Standard streams (stdin, stdout, and stderr) redirection detection

ConsoleRedirection.cs

using System;
using System.Runtime.InteropServices;

// http://stackoverflow.com/a/3453272/6682

static class ConsoleRedirection
{
    // http://msdn.microsoft.com/en-us/library/system.console.isinputredirected.aspx
    public static bool IsInputRedirected()     { return IsRedirected(StdHandle.Stdin);  }
    // http://msdn.microsoft.com/en-us/library/system.console.isoutputredirected.aspx
    public static bool IsOutputRedirected()    { return IsRedirected(StdHandle.Stdout); }
    // http://msdn.microsoft.com/en-us/library/system.console.iserrorredirected.aspx
    public static bool IsErrorRedirected()     { return IsRedirected(StdHandle.Stderr); }

    static bool IsRedirected(StdHandle handle) { return FileType.Char != GetFileType(GetStdHandle(handle)); }

    // ReSharper disable UnusedMember.Local
    enum FileType { Unknown, Disk, Char, Pipe }; // ReSharper restore UnusedMember.Local
    enum StdHandle { Stdin = -10, Stdout = -11, Stderr = -12 };
        
    [DllImport("kernel32.dll")] static extern FileType GetFileType(IntPtr hdl);
    [DllImport("kernel32.dll")] static extern IntPtr GetStdHandle(StdHandle std);
}