Console.OpenStandardError Metode

Definisi

Ruang nama:

System

Rakitan:

netstandard.dll, System.Console.dll

Memperoleh aliran kesalahan standar.

Overload

Nama	Deskripsi
OpenStandardError()	Memperoleh aliran kesalahan standar.
OpenStandardError(Int32)	Memperoleh aliran kesalahan standar, yang diatur ke ukuran buffer tertentu.

OpenStandardError()

Sumber:

Console.cs

Memperoleh aliran kesalahan standar.

public:
 static System::IO::Stream ^ OpenStandardError();

public static System.IO.Stream OpenStandardError();

static member OpenStandardError : unit -> System.IO.Stream

Public Shared Function OpenStandardError () As Stream

Mengembalikan

Stream

Aliran kesalahan standar.

Contoh

Contoh berikut adalah penampil file teks sederhana yang menampilkan konten satu atau beberapa file teks ke konsol. Jika tidak ada argumen baris perintah, atau jika ada file yang diteruskan sebagai argumen baris perintah tidak ada, contoh memanggil SetError metode untuk mengalihkan informasi kesalahan ke file, memanggil OpenStandardError metode dalam proses memperoleh kembali aliran kesalahan standar, dan menunjukkan bahwa informasi kesalahan ditulis ke file.

using System;
using System.IO;

public class ViewTextFile
{
   public static void Main()
   {
      String[] args = Environment.GetCommandLineArgs();
      String errorOutput = "";
      // Make sure that there is at least one command line argument.
      if (args.Length <= 1)
         errorOutput += "You must include a filename on the command line.\n";

      for (int ctr = 1; ctr <= args.GetUpperBound(0); ctr++)  {
         // Check whether the file exists.
         if (!File.Exists(args[ctr])) {
            errorOutput += String.Format("'{0}' does not exist.\n", args[ctr]);
         }
         else {
            // Display the contents of the file.
            StreamReader sr = new StreamReader(args[ctr]);
            String contents = sr.ReadToEnd();
            sr.Close();
            Console.WriteLine("*****Contents of file '{0}':\n\n",
                              args[ctr]);
            Console.WriteLine(contents);
            Console.WriteLine("*****\n");
         }
      }

      // Check for error conditions.
      if (!String.IsNullOrEmpty(errorOutput)) {
         // Write error information to a file.
         Console.SetError(new StreamWriter(@".\ViewTextFile.Err.txt"));
         Console.Error.WriteLine(errorOutput);
         Console.Error.Close();
         // Reacquire the standard error stream.
         var standardError = new StreamWriter(Console.OpenStandardError());
         standardError.AutoFlush = true;
         Console.SetError(standardError);
         Console.Error.WriteLine("\nError information written to ViewTextFile.Err.txt");
      }
   }
}
// If the example is compiled and run with the following command line:
//     ViewTextFile file1.txt file2.txt
// and neither file1.txt nor file2.txt exist, it displays the
// following output:
//     Error information written to ViewTextFile.Err.txt
// and writes the following text to ViewTextFile.Err.txt:
//     'file1.txt' does not exist.
//     'file2.txt' does not exist.

open System
open System.IO

let args = Environment.GetCommandLineArgs()[1..]
let mutable errorOutput = ""
// Make sure that there is at least one command line argument.
if args.Length < 1 then
    errorOutput <- errorOutput + "You must include a filename on the command line.\n"

for file in args do
    // Check whether the file exists.
    if File.Exists file then
        errorOutput <- errorOutput + $"'{file}' does not exist.\n"
    else
        // Display the contents of the file.
        use sr = new StreamReader(file)
        let contents = sr.ReadToEnd()
        Console.WriteLine $"*****Contents of file '{file}':\n\n"
        Console.WriteLine contents
        Console.WriteLine "*****\n"

// Check for error conditions.
if not (String.IsNullOrEmpty errorOutput) then
    // Write error information to a file.
    Console.SetError(new StreamWriter(@".\ViewTextFile.Err.txt"))
    Console.Error.WriteLine errorOutput
    Console.Error.Close()
    // Reacquire the standard error stream.
    use standardError = new StreamWriter(Console.OpenStandardError())
    standardError.AutoFlush <- true
    Console.SetError standardError
    Console.Error.WriteLine "\nError information written to ViewTextFile.Err.txt"

// If the example is compiled and run with the following command line:
//     ViewTextFile file1.txt file2.txt
// and neither file1.txt nor file2.txt exist, it displays the
// following output:
//     Error information written to ViewTextFile.Err.txt
// and writes the following text to ViewTextFile.Err.txt:
//     'file1.txt' does not exist.
//     'file2.txt' does not exist.

Imports System.IO

Module ViewTextFile
   Public Sub Main()
      Dim args() As String = Environment.GetCommandLineArgs()
      Dim errorOutput As String = ""
      ' Make sure that there is at least one command line argument.
      If args.Length <= 1 Then
         errorOutput += "You must include a filename on the command line." +
                        vbCrLf
      End If
      
      For ctr As Integer = 1 To args.GetUpperBound(0)
         ' Check whether the file exists.
         If Not File.Exists(args(ctr)) Then
            errorOutput += String.Format("'{0}' does not exist.{1}",
                                         args(ctr), vbCrLf)
         Else
            ' Display the contents of the file.
            Dim sr As New StreamReader(args(ctr))
            Dim contents As String = sr.ReadToEnd()
            sr.Close()
            Console.WriteLine("***** Contents of file '{0}':{1}{1}",
                              args(ctr), vbCrLf)
            Console.WriteLine(contents)
            Console.WriteLine("*****{0}", vbCrLf)
         End If
      Next

      ' Check for error conditions.
      If Not String.IsNullOrEmpty(errorOutput) Then
         ' Write error information to a file.
         Console.SetError(New StreamWriter(".\ViewTextFile.Err.txt"))
         Console.Error.WriteLine(errorOutput)
         Console.Error.Close()
         ' Reacquire the standard error stream.
         Dim standardError As New StreamWriter(Console.OpenStandardError())
         standardError.AutoFlush = True
         Console.SetError(standardError)
         Console.Error.WriteLine("{0}Error information written to ViewTextFile.Err.txt",
                                 vbCrLf)
      End If
   End Sub
End Module
' If the example is compiled and run with the following command line:
'     ViewTextFile file1.txt file2.txt
' and neither file1.txt nor file2.txt exist, it displays the
' following output:
'     Error information written to ViewTextFile.Err.txt
' and writes the following text to ViewTextFile.Err.txt:
'     'file1.txt' does not exist.
'     'file2.txt' does not exist.

Perhatikan bahwa StreamWriter.AutoFlush properti diatur ke true sebelum memerlukan kembali aliran kesalahan. Ini memastikan bahwa output akan segera dikirim ke konsol daripada di-buffer.

Keterangan

Metode ini dapat digunakan untuk memperoleh kembali aliran kesalahan standar setelah diubah oleh SetError metode .

Lihat juga

• Error
• IsErrorRedirected
• SetError(TextWriter)

OpenStandardError(Int32)

Sumber:

Console.cs

Memperoleh aliran kesalahan standar, yang diatur ke ukuran buffer tertentu.

public:
 static System::IO::Stream ^ OpenStandardError(int bufferSize);

public static System.IO.Stream OpenStandardError(int bufferSize);

static member OpenStandardError : int -> System.IO.Stream

Public Shared Function OpenStandardError (bufferSize As Integer) As Stream

Parameter

bufferSize

Int32

Parameter ini tidak berpengaruh, tetapi nilainya harus lebih besar dari atau sama dengan nol.

Mengembalikan

Stream

Aliran kesalahan standar.

Pengecualian

ArgumentOutOfRangeException

bufferSize kurang dari atau sama dengan nol.

Keterangan

Metode ini dapat digunakan untuk memperoleh kembali aliran kesalahan standar setelah diubah oleh SetError metode .

Lihat juga

• Error
• IsErrorRedirected
• SetError(TextWriter)