C# string 轉 byte[]

string 轉 byte[]

        /// <summary>
        /// string 轉 byte
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        byte[] Str_change_byte(string str)
        {
            byte[] Data = new byte[str.Length];
            int count = 0;
            string strSource = str.Replace("\n", "").Replace(" ", "").Replace("\t", "").Replace("\r", "");

            try
            {
                for (int i = 0; i < (strSource.Length - strSource.Length % 2) / 2; i++)//取余3運算作用是防止用戶輸入的字符為奇數個
                {
                    Data[count] = Convert.ToByte(strSource.Substring(i * 2, 2), 16);
                    count++;
                }
                if (strSource.Length % 2 != 0)//剩下一位單獨處理
                {
                    Data[count] = Convert.ToByte(strSource.Substring(strSource.Length - 1, 1), 16);//單獨處理B（0B）
                    count++;
                }
            }
            catch (Exception)
            {
                MessageBox.Show("Error：數據包含非法字符\n", "錯誤:", MessageBoxButtons.OK, MessageBoxIcon.Error);//出錯提示
                return null;
            }
            byte[] buf = new byte[count];
            Array.Copy(Data, 0, buf, 0, count); //復制原始數據    
            return buf;
        }

 string 轉 ASCII

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

 

 

 

以下內容為轉載：

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

string類型轉成byte[]：

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

byte[]轉成string：

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

 

string類型轉成ASCII byte[]：

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

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

ASCIIbyte[]轉成string：

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

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

byte[]轉16進制格式string：

new byte[]{ 0x30, 0x31}轉成"3031":

publicstaticstring 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;        
}

 

 

16進制格式string 轉byte[]：

publicstaticbyte[] GetBytes(string hexString, outint discarded)

{            

discarded = 0;

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(0, newString.Length-1);            }

int byteLength = newString.Length / 2;byte[] bytes = newbyte[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;       

 }