转(string和byte[]的转换 (C#)

|▌冷眼眸甩不掉的悲伤 提交于 2020-02-01 02:05:43
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.UTF8EncodingSystem.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 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;
        }
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