Console.OpenStandardError 方法

定義

命名空間:

System

組件:

System.Console.dll

擷取標準錯誤資料流。

多載

OpenStandardError()	擷取標準錯誤資料流。
OpenStandardError(Int32)	擷取標準錯誤資料流，設定為指定的緩衝區大小。

OpenStandardError()

來源:

Console.cs

擷取標準錯誤資料流。

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

傳回

Stream

標準錯誤資料流。

範例

下列範例是一個簡單的文字檔檢視器，其會將一或多個文字檔的內容顯示至主控台。 如果沒有命令列引數，或傳遞為命令列引數的任何檔案不存在，則此範例會呼叫 SetError 方法，將錯誤資訊重新導向至檔案、在重新取得標準錯誤資料流程的過程中呼叫 OpenStandardError 方法，並指出錯誤資訊已寫入檔案。

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.

請注意， StreamWriter.AutoFlush 屬性會在重新取得錯誤資料流程之前設定 true 為 。 這可確保輸出會立即傳送至主控台，而不是緩衝處理。

備註

此方法可用來在方法變更 SetError 標準錯誤資料流程之後重新取得。

另請參閱

• Error
• IsErrorRedirected
• SetError(TextWriter)

OpenStandardError(Int32)

來源:

Console.cs

擷取標準錯誤資料流，設定為指定的緩衝區大小。

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

參數

bufferSize

Int32

此參數沒有作用，但其值必須大於或等於零。

傳回

Stream

標準錯誤資料流。

例外狀況

ArgumentOutOfRangeException

bufferSize 小於或等於零。

備註

此方法可用來在方法變更 SetError 標準錯誤資料流程之後重新取得。

另請參閱

• Error
• IsErrorRedirected
• SetError(TextWriter)