C# string 转 byte[]

string 转 byte[]

        /// <summary>
        /// string 转 byte
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        byte[] Str_change_byte(string str)
        {
            byte[] Data = new byte[str.Length];
            int count = ;
            string strSource = str.Replace("\n", "").Replace(" ", "").Replace("\t", "").Replace("\r", "");

            try
            {
                for (int i = ; i < (strSource.Length - strSource.Length % ) / ; i++)//取余3运算作用是防止用户输入的字符为奇数个
                {
                    Data[count] = Convert.ToByte(strSource.Substring(i * , ), );
                    count++;
                }
                if (strSource.Length %  != )//剩下一位单独处理
                {
                    Data[count] = Convert.ToByte(strSource.Substring(strSource.Length - , ), );//单独处理B（0B）
                    count++;
                }
            }
            catch (Exception)
            {
                MessageBox.Show("Error：数据包含非法字符\n", "错误:", MessageBoxButtons.OK, MessageBoxIcon.Error);//出错提示
                return null;
            }
            byte[] buf = new byte[count];
            Array.Copy(Data, , buf, , count); //复制原始数据
            return buf;
        }

string 转 ASCII

        public static byte[] str2ASCII(String xmlStr)
        {
            return Encoding.Default.GetBytes(xmlStr);
        }

以下内容为转载：

https://www.cnblogs.com/Maxq/p/5953682.html

string类型转成byte[]：

byte[] byteArray = System.Text.Encoding.Default.GetBytes ( str );

byte[]转成string：

string str = System.Text.Encoding.Default.GetString ( byteArray );

string类型转成ASCII byte[]：

（"01" 转成 byte[] = new byte[]{ 0x30,0x31}）

byte[] byteArray = System.Text.Encoding.ASCII.GetBytes ( str );

ASCIIbyte[]转成string：

（byte[] = new byte[]{ 0x30, 0x31} 转成"01"）

string str = System.Text.Encoding.ASCII.GetString ( byteArray );

byte[]转16进制格式string：

new byte[]{ 0x30, 0x31}转成"3031":

publicstaticstring ToHexString ( byte[] bytes ) // 0xae00cf => "AE00CF "
{
string hexString = string.Empty;
if ( bytes != null )
 {
   StringBuilder strB = new StringBuilder ();
   for ( int i = ; i < bytes.Length; i++ )
   {
      strB.Append ( bytes[i].ToString ( "X2" ) );
   }
   hexString = strB.ToString ();
 }return hexString;        
}

16进制格式string 转byte[]：

publicstaticbyte[] GetBytes(string hexString, outint discarded)

{            

discarded = ;

string newString = "";

char c;// remove all none A-F, 0-9, charactersfor (int i=0; i<hexString.Length; i++)

{              

  c = hexString[i];if (IsHexDigit(c))                    

newString += c;

else                    

discarded++;            

}// if odd number of characters, discard last characterif (newString.Length % 2 != 0){                discarded++;                

newString = newString.Substring(, newString.Length-);            }

int byteLength = newString.Length / ;byte[] bytes = newbyte[byteLength];string hex;int j = ;for (int i=; i<bytes.Length; i++){               

 hex = new String(new Char[] {newString[j], newString[j+]});               

 bytes[i] = HexToByte(hex);                j = j+;           

 }

return bytes;       

 }