Console.OpenStandardError Method in C#
Last Updated :
06 May, 2019
This method is used to acquire a standard error stream. This method can be used to reacquire the standard error stream after it has been changed by the SetError method.
Syntax:
public static System.IO.Stream OpenStandardError ();
Returns: This method returns the standard error stream.
Example: The below code first checks for the string to be GeeksForGeeks and if not so then the program calls the SetError method to redirect error information to a file, calls the OpenStandardError method in the process of reacquiring the standard error stream, and indicates that error information was written to a file. The StreamWriter.AutoFlush property is set to true before reacquiring the error stream. This ensures that output will be sent to the console immediately rather than buffered.
using System;
using System.IO;
namespace GeeksforGeeks {
class GFG {
static void Main( string [] args)
{
Console.WriteLine( "Please Write GeeksForGeeks" );
string a;
a = Console.ReadLine();
if (!a.Equals( "GeeksForGeeks" )) {
Console.SetError( new StreamWriter( @".\Errorfile.txt" ));
Console.Error.WriteLine( "The String is not GeeksForGeeks" );
Console.Error.Close();
var standardError = new StreamWriter(Console.OpenStandardError());
standardError.AutoFlush = true ;
Console.SetError(standardError);
Console.Error.WriteLine( "\nError information written" +
" to Errorfile.txt" );
}
}
}
}
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Executing on Cmd:
Output File:
Reference:
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