[C#] Windows で開いている全ての名前付きパイプを取得する

using System.IO;

foreach (var pipe in Directory.EnumerateFiles(@"\\.\pipe\"))
{
    Console.WriteLine(pipe);
}

using System.IO;
using System.IO.Pipes;
using System.Linq;

void Main()
{
    const string pipeName = "testpipe";

    Console.WriteLine(ExistsNamedPipe(pipeName)); // False

    // NamedPipe を開く
    using (new NamedPipeServerStream(pipeName))
    {
        Console.WriteLine(ExistsNamedPipe(pipeName)); // True
    }

    Console.WriteLine(ExistsNamedPipe(pipeName)); // false
}

static bool ExistsNamedPipe(string pipeName)
{
    return Directory.EnumerateFiles(@"\\.\pipe\")
        .Any(x => x.AsSpan(9).SequenceEqual(pipeName));
}