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.NET Framework 3.5
System Namespace
Console Class
 Error Property
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This page is specific to
Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:
.NET Framework Class Library
Console..::.Error Property

Gets the standard error output stream.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
Visual Basic (Declaration)
Public Shared ReadOnly Property Error As TextWriter
Visual Basic (Usage)
Dim value As TextWriter

value = Console.Error
C#
public static TextWriter Error { get; }
Visual C++
public:
static property TextWriter^ Error {
    TextWriter^ get ();
}
JScript
public static function get Error () : TextWriter

Property Value

Type: System.IO..::.TextWriter
A TextWriter that represents the standard error output stream.

This property is set to the standard error stream by default. This property can be set to another stream with the SetError method.

The following code example illustrates the use of the Error property.

Visual Basic
Imports System.IO

Public Class ExpandTabs
   Private Const tabSize As Integer = 4
   Private Const usageText As String = "Usage: EXPANDTABSEX inputfile.txt outputfile.txt"

   Public Shared Function Main(args() As String) As Integer
      Dim writer As StreamWriter = Nothing
      Dim standardOutput As TextWriter = Console.Out

      If args.Length < 2 Then
         Console.WriteLine(usageText)
         Return 1
      End If

      Try
         writer = New StreamWriter(args(1))
         Console.SetOut(writer)
         Console.SetIn(New StreamReader(args(0)))
      Catch e As IOException
         Dim errorWriter As TextWriter = Console.Error
         errorWriter.WriteLine(e.Message)
         errorWriter.WriteLine(usageText)
         Return 1
      End Try
      Dim i As Integer
      i = Console.Read()
      While i <> -1 
         Dim c As Char = Convert.ToChar(i)
         If c = ControlChars.Tab Then
            Console.Write("".PadRight(tabSize, " "c))
         Else
            Console.Write(c)
         End If
         i = Console.Read()
      End While
      writer.Close()
      ' Recover the standard output stream so that a 
      ' completion message can be displayed.
      Console.SetOut(standardOutput)
      Console.WriteLine("EXPANDTABSEX has completed the processing of {0}.", args(0))
      Return 0
   End Function 'Main
End Class 'ExpandTabs
C#
public class ExpandTabs {
    private const int tabSize = 4;
    private const string usageText = "Usage: EXPANDTABSEX inputfile.txt outputfile.txt";
    public static int Main(string[] args) {
        StreamWriter writer = null;
        TextWriter standardOutput = Console.Out;

        if (args.Length < 2) {
            Console.WriteLine(usageText);
            return 1;
        }

        try {
            writer = new StreamWriter(args[1]);
            Console.SetOut(writer);
            Console.SetIn(new StreamReader(args[0]));
        }
        catch(IOException e) {
            TextWriter errorWriter = Console.Error;
            errorWriter.WriteLine(e.Message);
            errorWriter.WriteLine(usageText);
            return 1;            
        }
        int i;
        while ((i = Console.Read()) != -1) {
            char c = (char)i;
            if (c == '\t')
                Console.Write(("").PadRight(tabSize, ' '));
            else
                Console.Write(c);
        }
        writer.Close();
        // Recover the standard output stream so that a 
        // completion message can be displayed.
        Console.SetOut(standardOutput);
        Console.WriteLine("EXPANDTABSEX has completed the processing of {0}.", args[0]);
        return 0;
    }
}
Visual C++
int main()
{
   const int tabSize = 4;
   array<String^>^args = Environment::GetCommandLineArgs();
   String^ usageText = "Usage: EXPANDTABSEX inputfile.txt outputfile.txt";
   StreamWriter^ writer = nullptr;
   TextWriter^ standardOutput = Console::Out;
   if ( args->Length < 3 )
   {
      Console::WriteLine( usageText );
      return 1;
   }

   try
   {
      writer = gcnew StreamWriter( args[ 2 ] );
      Console::SetOut( writer );
      Console::SetIn( gcnew StreamReader( args[ 1 ] ) );
   }
   catch ( IOException^ e ) 
   {
      TextWriter^ errorWriter = Console::Error;
      errorWriter->WriteLine( e->Message );
      errorWriter->WriteLine( usageText );
      return 1;
   }

   int i;
   while ( (i = Console::Read()) != -1 )
   {
      Char c = (Char)i;
      if ( c == '\t' )
            Console::Write( ((String^)"")->PadRight( tabSize, ' ' ) );
      else
            Console::Write( c );
   }

   writer->Close();

   // Recover the standard output stream so that a 
   // completion message can be displayed.
   Console::SetOut( standardOutput );
   Console::WriteLine( "EXPANDTABSEX has completed the processing of {0}.", args[ 0 ] );
   return 0;
}

JScript
public class ExpandTabs {
    private static var tabSize : int = 4;
    private static var usageText : String  = "Usage: EXPANDTABSEX inputfile.txt outputfile.txt";
    public static function Main(args : String[]) : int {
        var writer : StreamWriter = null;
        var standardOutput : TextWriter = Console.Out;

        if (args.Length < 2) {
            Console.WriteLine(usageText);
            return 1;
        }

        try {
            writer = new StreamWriter(args[1]);
            Console.SetOut(writer);
            Console.SetIn(new StreamReader(args[0]));
        }
        catch(e : IOException) {
            var errorWriter : TextWriter = Console.Error;
            errorWriter.WriteLine(e.Message);
            errorWriter.WriteLine(usageText);
            return 1;            
        }
        var i : int;
        while ((i = Console.Read()) != -1) {
            var c : char = char(i);
            if (c == '\t')
                Console.Write(("").PadRight(tabSize, ' '));
            else
                Console.Write(c);
        }
        writer.Close();
        // Recover the standard output stream so that a 
        // completion message can be displayed.
        Console.SetOut(standardOutput);
        Console.WriteLine("EXPANDTABSEX has completed the processing of {0}.", args[0]);
        return 0;
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0
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