编码的字符串。其实最后一句应该用这个函数调用
return BytesToString(result);

C# code

        public static string BytesToString(byte[] input)
        {
            StringBuilder sb = new StringBuilder();
            foreach (byte b in input)
            {
                sb.Append(b.ToString("X2"));
            }
            return sb.ToString();
        }
        public static byte[] StringToBytes(string input)
        {
            int len = input.Length;
            if (len % 2 != 0)
            {
                throw new Exception("输入的字符串长度有误，必须是偶数。");
            }
            byte[] bytes = new byte[len / 2];
            for (int i = 0; i < len / 2; i++)
            {
                if (!byte.TryParse(input.Substring(i * 2, 2), System.Globalization.NumberStyles.HexNumber, null, out bytes[i]))
                {
                    throw new Exception(string.Format("在位置{0}处的字符无法转换为16进制字节", i * 2 + 1));
                }
            }