c# byte[] 与string转化
2015-07-24 17:03
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突然用到C#,学习下
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;
}
private static byte HexToByte(string hex)
{
byte tt = byte.Parse(hex, System.Globalization.NumberStyles.HexNumber);
return tt;
}
private static byte HexToByte(string hex)
{
byte tt = byte.Parse(hex, System.Globalization.NumberStyles.HexNumber);
return tt;
}
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;
}
private static byte HexToByte(string hex)
{
byte tt = byte.Parse(hex, System.Globalization.NumberStyles.HexNumber);
return tt;
}
private static byte HexToByte(string hex)
{
byte tt = byte.Parse(hex, System.Globalization.NumberStyles.HexNumber);
return tt;
}
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