C#重定向标准输入到标准输出的代码

下面内容段是关于C#重定向标准输入到标准输出的内容，应该是对大伙也有好处。

using System;
using System.IO;
using System.Runtime.InteropServices;

namespace RobvanderWoude
{
class Tee
{
static int Main( string[] args )
{

#region Command Line Parsing

string filename = String.Empty;

if ( args.Length == 1 )
{
if ( args[0].IndexOf( "?" ) > -1 )
{
return WriteError( );
}
else
{
filename = args[0];
}
}
else
{
if ( args.Length > 1 )
{
return WriteError( "Too many command line arguments" );
}
else
{
return WriteError( );
}
}

#endregion

try
{
if ( ConsoleEx.InputRedirected )
{
int inputn;
string inputc;
StreamWriter file = new StreamWriter( filename, true );
do
{
inputn = Console.In.Read( );
if ( inputn != -1 )
{
inputc = Convert.ToChar( Convert.ToByte( inputn ) ).ToString( );
Console.Write( inputc );
file.Write( inputc );
}
} while ( inputn != -1 );
file.Close( );
}
return 0;
}
catch ( Exception e )
{
return WriteError( e.Message );
}
}

#region Redirection Detection

public static class ConsoleEx
{
public static bool OutputRedirected
{
get
{
return FileType.Char != GetFileType( GetStdHandle( StdHandle.Stdout ) );
}
}

public static bool InputRedirected
{
get
{
return FileType.Char != GetFileType( GetStdHandle( StdHandle.Stdin ) );
}
}

public static bool ErrorRedirected
{
get
{
return FileType.Char != GetFileType( GetStdHandle( StdHandle.Stderr ) );
}
}

private enum FileType { Unknown, Disk, Char, Pipe };
private enum StdHandle { Stdin = -10, Stdout = -11, Stderr = -12 };

[DllImport( "kernel32.dll" )]
private static extern FileType GetFileType( IntPtr hdl );

[DllImport( "kernel32.dll" )]
private static extern IntPtr GetStdHandle( StdHandle std );
}

#endregion

#region Error Handling

public static int WriteError( Exception e = null )
{
return WriteError( e == null ? null : e.Message );
}

public static int WriteError( string errorMessage )
{
Console.OpenStandardError( );
if ( string.IsNullOrEmpty( errorMessage ) == false )
{
Console.WriteLine( );
Console.ForegroundColor = ConsoleColor.Red;
Console.Write( "ERROR: " );
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine( errorMessage );
Console.ResetColor( );
}

Console.WriteLine( );
Console.WriteLine( "Tee, Version 1.02" );
Console.WriteLine( "Redirect Standard Input to Standard Output AND to a file" );
Console.WriteLine( );
Console.Write( "Usage: " );
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine( "TEE filename" );
Console.ResetColor( );
Console.WriteLine( );
Console.WriteLine( "Where: "filename" is the file the Standard Input will be appended to" );
Console.WriteLine( );
Console.Write( "Check for redirection by Hans Passant on " );
Console.ForegroundColor = ConsoleColor.DarkGray;
Console.WriteLine( "StackOverflow.com" );
Console.WriteLine( "/questions/3453220/how-to-detect-if-console-in-stdin-has-been-redirected" );
Console.ResetColor( );
Console.WriteLine( );
Console.WriteLine( "Written by Rob van der Woude" );
Console.OpenStandardOutput( );
return 1;
}

#endregion
}
}