c# byte[] 与string转化

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string类型转成byte[]：

byte[] byteArray = System.Text.Encoding.Default.GetBytes ( str );

反过来，byte[]转成string：

string str = System.Text.Encoding.Default.GetString ( byteArray );

其它编码方式的，如System.Text.UTF8Encoding，System.Text.UnicodeEncoding class等；例如：

string类型转成ASCII byte[]：（"01" 转成 byte[] = new byte[]{ 0x30, 0x31}）

byte[] byteArray = System.Text.Encoding.ASCII.GetBytes ( str );

ASCII byte[] 转成string：（byte[] = new byte[]{ 0x30, 0x31} 转成 "01"）

string str = System.Text.Encoding.ASCII.GetString ( byteArray );

有时候还有这样一些需求：

byte[] 转成原16进制格式的string，例如0xae00cf, 转换成 "ae00cf"；new byte[]{ 0x30, 0x31}转成"3031":

public static string ToHexString ( byte[] bytes ) // 0xae00cf => "AE00CF "        {            string hexString = string.Empty;            if ( bytes != null )            {                StringBuilder strB = new StringBuilder ();                for ( int i = 0; i < bytes.Length; i++ )                {                    strB.Append ( bytes[i].ToString ( "X2" ) );                }                hexString = strB.ToString ();            }            return hexString;        }

反过来，16进制格式的string 转成byte[]，例如, "ae00cf"转换成0xae00cf，长度缩减一半；"3031" 转成new byte[]{ 0x30, 0x31}:

public static byte[] GetBytes(string hexString, out int discarded)        {            discarded = 0;            string newString = "";            char c;            // remove all none A-F, 0-9, characters            for (int i=0; i<hexString.Length; i++)            {                c = hexString[i];                if (IsHexDigit(c))                    newString += c;                else                    discarded++;            }            // if odd number of characters, discard last character            if (newString.Length % 2 != 0)            {                discarded++;                newString = newString.Substring(0, newString.Length-1);            }            int byteLength = newString.Length / 2;            byte[] bytes = new byte[byteLength];            string hex;            int j = 0;            for (int i=0; i<bytes.Length; i++)            {                hex = new String(new Char[] {newString[j], newString[j+1]});                bytes[i] = HexToByte(hex);                j = j+2;            }            return bytes;        }        private static byte HexToByte(string hex)        {            byte tt = byte.Parse(hex, System.Globalization.NumberStyles.HexNumber);            return tt;        }

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