轉 string和byte[]的轉換 (C#)

轉 string和byte[]的轉換 (C#)

 string類型轉成byte[]：

byte[] byteArray = System.Text.Encoding.Default.GetBytes ( str ); 反過來，byte[]轉成string： string str = System.Text.Encoding.Default.GetString ( byteArray ); 其它編碼方式的，如System.Text.UTF8Encoding，System.Text.UnicodeEncoding class等；例如： string類型轉成ASCII byte[]：（"01" 轉成 byte[] = new byte[]{ 0x30, 0x31}） byte[] byteArray = System.Text.Encoding.ASCII.GetBytes ( str ); ASCII byte[] 轉成string：（byte[] = new byte[]{ 0x30, 0x31} 轉成 "01"） string str = System.Text.Encoding.ASCII.GetString ( byteArray );   有時候還有這樣一些需求： byte[] 轉成原16進制格式的string，例如0xae00cf, 轉換成 "ae00cf"；new byte[]{ 0x30, 0x31}轉成"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;         } 反過來，16進制格式的string 轉成byte[]，例如, "ae00cf"轉換成0xae00cf，長度縮減一半；"3031" 轉成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;         }