string和byte[]的转换 (C#)

string和byte[]的转换 (C#)

2008-04-09 10:40 by Mainz, 13956 visits, 网摘, 收藏, 编辑

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 "






{


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;


}