C# string类型和byte[]类型相互转换

string类型转成byte[]：

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

byte[]转成string：

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

string类型转成ASCII byte[]：

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

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

ASCIIbyte[]转成string：

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

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

byte[]转16进制格式string：

new byte[]{ 0x30, 0x31}转成"3031":

publicstaticstring 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;        

}

16进制格式string 转byte[]：

publicstaticbyte[] GetBytes(string hexString, outint discarded)

{            

discarded = 0;

string newString = "";

char c;// remove all none A-F, 0-9, charactersfor (int i=0; i<hexString.Length; i++)

{              

  c = hexString[i];if (IsHexDigit(c))                    

newString += c;

else                    

discarded++;            

}// if odd number of characters, discard last characterif (newString.Length % 2 != 0){                discarded++;                

newString = newString.Substring(0, newString.Length-1);            }

int byteLength = newString.Length / 2;byte[] bytes = newbyte[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;       

 }