转(string和byte[]的转换(C#)

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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 "
        public static byte[] GetBytes(string hexString, out int discarded)
        } private static byte[] HexToByte(string hexString)
{
byte[] returnBytes = new byte[hexString.Length / 2];
for (int i = 0; i < returnBytes.Length; i++)
returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
return returnBytes;
}
private int HexToByte(string hex)
        {
           int result;
            result = 0;

            switch (hex[0])
            {
                case '0': result = 0x00; break;
                case '1': result = 0x10; break;
                case '2': result = 0x20; break;
                case '3': result = 0x30; break;
                case '4': result = 0x40; break;
                case '5': result = 0x50; break;
                case '6': result = 0x60; break;
                case '7': result = 0x70; break;
                case '8': result = 0x80; break;
                case '9': result = 0x90; break;
                case 'a':
                case 'A': result = 0xa0; break;
                case 'b':
                case 'B': result = 0xb0; break;
                case 'c':
                case 'C': result = 0xc0; break;
                case 'd':
                case 'D': result = 0xd0; break;
                case 'e':
                case 'E': result = 0xe0; break;
                case 'f':
                case 'F': result = 0xf0; break;

            }
            switch (hex[1])
            {
                case '0': result +=0x00; break;
                case '1': result += 0x01; break;
                case '2': result += 0x02; break;
                case '3': result += 0x03; break;
                case '4': result += 0x04; break;
                case '5': result += 0x05; break;
                case '6': result += 0x06; break;
                case '7': result += 0x07; break;
                case '8': result += 0x08; break;
                case '9': result += 0x09; break;
                case 'a':
                case 'A': result += 0x0a; break;
                case 'b':
                case 'B': result += 0x0b; break;
                case 'c':
                case 'C': result += 0x0c; break;
                case 'd':
                case 'D': result += 0x0d; break;
                case 'e':
                case 'E': result += 0x0e; break;
                case 'f':
                case 'F': result += 0x0f; break;

            }

            return result;
        }