C#中string与byte[]的转换

using System;

using System.Text;

namespace SidleHelper

{

/// <summary>

/// Summary description for StrHelper.

/// 命名缩写：

/// Str: unicode string

/// Arr: unicode array

/// Hex: 二进制数据

/// Hexbin: 二进制数据用ASCII字符表示 例 字符'1'的hex是0x31表示为hexbin是 '3''1'

/// Asc: ASCII

/// Uni: UNICODE

/// </summary>

public sealed class StrHelper

{

#region Hex与Hexbin的转换

public static void Hexbin2Hex(byte[] bHexbin, byte[] bHex, int nLen)

{

for (int i = 0; i < nLen / 2; i++)

{

if (bHexbin[2 * i] < 0x41)

{

bHex[i] = Convert.ToByte(((bHexbin[2 * i] - 0x30) << 4) & 0xf0);

}

else

{

bHex[i] = Convert.ToByte(((bHexbin[2 * i] - 0x37) << 4) & 0xf0);

}

if (bHexbin[2 * i + 1] < 0x41)

{

bHex[i] |= Convert.ToByte((bHexbin[2 * i + 1] - 0x30) & 0x0f);

}

else

{

bHex[i] |= Convert.ToByte((bHexbin[2 * i + 1] - 0x37) & 0x0f);

}

}

}

public static byte[] Hexbin2Hex(byte[] bHexbin, int nLen)

{

if (nLen % 2 != 0)

return null;

byte[] bHex = new byte[nLen / 2];

Hexbin2Hex(bHexbin, bHex, nLen);

return bHex;

}

public static void Hex2Hexbin(byte[] bHex, byte[] bHexbin, int nLen)

{

byte c;

for (int i = 0; i < nLen; i++)

{

c = Convert.ToByte((bHex[i] >> 4) & 0x0f);

if (c < 0x0a)

{

bHexbin[2 * i] = Convert.ToByte(c + 0x30);

}

else

{

bHexbin[2 * i] = Convert.ToByte(c + 0x37);

}

c = Convert.ToByte(bHex[i] & 0x0f);

if (c < 0x0a)

{

bHexbin[2 * i + 1] = Convert.ToByte(c + 0x30);

}

else

{

bHexbin[2 * i + 1] = Convert.ToByte(c + 0x37);

}

}

}

public static byte[] Hex2Hexbin(byte[] bHex, int nLen)

{

byte[] bHexbin = new byte[nLen * 2];

Hex2Hexbin(bHex, bHexbin, nLen);

return bHexbin;

}

#endregion

#region 数组和字符串之间的转化

public static byte[] Str2Arr(String s)

{

return (new UnicodeEncoding()).GetBytes(s);

}

public static string Arr2Str(byte[] buffer)

{

return (new UnicodeEncoding()).GetString(buffer, 0, buffer.Length);

}

public static byte[] Str2AscArr(String s)

{

return System.Text.UnicodeEncoding.Convert(System.Text.Encoding.Unicode,

System.Text.Encoding.ASCII,

Str2Arr(s));

}

public static byte[] Str2HexAscArr(String s)

{

byte[] hex = Str2AscArr(s);

byte[] hexbin = Hex2Hexbin(hex, hex.Length);

return hexbin;

}

public static string AscArr2Str(byte[] b)

{

return System.Text.UnicodeEncoding.Unicode.GetString(

System.Text.ASCIIEncoding.Convert(System.Text.Encoding.ASCII,

System.Text.Encoding.Unicode,

b)

);

}

public static string HexAscArr2Str(byte[] buffer)

{

byte[] b = Hex2Hexbin(buffer, buffer.Length);

return AscArr2Str(b);

}

#endregion

}

}