Console.cs source code in C# .NET

                        
Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Console.cs / 1305376 / Console.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*==============================================================================
** 
** Class: Console 
**
** 
** Purpose: This class provides access to the standard input, standard output
**          and standard error streams.
**
** 
=============================================================================*/
namespace System { 
    using System; 
    using System.IO;
    using System.Text; 
    using System.Globalization;
    using System.Security.Permissions;
    using Microsoft.Win32;
    using System.Runtime.CompilerServices; 
    using System.Threading;
    using System.Runtime.InteropServices; 
    using Microsoft.Win32.SafeHandles; 
    using System.Runtime.ConstrainedExecution;
    using System.Runtime.Versioning; 
    using System.Diagnostics.Contracts;

    // Provides static fields for console input & output.  Use
    // Console.In for input from the standard input stream (stdin), 
    // Console.Out for output to stdout, and Console.Error
    // for output to stderr.  If any of those console streams are 
    // redirected from the command line, these streams will be redirected. 
    // A program can also redirect its own output or input with the
    // SetIn, SetOut, and SetError methods. 
    //
    // The distinction between Console.Out & Console.Error is useful
    // for programs that redirect output to a file or a pipe.  Note that
    // stdout & stderr can be output to different files at the same 
    // time from the DOS command line:
    // 
    // someProgram 1> out 2> err 
    //
    //Contains only static data.  Serializable attribute not required. 
    public static class Console
    {
        private const int _DefaultConsoleBufferSize = 256;
        private const short AltVKCode = 0x12; 

#if !FEATURE_PAL 
        private const int NumberLockVKCode = 0x90;  // virtual key code 
        private const int CapsLockVKCode = 0x14;
 
        // Beep range - see MSDN.
        private const int MinBeepFrequency = 37;
        private const int MaxBeepFrequency = 32767;
 
        // MSDN says console titles can be up to 64 KB in length.
        // But I get an exception if I use buffer lengths longer than 
        // ~24500 Unicode characters.  Oh well. 
        private const int MaxConsoleTitleLength = 24500;
#endif // !FEATURE_PAL 

        private static TextReader _in;
        private static TextWriter _out;
        private static TextWriter _error; 

        private static ConsoleCancelEventHandler _cancelCallbacks; 
        private static ControlCHooker _hooker; 

#if !FEATURE_PAL 
        // ReadLine & Read can't use this because they need to use ReadFile
        // to be able to handle redirected input.  We have to accept that
        // we will lose repeated keystrokes when someone switches from
        // calling ReadKey to calling Read or ReadLine.  Those methods should 
        // ideally flush this cache as well.
        [System.Security.SecurityCritical /*auto-generated*/] 
        private static Win32Native.InputRecord _cachedInputRecord; 

        // For ResetColor 
        private static bool _haveReadDefaultColors;
        private static byte _defaultColors;
#endif // !FEATURE_PAL
#if FEATURE_CODEPAGES_FILE    // if no codepages file then locked into default 
        private static bool _wasOutRedirected;
        private static bool _wasErrorRedirected; 
#endif 
        private static Encoding _inputEncoding;
        private static Encoding _outputEncoding; 

        // Private object for locking instead of locking on a public type for SQL reliability work.
        private static Object s_InternalSyncObject;
        private static Object InternalSyncObject { 
            get {
                Contract.Ensures(Contract.Result