SerialPort.GetPortNames Method ()


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Gets an array of serial port names for the current computer.

Namespace:   System.IO.Ports
Assembly:  System (in System.dll)

public static string[] GetPortNames()

Return Value

Type: System.String[]

An array of serial port names for the current computer.

Exception Condition

The serial port names could not be queried.

The order of port names returned from GetPortNames is not specified.

Use the GetPortNames method to query the current computer for a list of valid serial port names. For example, you can use this method to determine whether COM1 and COM2 are valid serial ports for the current computer.

The port names are obtained from the system registry (for example, HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM). If the registry contains stale or otherwise incorrect data then the GetPortNames method will return incorrect data.

The following code example uses the GetPortNames method to display serial port names to the console.

using System;
using System.IO.Ports;

namespace SerialPortExample
    class SerialPortExample
        public static void Main()
            // Get a list of serial port names.
            string[] ports = SerialPort.GetPortNames();

            Console.WriteLine("The following serial ports were found:");

            // Display each port name to the console.
            foreach(string port in ports)


.NET Framework
Available since 2.0
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