C#字符串与byte[]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":
public static string ToHexString(byte[] bytes) // 0xae00cf => "AE00CF "

{
string hexString = string.Empty;
if (bytes != null)
{
System.Text.StringBuilder strB = new System.Text.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[]：

public static byte[] hexStringToBytes(string hexString)
{
if (hexString == null || hexString.Equals(""))
{
return null;
}
hexString = hexString.ToUpper();
int length = hexString.Length / 2;
char[] hexChars = hexString.ToCharArray();
byte[] d = new byte[length];
for (int i = 0; i < length; i++)
{
int pos = i * 2;
d[i] = (byte)(charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
}
return d;
}