Necromancing.
I usually just create a class, which I can wrap around main in an IDisposable.
So I can log the console output to a file without modifying the rest of the code.
That way, I have the output in both the console and for later reference in a text-file.
public class Program
{
public static async System.Threading.Tasks.Task Main(string[] args)
{
using (ConsoleOutputMultiplexer co = new ConsoleOutputMultiplexer())
{
// Do something here
System.Console.WriteLine("Hello Logfile and Console 1 !");
System.Console.WriteLine("Hello Logfile and Console 2 !");
System.Console.WriteLine("Hello Logfile and Console 3 !");
} // End Using co
System.Console.WriteLine(" --- Press any key to continue --- ");
System.Console.ReadKey();
await System.Threading.Tasks.Task.CompletedTask;
} // End Task Main
}
with
public class MultiTextWriter
: System.IO.TextWriter
{
protected System.Text.Encoding m_encoding;
protected System.Collections.Generic.IEnumerable<System.IO.TextWriter> m_writers;
public override System.Text.Encoding Encoding => this.m_encoding;
public override System.IFormatProvider FormatProvider
{
get
{
return base.FormatProvider;
}
}
public MultiTextWriter(System.Collections.Generic.IEnumerable<System.IO.TextWriter> textWriters, System.Text.Encoding encoding)
{
this.m_writers = textWriters;
this.m_encoding = encoding;
}
public MultiTextWriter(System.Collections.Generic.IEnumerable<System.IO.TextWriter> textWriters)
: this(textWriters, textWriters.GetEnumerator().Current.Encoding)
{ }
public MultiTextWriter(System.Text.Encoding enc, params System.IO.TextWriter[] textWriters)
: this((System.Collections.Generic.IEnumerable<System.IO.TextWriter>)textWriters, enc)
{ }
public MultiTextWriter(params System.IO.TextWriter[] textWriters)
: this((System.Collections.Generic.IEnumerable<System.IO.TextWriter>)textWriters)
{ }
public override void Flush()
{
foreach (System.IO.TextWriter thisWriter in this.m_writers)
{
thisWriter.Flush();
}
}
public async override System.Threading.Tasks.Task FlushAsync()
{
foreach (System.IO.TextWriter thisWriter in this.m_writers)
{
await thisWriter.FlushAsync();
}
await System.Threading.Tasks.Task.CompletedTask;
}
public override void Write(char[] buffer, int index, int count)
{
foreach (System.IO.TextWriter thisWriter in this.m_writers)
{
thisWriter.Write(buffer, index, count);
}
}
public override void Write(System.ReadOnlySpan<char> buffer)
{
foreach (System.IO.TextWriter thisWriter in this.m_writers)
{
thisWriter.Write(buffer);
}
}
public async override System.Threading.Tasks.Task WriteAsync(char[] buffer, int index, int count)
{
foreach (System.IO.TextWriter thisWriter in this.m_writers)
{
await thisWriter.WriteAsync(buffer, index, count);
}
await System.Threading.Tasks.Task.CompletedTask;
}
public async override System.Threading.Tasks.Task WriteAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default)
{
foreach (System.IO.TextWriter thisWriter in this.m_writers)
{
await thisWriter.WriteAsync(buffer, cancellationToken);
}
await System.Threading.Tasks.Task.CompletedTask;
}
protected override void Dispose(bool disposing)
{
foreach (System.IO.TextWriter thisWriter in this.m_writers)
{
thisWriter.Dispose();
}
}
public async override System.Threading.Tasks.ValueTask DisposeAsync()
{
foreach (System.IO.TextWriter thisWriter in this.m_writers)
{
await thisWriter.DisposeAsync();
}
await System.Threading.Tasks.Task.CompletedTask;
}
public override void Close()
{
foreach (System.IO.TextWriter thisWriter in this.m_writers)
{
thisWriter.Close();
}
} // End Sub Close
} // End Class MultiTextWriter
public class ConsoleOutputMultiplexer
: System.IDisposable
{
protected System.IO.TextWriter m_oldOut;
protected System.IO.FileStream m_logStream;
protected System.IO.StreamWriter m_logWriter;
protected MultiTextWriter m_multiPlexer;
public ConsoleOutputMultiplexer()
{
this.m_oldOut = System.Console.Out;
try
{
this.m_logStream = new System.IO.FileStream("./Redirect.txt", System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
this.m_logWriter = new System.IO.StreamWriter(this.m_logStream);
this.m_multiPlexer = new MultiTextWriter(this.m_oldOut.Encoding, this.m_oldOut, this.m_logWriter);
System.Console.SetOut(this.m_multiPlexer);
}
catch (System.Exception e)
{
System.Console.WriteLine("Cannot open Redirect.txt for writing");
System.Console.WriteLine(e.Message);
return;
}
} // End Constructor
void System.IDisposable.Dispose()
{
System.Console.SetOut(this.m_oldOut);
if (this.m_multiPlexer != null)
{
this.m_multiPlexer.Flush();
if (this.m_logStream != null)
this.m_logStream.Flush();
this.m_multiPlexer.Close();
}
if(this.m_logStream != null)
this.m_logStream.Close();
} // End Sub Dispose
} // End Class ConsoleOutputMultiplexer
