C＃-没有简单的方法将十六进制和ASCII连接为单个字符串

Question

In Python I'm able to concatenate both hex and ascii into a single string, then send it to the device I'm trying to control

   _startTransmit = "\x02"
   _channel = 7
   command_string = _startTransmit + "PGM:" + str(_channel) + ";"
try:
  written = conn.write(command_string.encode('utf-8'))

This SO Answer makes it appear building a byte array is the only way to do it in C#

So, it appears there is no similar way to concatenate hex and ascii in C# as there is in Python. Am I correct?

Answer 1

I'd look at using the string interpolator operator $ before the "string":

var _startTransmit = (char)0x02; //ints can be written in 0xFF format in the source code and cast to char e.g. (char)0x41 is a capital A
var _channel = 7; 
var command_string = $"{_startTransmit}PGM:{_channel};"

The last line is syntactic sugar for:

var command_string = string.Format("{0}PGM:{1};", _startTransmit, _channel);

The things in {brackets} can have format specifiers, eg pad out the _channel to 4 chars with leading spaces, zeroes etc {_channel:0000} - see https://docs.microsoft.com/en-us/dotnet/api/system.string.format?view=netframework-4.8