Programmatically check if a COM port exists in C#

Question

I just got myself into using the SerialPort object in C# and I realised it throws an exception saying that "COM1" does not exist. I checked my device manager to see what COM ports I can use, but is there a way to find out what COM ports are available and programmatically select one of them?

Answer 1

Yes, use SerialPort.GetPortNames() , which returns an array of strings of available port names.

Then create your SerialPort object by specifying one of the names in the constructor.

string[] ports = SerialPort.GetPortNames();
SerialPort port = new SerialPort(ports[0]);  // create using first existing serial port, for example

Answer 2

One-liner :

if(SerialPort.GetPortNames().ToList().Contains(comportName)) 
{
    port = new SerialPort(comportName)
}

Answer 3

这是另一种方式

string portExists = SerialPort.GetPortNames().Any(x => x == "COM1");