How can I write code that works differently for different operating systems?

I am Writing a File I/O code

I found out that each OS use different newline characters

so I wanna make a code that works differently for each OS
like below code

if(isWindows)
{
    Console.Write("Hello World\r\n");
}
else
{
    Console.Write("Hello World\n");
}

Please let me know if you know a good way!

If you only want to check for line breaks, you can use System.Environment.NewLine. This will return \r\n for non-Unix platforms and \n for Unix platforms.

Console.Write("Hello World" + System.Environment.NewLine);

However, if you need to implement separate code logic for each operating system, you could use RuntimeInformation.IsOSPlatform. This method can identify the following platforms:

• FreeBSD
• Linux
• OSX
• Windows

Your code would look something like this:

if (System.Runtime.InteropServices.RuntimeInformation.IsOSPlatform(System.Runtime.InteropServices.OSPlatform.Windows))
{
    Console.Write("Hello World\r\n");
}
else
{
    Console.Write("Hello World\n");
}